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<span id="669"> 669</span>
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<span id="673"> 673</span>
<span id="674"> 674</span>
<span id="675"> 675</span>
<span id="676"> 676</span>
<span id="677"> 677</span>
<span id="678"> 678</span>
<span id="679"> 679</span>
<span id="680"> 680</span>
<span id="681"> 681</span>
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<span id="683"> 683</span>
<span id="684"> 684</span>
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<span id="686"> 686</span>
<span id="687"> 687</span>
<span id="688"> 688</span>
<span id="689"> 689</span>
<span id="690"> 690</span>
<span id="691"> 691</span>
<span id="692"> 692</span>
<span id="693"> 693</span>
<span id="694"> 694</span>
<span id="695"> 695</span>
<span id="696"> 696</span>
<span id="697"> 697</span>
<span id="698"> 698</span>
<span id="699"> 699</span>
<span id="700"> 700</span>
<span id="701"> 701</span>
<span id="702"> 702</span>
<span id="703"> 703</span>
<span id="704"> 704</span>
<span id="705"> 705</span>
<span id="706"> 706</span>
<span id="707"> 707</span>
<span id="708"> 708</span>
<span id="709"> 709</span>
<span id="710"> 710</span>
<span id="711"> 711</span>
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<span id="713"> 713</span>
<span id="714"> 714</span>
<span id="715"> 715</span>
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<span id="720"> 720</span>
<span id="721"> 721</span>
<span id="722"> 722</span>
<span id="723"> 723</span>
<span id="724"> 724</span>
<span id="725"> 725</span>
<span id="726"> 726</span>
<span id="727"> 727</span>
<span id="728"> 728</span>
<span id="729"> 729</span>
<span id="730"> 730</span>
<span id="731"> 731</span>
<span id="732"> 732</span>
<span id="733"> 733</span>
<span id="734"> 734</span>
<span id="735"> 735</span>
<span id="736"> 736</span>
<span id="737"> 737</span>
<span id="738"> 738</span>
<span id="739"> 739</span>
<span id="740"> 740</span>
<span id="741"> 741</span>
<span id="742"> 742</span>
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<span id="750"> 750</span>
<span id="751"> 751</span>
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<span id="755"> 755</span>
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<span id="760"> 760</span>
<span id="761"> 761</span>
<span id="762"> 762</span>
<span id="763"> 763</span>
<span id="764"> 764</span>
<span id="765"> 765</span>
<span id="766"> 766</span>
<span id="767"> 767</span>
<span id="768"> 768</span>
<span id="769"> 769</span>
<span id="770"> 770</span>
<span id="771"> 771</span>
<span id="772"> 772</span>
<span id="773"> 773</span>
<span id="774"> 774</span>
<span id="775"> 775</span>
<span id="776"> 776</span>
<span id="777"> 777</span>
<span id="778"> 778</span>
<span id="779"> 779</span>
<span id="780"> 780</span>
<span id="781"> 781</span>
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<span id="783"> 783</span>
<span id="784"> 784</span>
<span id="785"> 785</span>
<span id="786"> 786</span>
<span id="787"> 787</span>
<span id="788"> 788</span>
<span id="789"> 789</span>
<span id="790"> 790</span>
<span id="791"> 791</span>
<span id="792"> 792</span>
<span id="793"> 793</span>
<span id="794"> 794</span>
<span id="795"> 795</span>
<span id="796"> 796</span>
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<span id="799"> 799</span>
<span id="800"> 800</span>
<span id="801"> 801</span>
<span id="802"> 802</span>
<span id="803"> 803</span>
<span id="804"> 804</span>
<span id="805"> 805</span>
<span id="806"> 806</span>
<span id="807"> 807</span>
<span id="808"> 808</span>
<span id="809"> 809</span>
<span id="810"> 810</span>
<span id="811"> 811</span>
<span id="812"> 812</span>
<span id="813"> 813</span>
<span id="814"> 814</span>
<span id="815"> 815</span>
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<span id="817"> 817</span>
<span id="818"> 818</span>
<span id="819"> 819</span>
<span id="820"> 820</span>
<span id="821"> 821</span>
<span id="822"> 822</span>
<span id="823"> 823</span>
<span id="824"> 824</span>
<span id="825"> 825</span>
<span id="826"> 826</span>
<span id="827"> 827</span>
<span id="828"> 828</span>
<span id="829"> 829</span>
<span id="830"> 830</span>
<span id="831"> 831</span>
<span id="832"> 832</span>
<span id="833"> 833</span>
<span id="834"> 834</span>
<span id="835"> 835</span>
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<span id="837"> 837</span>
<span id="838"> 838</span>
<span id="839"> 839</span>
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<span id="842"> 842</span>
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<span id="845"> 845</span>
<span id="846"> 846</span>
<span id="847"> 847</span>
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<span id="851"> 851</span>
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<span id="868"> 868</span>
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<span id="870"> 870</span>
<span id="871"> 871</span>
<span id="872"> 872</span>
<span id="873"> 873</span>
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<span id="884"> 884</span>
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<span id="888"> 888</span>
<span id="889"> 889</span>
<span id="890"> 890</span>
<span id="891"> 891</span>
<span id="892"> 892</span>
<span id="893"> 893</span>
<span id="894"> 894</span>
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<span id="896"> 896</span>
<span id="897"> 897</span>
<span id="898"> 898</span>
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<span id="900"> 900</span>
<span id="901"> 901</span>
<span id="902"> 902</span>
<span id="903"> 903</span>
<span id="904"> 904</span>
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<span id="906"> 906</span>
<span id="907"> 907</span>
<span id="908"> 908</span>
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<span id="911"> 911</span>
<span id="912"> 912</span>
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<span id="925"> 925</span>
<span id="926"> 926</span>
<span id="927"> 927</span>
<span id="928"> 928</span>
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<span id="930"> 930</span>
<span id="931"> 931</span>
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<span id="934"> 934</span>
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<span id="943"> 943</span>
<span id="944"> 944</span>
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<span id="950"> 950</span>
<span id="951"> 951</span>
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<span id="970"> 970</span>
<span id="971"> 971</span>
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<span id="978"> 978</span>
<span id="979"> 979</span>
<span id="980"> 980</span>
<span id="981"> 981</span>
<span id="982"> 982</span>
<span id="983"> 983</span>
<span id="984"> 984</span>
<span id="985"> 985</span>
<span id="986"> 986</span>
<span id="987"> 987</span>
<span id="988"> 988</span>
<span id="989"> 989</span>
<span id="990"> 990</span>
<span id="991"> 991</span>
<span id="992"> 992</span>
<span id="993"> 993</span>
<span id="994"> 994</span>
<span id="995"> 995</span>
<span id="996"> 996</span>
<span id="997"> 997</span>
<span id="998"> 998</span>
<span id="999"> 999</span>
<span id="1000">1000</span>
<span id="1001">1001</span>
<span id="1002">1002</span>
<span id="1003">1003</span>
<span id="1004">1004</span>
<span id="1005">1005</span>
<span id="1006">1006</span>
<span id="1007">1007</span>
<span id="1008">1008</span>
<span id="1009">1009</span>
<span id="1010">1010</span>
<span id="1011">1011</span>
<span id="1012">1012</span>
<span id="1013">1013</span>
<span id="1014">1014</span>
<span id="1015">1015</span>
<span id="1016">1016</span>
<span id="1017">1017</span>
<span id="1018">1018</span>
<span id="1019">1019</span>
<span id="1020">1020</span>
<span id="1021">1021</span>
<span id="1022">1022</span>
<span id="1023">1023</span>
<span id="1024">1024</span>
<span id="1025">1025</span>
<span id="1026">1026</span>
<span id="1027">1027</span>
<span id="1028">1028</span>
<span id="1029">1029</span>
<span id="1030">1030</span>
<span id="1031">1031</span>
<span id="1032">1032</span>
<span id="1033">1033</span>
<span id="1034">1034</span>
<span id="1035">1035</span>
<span id="1036">1036</span>
<span id="1037">1037</span>
<span id="1038">1038</span>
<span id="1039">1039</span>
<span id="1040">1040</span>
<span id="1041">1041</span>
<span id="1042">1042</span>
<span id="1043">1043</span>
<span id="1044">1044</span>
<span id="1045">1045</span>
<span id="1046">1046</span>
<span id="1047">1047</span>
<span id="1048">1048</span>
<span id="1049">1049</span>
<span id="1050">1050</span>
<span id="1051">1051</span>
<span id="1052">1052</span>
<span id="1053">1053</span>
<span id="1054">1054</span>
<span id="1055">1055</span>
<span id="1056">1056</span>
<span id="1057">1057</span>
<span id="1058">1058</span>
<span id="1059">1059</span>
<span id="1060">1060</span>
<span id="1061">1061</span>
<span id="1062">1062</span>
<span id="1063">1063</span>
<span id="1064">1064</span>
<span id="1065">1065</span>
<span id="1066">1066</span>
<span id="1067">1067</span>
<span id="1068">1068</span>
<span id="1069">1069</span>
<span id="1070">1070</span>
<span id="1071">1071</span>
<span id="1072">1072</span>
<span id="1073">1073</span>
<span id="1074">1074</span>
<span id="1075">1075</span>
<span id="1076">1076</span>
<span id="1077">1077</span>
<span id="1078">1078</span>
<span id="1079">1079</span>
<span id="1080">1080</span>
<span id="1081">1081</span>
<span id="1082">1082</span>
<span id="1083">1083</span>
<span id="1084">1084</span>
<span id="1085">1085</span>
</pre><pre class="rust ">
<span class="comment">// This is a part of rust-chrono.</span>
<span class="comment">// Copyright (c) 2015, Kang Seonghoon.</span>
<span class="comment">// See README.md and LICENSE.txt for details.</span>

<span class="doccomment">//! A collection of parsed date and time items.</span>
<span class="doccomment">//! They can be constructed incrementally while being checked for consistency.</span>

<span class="kw">use</span> <span class="ident">num</span>::<span class="ident">traits</span>::<span class="ident">ToPrimitive</span>;

<span class="kw">use</span> {<span class="ident">Datelike</span>, <span class="ident">Timelike</span>};
<span class="kw">use</span> <span class="ident">Weekday</span>;
<span class="kw">use</span> <span class="ident">div</span>::<span class="ident">div_rem</span>;
<span class="kw">use</span> <span class="ident">duration</span>::<span class="ident">Duration</span>;
<span class="kw">use</span> <span class="ident">offset</span>::{<span class="ident">TimeZone</span>, <span class="ident">Offset</span>, <span class="ident">LocalResult</span>};
<span class="kw">use</span> <span class="ident">offset</span>::<span class="ident">fixed</span>::<span class="ident">FixedOffset</span>;
<span class="kw">use</span> <span class="ident">naive</span>::<span class="ident">date</span>::<span class="ident">NaiveDate</span>;
<span class="kw">use</span> <span class="ident">naive</span>::<span class="ident">time</span>::<span class="ident">NaiveTime</span>;
<span class="kw">use</span> <span class="ident">naive</span>::<span class="ident">datetime</span>::<span class="ident">NaiveDateTime</span>;
<span class="kw">use</span> <span class="ident">datetime</span>::<span class="ident">DateTime</span>;
<span class="kw">use</span> <span class="kw">super</span>::{<span class="ident">ParseResult</span>, <span class="ident">OUT_OF_RANGE</span>, <span class="ident">IMPOSSIBLE</span>, <span class="ident">NOT_ENOUGH</span>};

<span class="doccomment">/// Parsed parts of date and time. There are two classes of methods:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// - `set_*` methods try to set given field(s) while checking for the consistency.</span>
<span class="doccomment">///   It may or may not check for the range constraint immediately (for efficiency reasons).</span>
<span class="doccomment">///</span>
<span class="doccomment">/// - `to_*` methods try to make a concrete date and time value out of set fields.</span>
<span class="doccomment">///   It fully checks any remaining out-of-range conditions and inconsistent/impossible fields.</span>
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">missing_copy_implementations</span>)]</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>, <span class="ident">PartialEq</span>, <span class="ident">Debug</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Parsed</span> {
    <span class="doccomment">/// Year.</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// This can be negative unlike [`year_div_100`](#structfield.year_div_100)</span>
    <span class="doccomment">/// and [`year_mod_100`](#structfield.year_mod_100) fields.</span>
    <span class="kw">pub</span> <span class="ident">year</span>: <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">i32</span><span class="op">&gt;</span>,

    <span class="doccomment">/// Year divided by 100. Implies that the year is &gt;= 1 BCE when set.</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// Due to the common usage, if this field is missing but</span>
    <span class="doccomment">/// [`year_mod_100`](#structfield.year_mod_100) is present,</span>
    <span class="doccomment">/// it is inferred to 19 when `year_mod_100 &gt;= 70` and 20 otherwise.</span>
    <span class="kw">pub</span> <span class="ident">year_div_100</span>: <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">i32</span><span class="op">&gt;</span>,

    <span class="doccomment">/// Year modulo 100. Implies that the year is &gt;= 1 BCE when set.</span>
    <span class="kw">pub</span> <span class="ident">year_mod_100</span>: <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">i32</span><span class="op">&gt;</span>,

    <span class="doccomment">/// Year in the [ISO week date](../../naive/date/index.html#week-date).</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// This can be negative unlike [`isoyear_div_100`](#structfield.isoyear_div_100) and</span>
    <span class="doccomment">/// [`isoyear_mod_100`](#structfield.isoyear_mod_100) fields.</span>
    <span class="kw">pub</span> <span class="ident">isoyear</span>: <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">i32</span><span class="op">&gt;</span>,

    <span class="doccomment">/// Year in the [ISO week date](../../naive/date/index.html#week-date), divided by 100.</span>
    <span class="doccomment">/// Implies that the year is &gt;= 1 BCE when set.</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// Due to the common usage, if this field is missing but</span>
    <span class="doccomment">/// [`isoyear_mod_100`](#structfield.isoyear_mod_100) is present,</span>
    <span class="doccomment">/// it is inferred to 19 when `isoyear_mod_100 &gt;= 70` and 20 otherwise.</span>
    <span class="kw">pub</span> <span class="ident">isoyear_div_100</span>: <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">i32</span><span class="op">&gt;</span>,

    <span class="doccomment">/// Year in the [ISO week date](../../naive/date/index.html#week-date), modulo 100.</span>
    <span class="doccomment">/// Implies that the year is &gt;= 1 BCE when set.</span>
    <span class="kw">pub</span> <span class="ident">isoyear_mod_100</span>: <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">i32</span><span class="op">&gt;</span>,

    <span class="doccomment">/// Month (1--12).</span>
    <span class="kw">pub</span> <span class="ident">month</span>: <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">u32</span><span class="op">&gt;</span>,

    <span class="doccomment">/// Week number, where the week 1 starts at the first Sunday of January</span>
    <span class="doccomment">/// (0--53, 1--53 or 1--52 depending on the year).</span>
    <span class="kw">pub</span> <span class="ident">week_from_sun</span>: <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">u32</span><span class="op">&gt;</span>,

    <span class="doccomment">/// Week number, where the week 1 starts at the first Monday of January</span>
    <span class="doccomment">/// (0--53, 1--53 or 1--52 depending on the year).</span>
    <span class="kw">pub</span> <span class="ident">week_from_mon</span>: <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">u32</span><span class="op">&gt;</span>,

    <span class="doccomment">/// [ISO week number](../../naive/date/index.html#week-date)</span>
    <span class="doccomment">/// (1--52 or 1--53 depending on the year).</span>
    <span class="kw">pub</span> <span class="ident">isoweek</span>: <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">u32</span><span class="op">&gt;</span>,

    <span class="doccomment">/// Day of the week.</span>
    <span class="kw">pub</span> <span class="ident">weekday</span>: <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">Weekday</span><span class="op">&gt;</span>,

    <span class="doccomment">/// Day of the year (1--365 or 1--366 depending on the year).</span>
    <span class="kw">pub</span> <span class="ident">ordinal</span>: <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">u32</span><span class="op">&gt;</span>,

    <span class="doccomment">/// Day of the month (1--28, 1--29, 1--30 or 1--31 depending on the month).</span>
    <span class="kw">pub</span> <span class="ident">day</span>: <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">u32</span><span class="op">&gt;</span>,

    <span class="doccomment">/// Hour number divided by 12 (0--1). 0 indicates AM and 1 indicates PM.</span>
    <span class="kw">pub</span> <span class="ident">hour_div_12</span>: <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">u32</span><span class="op">&gt;</span>,

    <span class="doccomment">/// Hour number modulo 12 (0--11).</span>
    <span class="kw">pub</span> <span class="ident">hour_mod_12</span>: <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">u32</span><span class="op">&gt;</span>,

    <span class="doccomment">/// Minute number (0--59).</span>
    <span class="kw">pub</span> <span class="ident">minute</span>: <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">u32</span><span class="op">&gt;</span>,

    <span class="doccomment">/// Second number (0--60, accounting for leap seconds).</span>
    <span class="kw">pub</span> <span class="ident">second</span>: <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">u32</span><span class="op">&gt;</span>,

    <span class="doccomment">/// The number of nanoseconds since the whole second (0--999,999,999).</span>
    <span class="kw">pub</span> <span class="ident">nanosecond</span>: <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">u32</span><span class="op">&gt;</span>,

    <span class="doccomment">/// The number of non-leap seconds since the midnight UTC on January 1, 1970.</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// This can be off by one if [`second`](#structfield.second) is 60 (a leap second).</span>
    <span class="kw">pub</span> <span class="ident">timestamp</span>: <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">i64</span><span class="op">&gt;</span>,

    <span class="doccomment">/// Offset from the local time to UTC, in seconds.</span>
    <span class="kw">pub</span> <span class="ident">offset</span>: <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">i32</span><span class="op">&gt;</span>,
}

<span class="doccomment">/// Checks if `old` is either empty or has the same value to `new` (i.e. &quot;consistent&quot;),</span>
<span class="doccomment">/// and if it is empty, set `old` to `new` as well.</span>
<span class="kw">fn</span> <span class="ident">set_if_consistent</span><span class="op">&lt;</span><span class="ident">T</span>: <span class="ident">PartialEq</span><span class="op">&gt;</span>(<span class="ident">old</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span>, <span class="ident">new</span>: <span class="ident">T</span>) <span class="op">-&gt;</span> <span class="ident">ParseResult</span><span class="op">&lt;</span>()<span class="op">&gt;</span> {
    <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="kw-2">ref</span> <span class="ident">old</span>) <span class="op">=</span> <span class="kw-2">*</span><span class="ident">old</span> {
        <span class="kw">if</span> <span class="kw-2">*</span><span class="ident">old</span> <span class="op">==</span> <span class="ident">new</span> {<span class="prelude-val">Ok</span>(())} <span class="kw">else</span> {<span class="prelude-val">Err</span>(<span class="ident">IMPOSSIBLE</span>)}
    } <span class="kw">else</span> {
        <span class="kw-2">*</span><span class="ident">old</span> <span class="op">=</span> <span class="prelude-val">Some</span>(<span class="ident">new</span>);
        <span class="prelude-val">Ok</span>(())
    }
}

<span class="kw">impl</span> <span class="ident">Parsed</span> {
    <span class="doccomment">/// Returns the initial value of parsed parts.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>() <span class="op">-&gt;</span> <span class="ident">Parsed</span> {
        <span class="ident">Parsed</span> { <span class="ident">year</span>: <span class="prelude-val">None</span>, <span class="ident">year_div_100</span>: <span class="prelude-val">None</span>, <span class="ident">year_mod_100</span>: <span class="prelude-val">None</span>, <span class="ident">isoyear</span>: <span class="prelude-val">None</span>,
                 <span class="ident">isoyear_div_100</span>: <span class="prelude-val">None</span>, <span class="ident">isoyear_mod_100</span>: <span class="prelude-val">None</span>, <span class="ident">month</span>: <span class="prelude-val">None</span>,
                 <span class="ident">week_from_sun</span>: <span class="prelude-val">None</span>, <span class="ident">week_from_mon</span>: <span class="prelude-val">None</span>, <span class="ident">isoweek</span>: <span class="prelude-val">None</span>, <span class="ident">weekday</span>: <span class="prelude-val">None</span>,
                 <span class="ident">ordinal</span>: <span class="prelude-val">None</span>, <span class="ident">day</span>: <span class="prelude-val">None</span>, <span class="ident">hour_div_12</span>: <span class="prelude-val">None</span>, <span class="ident">hour_mod_12</span>: <span class="prelude-val">None</span>, <span class="ident">minute</span>: <span class="prelude-val">None</span>,
                 <span class="ident">second</span>: <span class="prelude-val">None</span>, <span class="ident">nanosecond</span>: <span class="prelude-val">None</span>, <span class="ident">timestamp</span>: <span class="prelude-val">None</span>, <span class="ident">offset</span>: <span class="prelude-val">None</span> }
    }

    <span class="doccomment">/// Tries to set the [`year`](#structfield.year) field from given value.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">set_year</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">value</span>: <span class="ident">i64</span>) <span class="op">-&gt;</span> <span class="ident">ParseResult</span><span class="op">&lt;</span>()<span class="op">&gt;</span> {
        <span class="ident">set_if_consistent</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">year</span>, <span class="macro">try</span><span class="macro">!</span>(<span class="ident">value</span>.<span class="ident">to_i32</span>().<span class="ident">ok_or</span>(<span class="ident">OUT_OF_RANGE</span>)))
    }

    <span class="doccomment">/// Tries to set the [`year_div_100`](#structfield.year_div_100) field from given value.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">set_year_div_100</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">value</span>: <span class="ident">i64</span>) <span class="op">-&gt;</span> <span class="ident">ParseResult</span><span class="op">&lt;</span>()<span class="op">&gt;</span> {
        <span class="kw">if</span> <span class="ident">value</span> <span class="op">&lt;</span> <span class="number">0</span> { <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">OUT_OF_RANGE</span>); }
        <span class="ident">set_if_consistent</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">year_div_100</span>, <span class="macro">try</span><span class="macro">!</span>(<span class="ident">value</span>.<span class="ident">to_i32</span>().<span class="ident">ok_or</span>(<span class="ident">OUT_OF_RANGE</span>)))
    }

    <span class="doccomment">/// Tries to set the [`year_mod_100`](#structfield.year_mod_100) field from given value.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">set_year_mod_100</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">value</span>: <span class="ident">i64</span>) <span class="op">-&gt;</span> <span class="ident">ParseResult</span><span class="op">&lt;</span>()<span class="op">&gt;</span> {
        <span class="kw">if</span> <span class="ident">value</span> <span class="op">&lt;</span> <span class="number">0</span> { <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">OUT_OF_RANGE</span>); }
        <span class="ident">set_if_consistent</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">year_mod_100</span>, <span class="macro">try</span><span class="macro">!</span>(<span class="ident">value</span>.<span class="ident">to_i32</span>().<span class="ident">ok_or</span>(<span class="ident">OUT_OF_RANGE</span>)))
    }

    <span class="doccomment">/// Tries to set the [`isoyear`](#structfield.isoyear) field from given value.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">set_isoyear</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">value</span>: <span class="ident">i64</span>) <span class="op">-&gt;</span> <span class="ident">ParseResult</span><span class="op">&lt;</span>()<span class="op">&gt;</span> {
        <span class="ident">set_if_consistent</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">isoyear</span>, <span class="macro">try</span><span class="macro">!</span>(<span class="ident">value</span>.<span class="ident">to_i32</span>().<span class="ident">ok_or</span>(<span class="ident">OUT_OF_RANGE</span>)))
    }

    <span class="doccomment">/// Tries to set the [`isoyear_div_100`](#structfield.isoyear_div_100) field from given value.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">set_isoyear_div_100</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">value</span>: <span class="ident">i64</span>) <span class="op">-&gt;</span> <span class="ident">ParseResult</span><span class="op">&lt;</span>()<span class="op">&gt;</span> {
        <span class="kw">if</span> <span class="ident">value</span> <span class="op">&lt;</span> <span class="number">0</span> { <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">OUT_OF_RANGE</span>); }
        <span class="ident">set_if_consistent</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">isoyear_div_100</span>, <span class="macro">try</span><span class="macro">!</span>(<span class="ident">value</span>.<span class="ident">to_i32</span>().<span class="ident">ok_or</span>(<span class="ident">OUT_OF_RANGE</span>)))
    }

    <span class="doccomment">/// Tries to set the [`isoyear_mod_100`](#structfield.isoyear_mod_100) field from given value.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">set_isoyear_mod_100</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">value</span>: <span class="ident">i64</span>) <span class="op">-&gt;</span> <span class="ident">ParseResult</span><span class="op">&lt;</span>()<span class="op">&gt;</span> {
        <span class="kw">if</span> <span class="ident">value</span> <span class="op">&lt;</span> <span class="number">0</span> { <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">OUT_OF_RANGE</span>); }
        <span class="ident">set_if_consistent</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">isoyear_mod_100</span>, <span class="macro">try</span><span class="macro">!</span>(<span class="ident">value</span>.<span class="ident">to_i32</span>().<span class="ident">ok_or</span>(<span class="ident">OUT_OF_RANGE</span>)))
    }

    <span class="doccomment">/// Tries to set the [`month`](#structfield.month) field from given value.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">set_month</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">value</span>: <span class="ident">i64</span>) <span class="op">-&gt;</span> <span class="ident">ParseResult</span><span class="op">&lt;</span>()<span class="op">&gt;</span> {
        <span class="ident">set_if_consistent</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">month</span>, <span class="macro">try</span><span class="macro">!</span>(<span class="ident">value</span>.<span class="ident">to_u32</span>().<span class="ident">ok_or</span>(<span class="ident">OUT_OF_RANGE</span>)))
    }

    <span class="doccomment">/// Tries to set the [`week_from_sun`](#structfield.week_from_sun) field from given value.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">set_week_from_sun</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">value</span>: <span class="ident">i64</span>) <span class="op">-&gt;</span> <span class="ident">ParseResult</span><span class="op">&lt;</span>()<span class="op">&gt;</span> {
        <span class="ident">set_if_consistent</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">week_from_sun</span>, <span class="macro">try</span><span class="macro">!</span>(<span class="ident">value</span>.<span class="ident">to_u32</span>().<span class="ident">ok_or</span>(<span class="ident">OUT_OF_RANGE</span>)))
    }

    <span class="doccomment">/// Tries to set the [`week_from_mon`](#structfield.week_from_mon) field from given value.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">set_week_from_mon</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">value</span>: <span class="ident">i64</span>) <span class="op">-&gt;</span> <span class="ident">ParseResult</span><span class="op">&lt;</span>()<span class="op">&gt;</span> {
        <span class="ident">set_if_consistent</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">week_from_mon</span>, <span class="macro">try</span><span class="macro">!</span>(<span class="ident">value</span>.<span class="ident">to_u32</span>().<span class="ident">ok_or</span>(<span class="ident">OUT_OF_RANGE</span>)))
    }

    <span class="doccomment">/// Tries to set the [`isoweek`](#structfield.isoweek) field from given value.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">set_isoweek</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">value</span>: <span class="ident">i64</span>) <span class="op">-&gt;</span> <span class="ident">ParseResult</span><span class="op">&lt;</span>()<span class="op">&gt;</span> {
        <span class="ident">set_if_consistent</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">isoweek</span>, <span class="macro">try</span><span class="macro">!</span>(<span class="ident">value</span>.<span class="ident">to_u32</span>().<span class="ident">ok_or</span>(<span class="ident">OUT_OF_RANGE</span>)))
    }

    <span class="doccomment">/// Tries to set the [`weekday`](#structfield.weekday) field from given value.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">set_weekday</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">value</span>: <span class="ident">Weekday</span>) <span class="op">-&gt;</span> <span class="ident">ParseResult</span><span class="op">&lt;</span>()<span class="op">&gt;</span> {
        <span class="ident">set_if_consistent</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">weekday</span>, <span class="ident">value</span>)
    }

    <span class="doccomment">/// Tries to set the [`ordinal`](#structfield.ordinal) field from given value.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">set_ordinal</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">value</span>: <span class="ident">i64</span>) <span class="op">-&gt;</span> <span class="ident">ParseResult</span><span class="op">&lt;</span>()<span class="op">&gt;</span> {
        <span class="ident">set_if_consistent</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">ordinal</span>, <span class="macro">try</span><span class="macro">!</span>(<span class="ident">value</span>.<span class="ident">to_u32</span>().<span class="ident">ok_or</span>(<span class="ident">OUT_OF_RANGE</span>)))
    }

    <span class="doccomment">/// Tries to set the [`day`](#structfield.day) field from given value.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">set_day</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">value</span>: <span class="ident">i64</span>) <span class="op">-&gt;</span> <span class="ident">ParseResult</span><span class="op">&lt;</span>()<span class="op">&gt;</span> {
        <span class="ident">set_if_consistent</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">day</span>, <span class="macro">try</span><span class="macro">!</span>(<span class="ident">value</span>.<span class="ident">to_u32</span>().<span class="ident">ok_or</span>(<span class="ident">OUT_OF_RANGE</span>)))
    }

    <span class="doccomment">/// Tries to set the [`hour_div_12`](#structfield.hour_div_12) field from given value.</span>
    <span class="doccomment">/// (`false` for AM, `true` for PM)</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">set_ampm</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">value</span>: <span class="ident">bool</span>) <span class="op">-&gt;</span> <span class="ident">ParseResult</span><span class="op">&lt;</span>()<span class="op">&gt;</span> {
        <span class="ident">set_if_consistent</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">hour_div_12</span>, <span class="kw">if</span> <span class="ident">value</span> {<span class="number">1</span>} <span class="kw">else</span> {<span class="number">0</span>})
    }

    <span class="doccomment">/// Tries to set the [`hour_mod_12`](#structfield.hour_mod_12) field from</span>
    <span class="doccomment">/// given hour number in 12-hour clocks.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">set_hour12</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">value</span>: <span class="ident">i64</span>) <span class="op">-&gt;</span> <span class="ident">ParseResult</span><span class="op">&lt;</span>()<span class="op">&gt;</span> {
        <span class="kw">if</span> <span class="ident">value</span> <span class="op">&lt;</span> <span class="number">1</span> <span class="op">||</span> <span class="ident">value</span> <span class="op">&gt;</span> <span class="number">12</span> { <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">OUT_OF_RANGE</span>); }
        <span class="ident">set_if_consistent</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">hour_mod_12</span>, <span class="ident">value</span> <span class="kw">as</span> <span class="ident">u32</span> <span class="op">%</span> <span class="number">12</span>)
    }

    <span class="doccomment">/// Tries to set both [`hour_div_12`](#structfield.hour_div_12) and</span>
    <span class="doccomment">/// [`hour_mod_12`](#structfield.hour_mod_12) fields from given value.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">set_hour</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">value</span>: <span class="ident">i64</span>) <span class="op">-&gt;</span> <span class="ident">ParseResult</span><span class="op">&lt;</span>()<span class="op">&gt;</span> {
        <span class="kw">let</span> <span class="ident">v</span> <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(<span class="ident">value</span>.<span class="ident">to_u32</span>().<span class="ident">ok_or</span>(<span class="ident">OUT_OF_RANGE</span>));
        <span class="macro">try</span><span class="macro">!</span>(<span class="ident">set_if_consistent</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">hour_div_12</span>, <span class="ident">v</span> <span class="op">/</span> <span class="number">12</span>));
        <span class="macro">try</span><span class="macro">!</span>(<span class="ident">set_if_consistent</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">hour_mod_12</span>, <span class="ident">v</span> <span class="op">%</span> <span class="number">12</span>));
        <span class="prelude-val">Ok</span>(())
    }

    <span class="doccomment">/// Tries to set the [`minute`](#structfield.minute) field from given value.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">set_minute</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">value</span>: <span class="ident">i64</span>) <span class="op">-&gt;</span> <span class="ident">ParseResult</span><span class="op">&lt;</span>()<span class="op">&gt;</span> {
        <span class="ident">set_if_consistent</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">minute</span>, <span class="macro">try</span><span class="macro">!</span>(<span class="ident">value</span>.<span class="ident">to_u32</span>().<span class="ident">ok_or</span>(<span class="ident">OUT_OF_RANGE</span>)))
    }

    <span class="doccomment">/// Tries to set the [`second`](#structfield.second) field from given value.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">set_second</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">value</span>: <span class="ident">i64</span>) <span class="op">-&gt;</span> <span class="ident">ParseResult</span><span class="op">&lt;</span>()<span class="op">&gt;</span> {
        <span class="ident">set_if_consistent</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">second</span>, <span class="macro">try</span><span class="macro">!</span>(<span class="ident">value</span>.<span class="ident">to_u32</span>().<span class="ident">ok_or</span>(<span class="ident">OUT_OF_RANGE</span>)))
    }

    <span class="doccomment">/// Tries to set the [`nanosecond`](#structfield.nanosecond) field from given value.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">set_nanosecond</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">value</span>: <span class="ident">i64</span>) <span class="op">-&gt;</span> <span class="ident">ParseResult</span><span class="op">&lt;</span>()<span class="op">&gt;</span> {
        <span class="ident">set_if_consistent</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">nanosecond</span>, <span class="macro">try</span><span class="macro">!</span>(<span class="ident">value</span>.<span class="ident">to_u32</span>().<span class="ident">ok_or</span>(<span class="ident">OUT_OF_RANGE</span>)))
    }

    <span class="doccomment">/// Tries to set the [`timestamp`](#structfield.timestamp) field from given value.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">set_timestamp</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">value</span>: <span class="ident">i64</span>) <span class="op">-&gt;</span> <span class="ident">ParseResult</span><span class="op">&lt;</span>()<span class="op">&gt;</span> {
        <span class="ident">set_if_consistent</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">timestamp</span>, <span class="ident">value</span>)
    }

    <span class="doccomment">/// Tries to set the [`offset`](#structfield.offset) field from given value.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">set_offset</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">value</span>: <span class="ident">i64</span>) <span class="op">-&gt;</span> <span class="ident">ParseResult</span><span class="op">&lt;</span>()<span class="op">&gt;</span> {
        <span class="ident">set_if_consistent</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">offset</span>, <span class="macro">try</span><span class="macro">!</span>(<span class="ident">value</span>.<span class="ident">to_i32</span>().<span class="ident">ok_or</span>(<span class="ident">OUT_OF_RANGE</span>)))
    }

    <span class="doccomment">/// Returns a parsed naive date out of given fields.</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// This method is able to determine the date from given subset of fields:</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// - Year, month, day.</span>
    <span class="doccomment">/// - Year, day of the year (ordinal).</span>
    <span class="doccomment">/// - Year, week number counted from Sunday or Monday, day of the week.</span>
    <span class="doccomment">/// - ISO week date.</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// Gregorian year and ISO week date year can have their century number (`*_div_100`) omitted,</span>
    <span class="doccomment">/// the two-digit year is used to guess the century number then.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">to_naive_date</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">ParseResult</span><span class="op">&lt;</span><span class="ident">NaiveDate</span><span class="op">&gt;</span> {
        <span class="kw">fn</span> <span class="ident">resolve_year</span>(<span class="ident">y</span>: <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">i32</span><span class="op">&gt;</span>, <span class="ident">q</span>: <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">i32</span><span class="op">&gt;</span>,
                        <span class="ident">r</span>: <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">i32</span><span class="op">&gt;</span>) <span class="op">-&gt;</span> <span class="ident">ParseResult</span><span class="op">&lt;</span><span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">i32</span><span class="op">&gt;&gt;</span> {
            <span class="kw">match</span> (<span class="ident">y</span>, <span class="ident">q</span>, <span class="ident">r</span>) {
                <span class="comment">// if there is no further information, simply return the given full year.</span>
                <span class="comment">// this is a common case, so let&#39;s avoid division here.</span>
                (<span class="ident">y</span>, <span class="prelude-val">None</span>, <span class="prelude-val">None</span>) <span class="op">=&gt;</span> <span class="prelude-val">Ok</span>(<span class="ident">y</span>),

                <span class="comment">// if there is a full year *and* also quotient and/or modulo,</span>
                <span class="comment">// check if present quotient and/or modulo is consistent to the full year.</span>
                <span class="comment">// since the presence of those fields means a positive full year,</span>
                <span class="comment">// we should filter a negative full year first.</span>
                (<span class="prelude-val">Some</span>(<span class="ident">y</span>), <span class="ident">q</span>, <span class="ident">r</span> @ <span class="prelude-val">Some</span>(<span class="number">0</span>...<span class="number">99</span>)) <span class="op">|</span> (<span class="prelude-val">Some</span>(<span class="ident">y</span>), <span class="ident">q</span>, <span class="ident">r</span> @ <span class="prelude-val">None</span>) <span class="op">=&gt;</span> {
                    <span class="kw">if</span> <span class="ident">y</span> <span class="op">&lt;</span> <span class="number">0</span> { <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">OUT_OF_RANGE</span>); }
                    <span class="kw">let</span> (<span class="ident">q_</span>, <span class="ident">r_</span>) <span class="op">=</span> <span class="ident">div_rem</span>(<span class="ident">y</span>, <span class="number">100</span>);
                    <span class="kw">if</span> <span class="ident">q</span>.<span class="ident">unwrap_or</span>(<span class="ident">q_</span>) <span class="op">==</span> <span class="ident">q_</span> <span class="op">&amp;&amp;</span> <span class="ident">r</span>.<span class="ident">unwrap_or</span>(<span class="ident">r_</span>) <span class="op">==</span> <span class="ident">r_</span> {
                        <span class="prelude-val">Ok</span>(<span class="prelude-val">Some</span>(<span class="ident">y</span>))
                    } <span class="kw">else</span> {
                        <span class="prelude-val">Err</span>(<span class="ident">IMPOSSIBLE</span>)
                    }
                },

                <span class="comment">// the full year is missing but we have quotient and modulo.</span>
                <span class="comment">// reconstruct the full year. make sure that the result is always positive.</span>
                (<span class="prelude-val">None</span>, <span class="prelude-val">Some</span>(<span class="ident">q</span>), <span class="prelude-val">Some</span>(<span class="ident">r</span> @ <span class="number">0</span>...<span class="number">99</span>)) <span class="op">=&gt;</span> {
                    <span class="kw">if</span> <span class="ident">q</span> <span class="op">&lt;</span> <span class="number">0</span> { <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">OUT_OF_RANGE</span>); }
                    <span class="kw">let</span> <span class="ident">y</span> <span class="op">=</span> <span class="ident">q</span>.<span class="ident">checked_mul</span>(<span class="number">100</span>).<span class="ident">and_then</span>(<span class="op">|</span><span class="ident">v</span><span class="op">|</span> <span class="ident">v</span>.<span class="ident">checked_add</span>(<span class="ident">r</span>));
                    <span class="prelude-val">Ok</span>(<span class="prelude-val">Some</span>(<span class="macro">try</span><span class="macro">!</span>(<span class="ident">y</span>.<span class="ident">ok_or</span>(<span class="ident">OUT_OF_RANGE</span>))))
                },

                <span class="comment">// we only have modulo. try to interpret a modulo as a conventional two-digit year.</span>
                <span class="comment">// note: we are affected by Rust issue #18060. avoid multiple range patterns.</span>
                (<span class="prelude-val">None</span>, <span class="prelude-val">None</span>, <span class="prelude-val">Some</span>(<span class="ident">r</span> @ <span class="number">0</span>...<span class="number">99</span>)) <span class="op">=&gt;</span> <span class="prelude-val">Ok</span>(<span class="prelude-val">Some</span>(<span class="ident">r</span> <span class="op">+</span> <span class="kw">if</span> <span class="ident">r</span> <span class="op">&lt;</span> <span class="number">70</span> {<span class="number">2000</span>} <span class="kw">else</span> {<span class="number">1900</span>})),

                <span class="comment">// otherwise it is an out-of-bound or insufficient condition.</span>
                (<span class="prelude-val">None</span>, <span class="prelude-val">Some</span>(_), <span class="prelude-val">None</span>) <span class="op">=&gt;</span> <span class="prelude-val">Err</span>(<span class="ident">NOT_ENOUGH</span>),
                (_, _, <span class="prelude-val">Some</span>(_)) <span class="op">=&gt;</span> <span class="prelude-val">Err</span>(<span class="ident">OUT_OF_RANGE</span>),
            }
        }

        <span class="kw">let</span> <span class="ident">given_year</span> <span class="op">=</span>
            <span class="macro">try</span><span class="macro">!</span>(<span class="ident">resolve_year</span>(<span class="self">self</span>.<span class="ident">year</span>, <span class="self">self</span>.<span class="ident">year_div_100</span>, <span class="self">self</span>.<span class="ident">year_mod_100</span>));
        <span class="kw">let</span> <span class="ident">given_isoyear</span> <span class="op">=</span>
            <span class="macro">try</span><span class="macro">!</span>(<span class="ident">resolve_year</span>(<span class="self">self</span>.<span class="ident">isoyear</span>, <span class="self">self</span>.<span class="ident">isoyear_div_100</span>, <span class="self">self</span>.<span class="ident">isoyear_mod_100</span>));

        <span class="comment">// verify the normal year-month-day date.</span>
        <span class="kw">let</span> <span class="ident">verify_ymd</span> <span class="op">=</span> <span class="op">|</span><span class="ident">date</span>: <span class="ident">NaiveDate</span><span class="op">|</span> {
            <span class="kw">let</span> <span class="ident">year</span> <span class="op">=</span> <span class="ident">date</span>.<span class="ident">year</span>();
            <span class="kw">let</span> (<span class="ident">year_div_100</span>, <span class="ident">year_mod_100</span>) <span class="op">=</span> <span class="kw">if</span> <span class="ident">year</span> <span class="op">&gt;=</span> <span class="number">0</span> {
                <span class="kw">let</span> (<span class="ident">q</span>, <span class="ident">r</span>) <span class="op">=</span> <span class="ident">div_rem</span>(<span class="ident">year</span>, <span class="number">100</span>);
                (<span class="prelude-val">Some</span>(<span class="ident">q</span>), <span class="prelude-val">Some</span>(<span class="ident">r</span>))
            } <span class="kw">else</span> {
                (<span class="prelude-val">None</span>, <span class="prelude-val">None</span>) <span class="comment">// they should be empty to be consistent</span>
            };
            <span class="kw">let</span> <span class="ident">month</span> <span class="op">=</span> <span class="ident">date</span>.<span class="ident">month</span>();
            <span class="kw">let</span> <span class="ident">day</span> <span class="op">=</span> <span class="ident">date</span>.<span class="ident">day</span>();
            (<span class="self">self</span>.<span class="ident">year</span>.<span class="ident">unwrap_or</span>(<span class="ident">year</span>) <span class="op">==</span> <span class="ident">year</span> <span class="op">&amp;&amp;</span>
             <span class="self">self</span>.<span class="ident">year_div_100</span>.<span class="ident">or</span>(<span class="ident">year_div_100</span>) <span class="op">==</span> <span class="ident">year_div_100</span> <span class="op">&amp;&amp;</span>
             <span class="self">self</span>.<span class="ident">year_mod_100</span>.<span class="ident">or</span>(<span class="ident">year_mod_100</span>) <span class="op">==</span> <span class="ident">year_mod_100</span> <span class="op">&amp;&amp;</span>
             <span class="self">self</span>.<span class="ident">month</span>.<span class="ident">unwrap_or</span>(<span class="ident">month</span>) <span class="op">==</span> <span class="ident">month</span> <span class="op">&amp;&amp;</span>
             <span class="self">self</span>.<span class="ident">day</span>.<span class="ident">unwrap_or</span>(<span class="ident">day</span>) <span class="op">==</span> <span class="ident">day</span>)
        };

        <span class="comment">// verify the ISO week date.</span>
        <span class="kw">let</span> <span class="ident">verify_isoweekdate</span> <span class="op">=</span> <span class="op">|</span><span class="ident">date</span>: <span class="ident">NaiveDate</span><span class="op">|</span> {
            <span class="kw">let</span> (<span class="ident">isoyear</span>, <span class="ident">isoweek</span>, <span class="ident">weekday</span>) <span class="op">=</span> <span class="ident">date</span>.<span class="ident">isoweekdate</span>();
            <span class="kw">let</span> (<span class="ident">isoyear_div_100</span>, <span class="ident">isoyear_mod_100</span>) <span class="op">=</span> <span class="kw">if</span> <span class="ident">isoyear</span> <span class="op">&gt;=</span> <span class="number">0</span> {
                <span class="kw">let</span> (<span class="ident">q</span>, <span class="ident">r</span>) <span class="op">=</span> <span class="ident">div_rem</span>(<span class="ident">isoyear</span>, <span class="number">100</span>);
                (<span class="prelude-val">Some</span>(<span class="ident">q</span>), <span class="prelude-val">Some</span>(<span class="ident">r</span>))
            } <span class="kw">else</span> {
                (<span class="prelude-val">None</span>, <span class="prelude-val">None</span>) <span class="comment">// they should be empty to be consistent</span>
            };
            (<span class="self">self</span>.<span class="ident">isoyear</span>.<span class="ident">unwrap_or</span>(<span class="ident">isoyear</span>) <span class="op">==</span> <span class="ident">isoyear</span> <span class="op">&amp;&amp;</span>
             <span class="self">self</span>.<span class="ident">isoyear_div_100</span>.<span class="ident">or</span>(<span class="ident">isoyear_div_100</span>) <span class="op">==</span> <span class="ident">isoyear_div_100</span> <span class="op">&amp;&amp;</span>
             <span class="self">self</span>.<span class="ident">isoyear_mod_100</span>.<span class="ident">or</span>(<span class="ident">isoyear_mod_100</span>) <span class="op">==</span> <span class="ident">isoyear_mod_100</span> <span class="op">&amp;&amp;</span>
             <span class="self">self</span>.<span class="ident">isoweek</span>.<span class="ident">unwrap_or</span>(<span class="ident">isoweek</span>) <span class="op">==</span> <span class="ident">isoweek</span> <span class="op">&amp;&amp;</span>
             <span class="self">self</span>.<span class="ident">weekday</span>.<span class="ident">unwrap_or</span>(<span class="ident">weekday</span>) <span class="op">==</span> <span class="ident">weekday</span>)
        };

        <span class="comment">// verify the ordinal and other (non-ISO) week dates.</span>
        <span class="kw">let</span> <span class="ident">verify_ordinal</span> <span class="op">=</span> <span class="op">|</span><span class="ident">date</span>: <span class="ident">NaiveDate</span><span class="op">|</span> {
            <span class="kw">let</span> <span class="ident">ordinal</span> <span class="op">=</span> <span class="ident">date</span>.<span class="ident">ordinal</span>();
            <span class="kw">let</span> <span class="ident">weekday</span> <span class="op">=</span> <span class="ident">date</span>.<span class="ident">weekday</span>();
            <span class="kw">let</span> <span class="ident">week_from_sun</span> <span class="op">=</span> (<span class="ident">ordinal</span> <span class="kw">as</span> <span class="ident">i32</span> <span class="op">-</span> <span class="ident">weekday</span>.<span class="ident">num_days_from_sunday</span>() <span class="kw">as</span> <span class="ident">i32</span> <span class="op">+</span> <span class="number">7</span>) <span class="op">/</span> <span class="number">7</span>;
            <span class="kw">let</span> <span class="ident">week_from_mon</span> <span class="op">=</span> (<span class="ident">ordinal</span> <span class="kw">as</span> <span class="ident">i32</span> <span class="op">-</span> <span class="ident">weekday</span>.<span class="ident">num_days_from_monday</span>() <span class="kw">as</span> <span class="ident">i32</span> <span class="op">+</span> <span class="number">7</span>) <span class="op">/</span> <span class="number">7</span>;
            (<span class="self">self</span>.<span class="ident">ordinal</span>.<span class="ident">unwrap_or</span>(<span class="ident">ordinal</span>) <span class="op">==</span> <span class="ident">ordinal</span> <span class="op">&amp;&amp;</span>
             <span class="self">self</span>.<span class="ident">week_from_sun</span>.<span class="ident">map_or</span>(<span class="ident">week_from_sun</span>, <span class="op">|</span><span class="ident">v</span><span class="op">|</span> <span class="ident">v</span> <span class="kw">as</span> <span class="ident">i32</span>) <span class="op">==</span> <span class="ident">week_from_sun</span> <span class="op">&amp;&amp;</span>
             <span class="self">self</span>.<span class="ident">week_from_mon</span>.<span class="ident">map_or</span>(<span class="ident">week_from_mon</span>, <span class="op">|</span><span class="ident">v</span><span class="op">|</span> <span class="ident">v</span> <span class="kw">as</span> <span class="ident">i32</span>) <span class="op">==</span> <span class="ident">week_from_mon</span>)
        };

        <span class="comment">// test several possibilities.</span>
        <span class="comment">// tries to construct a full `NaiveDate` as much as possible, then verifies that</span>
        <span class="comment">// it is consistent with other given fields.</span>
        <span class="kw">let</span> (<span class="ident">verified</span>, <span class="ident">parsed_date</span>) <span class="op">=</span> <span class="kw">match</span> (<span class="ident">given_year</span>, <span class="ident">given_isoyear</span>, <span class="self">self</span>) {
            (<span class="prelude-val">Some</span>(<span class="ident">year</span>), _, <span class="kw-2">&amp;</span><span class="ident">Parsed</span> { <span class="ident">month</span>: <span class="prelude-val">Some</span>(<span class="ident">month</span>), <span class="ident">day</span>: <span class="prelude-val">Some</span>(<span class="ident">day</span>), .. }) <span class="op">=&gt;</span> {
                <span class="comment">// year, month, day</span>
                <span class="kw">let</span> <span class="ident">date</span> <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(<span class="ident">NaiveDate</span>::<span class="ident">from_ymd_opt</span>(<span class="ident">year</span>, <span class="ident">month</span>, <span class="ident">day</span>).<span class="ident">ok_or</span>(<span class="ident">OUT_OF_RANGE</span>));
                (<span class="ident">verify_isoweekdate</span>(<span class="ident">date</span>) <span class="op">&amp;&amp;</span> <span class="ident">verify_ordinal</span>(<span class="ident">date</span>), <span class="ident">date</span>)
            },

            (<span class="prelude-val">Some</span>(<span class="ident">year</span>), _, <span class="kw-2">&amp;</span><span class="ident">Parsed</span> { <span class="ident">ordinal</span>: <span class="prelude-val">Some</span>(<span class="ident">ordinal</span>), .. }) <span class="op">=&gt;</span> {
                <span class="comment">// year, day of the year</span>
                <span class="kw">let</span> <span class="ident">date</span> <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(<span class="ident">NaiveDate</span>::<span class="ident">from_yo_opt</span>(<span class="ident">year</span>, <span class="ident">ordinal</span>).<span class="ident">ok_or</span>(<span class="ident">OUT_OF_RANGE</span>));
                (<span class="ident">verify_ymd</span>(<span class="ident">date</span>) <span class="op">&amp;&amp;</span> <span class="ident">verify_isoweekdate</span>(<span class="ident">date</span>) <span class="op">&amp;&amp;</span> <span class="ident">verify_ordinal</span>(<span class="ident">date</span>), <span class="ident">date</span>)
            },

            (<span class="prelude-val">Some</span>(<span class="ident">year</span>), _, <span class="kw-2">&amp;</span><span class="ident">Parsed</span> { <span class="ident">week_from_sun</span>: <span class="prelude-val">Some</span>(<span class="ident">week_from_sun</span>),
                                      <span class="ident">weekday</span>: <span class="prelude-val">Some</span>(<span class="ident">weekday</span>), .. }) <span class="op">=&gt;</span> {
                <span class="comment">// year, week (starting at 1st Sunday), day of the week</span>
                <span class="kw">let</span> <span class="ident">newyear</span> <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(<span class="ident">NaiveDate</span>::<span class="ident">from_yo_opt</span>(<span class="ident">year</span>, <span class="number">1</span>).<span class="ident">ok_or</span>(<span class="ident">OUT_OF_RANGE</span>));
                <span class="kw">let</span> <span class="ident">firstweek</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">newyear</span>.<span class="ident">weekday</span>() {
                    <span class="ident">Weekday</span>::<span class="ident">Sun</span> <span class="op">=&gt;</span> <span class="number">0</span>,
                    <span class="ident">Weekday</span>::<span class="ident">Mon</span> <span class="op">=&gt;</span> <span class="number">6</span>,
                    <span class="ident">Weekday</span>::<span class="ident">Tue</span> <span class="op">=&gt;</span> <span class="number">5</span>,
                    <span class="ident">Weekday</span>::<span class="ident">Wed</span> <span class="op">=&gt;</span> <span class="number">4</span>,
                    <span class="ident">Weekday</span>::<span class="ident">Thu</span> <span class="op">=&gt;</span> <span class="number">3</span>,
                    <span class="ident">Weekday</span>::<span class="ident">Fri</span> <span class="op">=&gt;</span> <span class="number">2</span>,
                    <span class="ident">Weekday</span>::<span class="ident">Sat</span> <span class="op">=&gt;</span> <span class="number">1</span>,
                };

                <span class="comment">// `firstweek+1`-th day of January is the beginning of the week 1.</span>
                <span class="kw">if</span> <span class="ident">week_from_sun</span> <span class="op">&gt;</span> <span class="number">53</span> { <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">OUT_OF_RANGE</span>); } <span class="comment">// can it overflow?</span>
                <span class="kw">let</span> <span class="ident">ndays</span> <span class="op">=</span> <span class="ident">firstweek</span> <span class="op">+</span> (<span class="ident">week_from_sun</span> <span class="kw">as</span> <span class="ident">i32</span> <span class="op">-</span> <span class="number">1</span>) <span class="op">*</span> <span class="number">7</span> <span class="op">+</span>
                            <span class="ident">weekday</span>.<span class="ident">num_days_from_sunday</span>() <span class="kw">as</span> <span class="ident">i32</span>;
                <span class="kw">let</span> <span class="ident">date</span> <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(<span class="ident">newyear</span>.<span class="ident">checked_add</span>(<span class="ident">Duration</span>::<span class="ident">days</span>(<span class="ident">ndays</span> <span class="kw">as</span> <span class="ident">i64</span>))
                                       .<span class="ident">ok_or</span>(<span class="ident">OUT_OF_RANGE</span>));
                <span class="kw">if</span> <span class="ident">date</span>.<span class="ident">year</span>() <span class="op">!=</span> <span class="ident">year</span> { <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">OUT_OF_RANGE</span>); } <span class="comment">// early exit for correct error</span>

                (<span class="ident">verify_ymd</span>(<span class="ident">date</span>) <span class="op">&amp;&amp;</span> <span class="ident">verify_isoweekdate</span>(<span class="ident">date</span>) <span class="op">&amp;&amp;</span> <span class="ident">verify_ordinal</span>(<span class="ident">date</span>), <span class="ident">date</span>)
            },

            (<span class="prelude-val">Some</span>(<span class="ident">year</span>), _, <span class="kw-2">&amp;</span><span class="ident">Parsed</span> { <span class="ident">week_from_mon</span>: <span class="prelude-val">Some</span>(<span class="ident">week_from_mon</span>),
                                      <span class="ident">weekday</span>: <span class="prelude-val">Some</span>(<span class="ident">weekday</span>), .. }) <span class="op">=&gt;</span> {
                <span class="comment">// year, week (starting at 1st Monday), day of the week</span>
                <span class="kw">let</span> <span class="ident">newyear</span> <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(<span class="ident">NaiveDate</span>::<span class="ident">from_yo_opt</span>(<span class="ident">year</span>, <span class="number">1</span>).<span class="ident">ok_or</span>(<span class="ident">OUT_OF_RANGE</span>));
                <span class="kw">let</span> <span class="ident">firstweek</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">newyear</span>.<span class="ident">weekday</span>() {
                    <span class="ident">Weekday</span>::<span class="ident">Sun</span> <span class="op">=&gt;</span> <span class="number">1</span>,
                    <span class="ident">Weekday</span>::<span class="ident">Mon</span> <span class="op">=&gt;</span> <span class="number">0</span>,
                    <span class="ident">Weekday</span>::<span class="ident">Tue</span> <span class="op">=&gt;</span> <span class="number">6</span>,
                    <span class="ident">Weekday</span>::<span class="ident">Wed</span> <span class="op">=&gt;</span> <span class="number">5</span>,
                    <span class="ident">Weekday</span>::<span class="ident">Thu</span> <span class="op">=&gt;</span> <span class="number">4</span>,
                    <span class="ident">Weekday</span>::<span class="ident">Fri</span> <span class="op">=&gt;</span> <span class="number">3</span>,
                    <span class="ident">Weekday</span>::<span class="ident">Sat</span> <span class="op">=&gt;</span> <span class="number">2</span>,
                };

                <span class="comment">// `firstweek+1`-th day of January is the beginning of the week 1.</span>
                <span class="kw">if</span> <span class="ident">week_from_mon</span> <span class="op">&gt;</span> <span class="number">53</span> { <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">OUT_OF_RANGE</span>); } <span class="comment">// can it overflow?</span>
                <span class="kw">let</span> <span class="ident">ndays</span> <span class="op">=</span> <span class="ident">firstweek</span> <span class="op">+</span> (<span class="ident">week_from_mon</span> <span class="kw">as</span> <span class="ident">i32</span> <span class="op">-</span> <span class="number">1</span>) <span class="op">*</span> <span class="number">7</span> <span class="op">+</span>
                            <span class="ident">weekday</span>.<span class="ident">num_days_from_monday</span>() <span class="kw">as</span> <span class="ident">i32</span>;
                <span class="kw">let</span> <span class="ident">date</span> <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(<span class="ident">newyear</span>.<span class="ident">checked_add</span>(<span class="ident">Duration</span>::<span class="ident">days</span>(<span class="ident">ndays</span> <span class="kw">as</span> <span class="ident">i64</span>))
                                       .<span class="ident">ok_or</span>(<span class="ident">OUT_OF_RANGE</span>));
                <span class="kw">if</span> <span class="ident">date</span>.<span class="ident">year</span>() <span class="op">!=</span> <span class="ident">year</span> { <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">OUT_OF_RANGE</span>); } <span class="comment">// early exit for correct error</span>

                (<span class="ident">verify_ymd</span>(<span class="ident">date</span>) <span class="op">&amp;&amp;</span> <span class="ident">verify_isoweekdate</span>(<span class="ident">date</span>) <span class="op">&amp;&amp;</span> <span class="ident">verify_ordinal</span>(<span class="ident">date</span>), <span class="ident">date</span>)
            },

            (_, <span class="prelude-val">Some</span>(<span class="ident">isoyear</span>), <span class="kw-2">&amp;</span><span class="ident">Parsed</span> { <span class="ident">isoweek</span>: <span class="prelude-val">Some</span>(<span class="ident">isoweek</span>), <span class="ident">weekday</span>: <span class="prelude-val">Some</span>(<span class="ident">weekday</span>), .. }) <span class="op">=&gt;</span> {
                <span class="comment">// ISO year, week, day of the week</span>
                <span class="kw">let</span> <span class="ident">date</span> <span class="op">=</span> <span class="ident">NaiveDate</span>::<span class="ident">from_isoywd_opt</span>(<span class="ident">isoyear</span>, <span class="ident">isoweek</span>, <span class="ident">weekday</span>);
                <span class="kw">let</span> <span class="ident">date</span> <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(<span class="ident">date</span>.<span class="ident">ok_or</span>(<span class="ident">OUT_OF_RANGE</span>));
                (<span class="ident">verify_ymd</span>(<span class="ident">date</span>) <span class="op">&amp;&amp;</span> <span class="ident">verify_ordinal</span>(<span class="ident">date</span>), <span class="ident">date</span>)
            },

            (_, _, _) <span class="op">=&gt;</span> <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">NOT_ENOUGH</span>)
        };

        <span class="kw">if</span> <span class="ident">verified</span> {
            <span class="prelude-val">Ok</span>(<span class="ident">parsed_date</span>)
        } <span class="kw">else</span> {
            <span class="prelude-val">Err</span>(<span class="ident">IMPOSSIBLE</span>)
        }
    }

    <span class="doccomment">/// Returns a parsed naive time out of given fields.</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// This method is able to determine the time from given subset of fields:</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// - Hour, minute. (second and nanosecond assumed to be 0)</span>
    <span class="doccomment">/// - Hour, minute, second. (nanosecond assumed to be 0)</span>
    <span class="doccomment">/// - Hour, minute, second, nanosecond.</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// It is able to handle leap seconds when given second is 60.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">to_naive_time</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">ParseResult</span><span class="op">&lt;</span><span class="ident">NaiveTime</span><span class="op">&gt;</span> {
        <span class="kw">let</span> <span class="ident">hour_div_12</span> <span class="op">=</span> <span class="kw">match</span> <span class="self">self</span>.<span class="ident">hour_div_12</span> {
            <span class="prelude-val">Some</span>(<span class="ident">v</span> @ <span class="number">0</span>...<span class="number">1</span>) <span class="op">=&gt;</span> <span class="ident">v</span>,
            <span class="prelude-val">Some</span>(_) <span class="op">=&gt;</span> <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">OUT_OF_RANGE</span>),
            <span class="prelude-val">None</span> <span class="op">=&gt;</span> <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">NOT_ENOUGH</span>),
        };
        <span class="kw">let</span> <span class="ident">hour_mod_12</span> <span class="op">=</span> <span class="kw">match</span> <span class="self">self</span>.<span class="ident">hour_mod_12</span> {
            <span class="prelude-val">Some</span>(<span class="ident">v</span> @ <span class="number">0</span>...<span class="number">11</span>) <span class="op">=&gt;</span> <span class="ident">v</span>,
            <span class="prelude-val">Some</span>(_) <span class="op">=&gt;</span> <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">OUT_OF_RANGE</span>),
            <span class="prelude-val">None</span> <span class="op">=&gt;</span> <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">NOT_ENOUGH</span>),
        };
        <span class="kw">let</span> <span class="ident">hour</span> <span class="op">=</span> <span class="ident">hour_div_12</span> <span class="op">*</span> <span class="number">12</span> <span class="op">+</span> <span class="ident">hour_mod_12</span>;

        <span class="kw">let</span> <span class="ident">minute</span> <span class="op">=</span> <span class="kw">match</span> <span class="self">self</span>.<span class="ident">minute</span> {
            <span class="prelude-val">Some</span>(<span class="ident">v</span> @ <span class="number">0</span>...<span class="number">59</span>) <span class="op">=&gt;</span> <span class="ident">v</span>,
            <span class="prelude-val">Some</span>(_) <span class="op">=&gt;</span> <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">OUT_OF_RANGE</span>),
            <span class="prelude-val">None</span> <span class="op">=&gt;</span> <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">NOT_ENOUGH</span>),
        };

        <span class="comment">// we allow omitting seconds or nanoseconds, but they should be in the range.</span>
        <span class="kw">let</span> (<span class="ident">second</span>, <span class="kw-2">mut</span> <span class="ident">nano</span>) <span class="op">=</span> <span class="kw">match</span> <span class="self">self</span>.<span class="ident">second</span>.<span class="ident">unwrap_or</span>(<span class="number">0</span>) {
            <span class="ident">v</span> @ <span class="number">0</span>...<span class="number">59</span> <span class="op">=&gt;</span> (<span class="ident">v</span>, <span class="number">0</span>),
            <span class="number">60</span> <span class="op">=&gt;</span> (<span class="number">59</span>, <span class="number">1_000_000_000</span>),
            _ <span class="op">=&gt;</span> <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">OUT_OF_RANGE</span>),
        };
        <span class="ident">nano</span> <span class="op">+=</span> <span class="kw">match</span> <span class="self">self</span>.<span class="ident">nanosecond</span> {
            <span class="prelude-val">Some</span>(<span class="ident">v</span> @ <span class="number">0</span>...<span class="number">999_999_999</span>) <span class="kw">if</span> <span class="self">self</span>.<span class="ident">second</span>.<span class="ident">is_some</span>() <span class="op">=&gt;</span> <span class="ident">v</span>,
            <span class="prelude-val">Some</span>(<span class="number">0</span>...<span class="number">999_999_999</span>) <span class="op">=&gt;</span> <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">NOT_ENOUGH</span>), <span class="comment">// second is missing</span>
            <span class="prelude-val">Some</span>(_) <span class="op">=&gt;</span> <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">OUT_OF_RANGE</span>),
            <span class="prelude-val">None</span> <span class="op">=&gt;</span> <span class="number">0</span>,
        };

        <span class="ident">NaiveTime</span>::<span class="ident">from_hms_nano_opt</span>(<span class="ident">hour</span>, <span class="ident">minute</span>, <span class="ident">second</span>, <span class="ident">nano</span>).<span class="ident">ok_or</span>(<span class="ident">OUT_OF_RANGE</span>)
    }

    <span class="doccomment">/// Returns a parsed naive date and time out of given fields,</span>
    <span class="doccomment">/// except for the [`offset`](#structfield.offset) field (assumed to have a given value).</span>
    <span class="doccomment">/// This is required for parsing a local time or other known-timezone inputs.</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// This method is able to determine the combined date and time</span>
    <span class="doccomment">/// from date and time fields or a single [`timestamp`](#structfield.timestamp) field.</span>
    <span class="doccomment">/// Either way those fields have to be consistent to each other.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">to_naive_datetime_with_offset</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">offset</span>: <span class="ident">i32</span>) <span class="op">-&gt;</span> <span class="ident">ParseResult</span><span class="op">&lt;</span><span class="ident">NaiveDateTime</span><span class="op">&gt;</span> {
        <span class="kw">let</span> <span class="ident">date</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">to_naive_date</span>();
        <span class="kw">let</span> <span class="ident">time</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">to_naive_time</span>();
        <span class="kw">if</span> <span class="kw">let</span> (<span class="prelude-val">Ok</span>(<span class="ident">date</span>), <span class="prelude-val">Ok</span>(<span class="ident">time</span>)) <span class="op">=</span> (<span class="ident">date</span>, <span class="ident">time</span>) {
            <span class="kw">let</span> <span class="ident">datetime</span> <span class="op">=</span> <span class="ident">date</span>.<span class="ident">and_time</span>(<span class="ident">time</span>);

            <span class="comment">// verify the timestamp field if any</span>
            <span class="comment">// the following is safe, `timestamp` is very limited in range</span>
            <span class="kw">let</span> <span class="ident">timestamp</span> <span class="op">=</span> <span class="ident">datetime</span>.<span class="ident">timestamp</span>() <span class="op">-</span> <span class="ident">offset</span> <span class="kw">as</span> <span class="ident">i64</span>;
            <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">given_timestamp</span>) <span class="op">=</span> <span class="self">self</span>.<span class="ident">timestamp</span> {
                <span class="comment">// if `datetime` represents a leap second, it might be off by one second.</span>
                <span class="kw">if</span> <span class="ident">given_timestamp</span> <span class="op">!=</span> <span class="ident">timestamp</span> <span class="op">&amp;&amp;</span>
                   <span class="op">!</span>(<span class="ident">datetime</span>.<span class="ident">nanosecond</span>() <span class="op">&gt;=</span> <span class="number">1_000_000_000</span> <span class="op">&amp;&amp;</span> <span class="ident">given_timestamp</span> <span class="op">==</span> <span class="ident">timestamp</span> <span class="op">+</span> <span class="number">1</span>) {
                    <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">IMPOSSIBLE</span>);
                }
            }

            <span class="prelude-val">Ok</span>(<span class="ident">datetime</span>)
        } <span class="kw">else</span> <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">timestamp</span>) <span class="op">=</span> <span class="self">self</span>.<span class="ident">timestamp</span> {
            <span class="kw">use</span> <span class="kw">super</span>::<span class="ident">ParseError</span> <span class="kw">as</span> <span class="ident">PE</span>;
            <span class="kw">use</span> <span class="kw">super</span>::<span class="ident">ParseErrorKind</span>::{<span class="ident">OutOfRange</span>, <span class="ident">Impossible</span>};

            <span class="comment">// if date and time is problematic already, there is no point proceeding.</span>
            <span class="comment">// we at least try to give a correct error though.</span>
            <span class="kw">match</span> (<span class="ident">date</span>, <span class="ident">time</span>) {
                (<span class="prelude-val">Err</span>(<span class="ident">PE</span>(<span class="ident">OutOfRange</span>)), _) <span class="op">|</span> (_, <span class="prelude-val">Err</span>(<span class="ident">PE</span>(<span class="ident">OutOfRange</span>))) <span class="op">=&gt;</span> <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">OUT_OF_RANGE</span>),
                (<span class="prelude-val">Err</span>(<span class="ident">PE</span>(<span class="ident">Impossible</span>)), _) <span class="op">|</span> (_, <span class="prelude-val">Err</span>(<span class="ident">PE</span>(<span class="ident">Impossible</span>))) <span class="op">=&gt;</span> <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">IMPOSSIBLE</span>),
                (_, _) <span class="op">=&gt;</span> {} <span class="comment">// one of them is insufficient</span>
            }

            <span class="comment">// reconstruct date and time fields from timestamp</span>
            <span class="kw">let</span> <span class="ident">ts</span> <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(<span class="ident">timestamp</span>.<span class="ident">checked_add</span>(<span class="ident">offset</span> <span class="kw">as</span> <span class="ident">i64</span>).<span class="ident">ok_or</span>(<span class="ident">OUT_OF_RANGE</span>));
            <span class="kw">let</span> <span class="ident">datetime</span> <span class="op">=</span> <span class="ident">NaiveDateTime</span>::<span class="ident">from_timestamp_opt</span>(<span class="ident">ts</span>, <span class="number">0</span>);
            <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">datetime</span> <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(<span class="ident">datetime</span>.<span class="ident">ok_or</span>(<span class="ident">OUT_OF_RANGE</span>));

            <span class="comment">// fill year, ordinal, hour, minute and second fields from timestamp.</span>
            <span class="comment">// if existing fields are consistent, this will allow the full date/time reconstruction.</span>
            <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">parsed</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">clone</span>();
            <span class="kw">if</span> <span class="ident">parsed</span>.<span class="ident">second</span> <span class="op">==</span> <span class="prelude-val">Some</span>(<span class="number">60</span>) {
                <span class="comment">// `datetime.second()` cannot be 60, so this is the only case for a leap second.</span>
                <span class="kw">match</span> <span class="ident">datetime</span>.<span class="ident">second</span>() {
                    <span class="comment">// it&#39;s okay, just do not try to overwrite the existing field.</span>
                    <span class="number">59</span> <span class="op">=&gt;</span> {}
                    <span class="comment">// `datetime` is known to be off by one second.</span>
                    <span class="number">0</span> <span class="op">=&gt;</span> { <span class="ident">datetime</span> <span class="op">=</span> <span class="ident">datetime</span> <span class="op">-</span> <span class="ident">Duration</span>::<span class="ident">seconds</span>(<span class="number">1</span>); }
                    <span class="comment">// otherwise it is impossible.</span>
                    _ <span class="op">=&gt;</span> <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">IMPOSSIBLE</span>)
                }
                <span class="comment">// ...and we have the correct candidates for other fields.</span>
            } <span class="kw">else</span> {
                <span class="macro">try</span><span class="macro">!</span>(<span class="ident">parsed</span>.<span class="ident">set_second</span>(<span class="ident">datetime</span>.<span class="ident">second</span>() <span class="kw">as</span> <span class="ident">i64</span>));
            }
            <span class="macro">try</span><span class="macro">!</span>(<span class="ident">parsed</span>.<span class="ident">set_year</span>   (<span class="ident">datetime</span>.<span class="ident">year</span>()    <span class="kw">as</span> <span class="ident">i64</span>));
            <span class="macro">try</span><span class="macro">!</span>(<span class="ident">parsed</span>.<span class="ident">set_ordinal</span>(<span class="ident">datetime</span>.<span class="ident">ordinal</span>() <span class="kw">as</span> <span class="ident">i64</span>)); <span class="comment">// more efficient than ymd</span>
            <span class="macro">try</span><span class="macro">!</span>(<span class="ident">parsed</span>.<span class="ident">set_hour</span>   (<span class="ident">datetime</span>.<span class="ident">hour</span>()    <span class="kw">as</span> <span class="ident">i64</span>));
            <span class="macro">try</span><span class="macro">!</span>(<span class="ident">parsed</span>.<span class="ident">set_minute</span> (<span class="ident">datetime</span>.<span class="ident">minute</span>()  <span class="kw">as</span> <span class="ident">i64</span>));
            <span class="macro">try</span><span class="macro">!</span>(<span class="ident">parsed</span>.<span class="ident">set_nanosecond</span>(<span class="number">0</span>)); <span class="comment">// no nanosecond precision in timestamp</span>

            <span class="comment">// validate other fields (e.g. week) and return</span>
            <span class="kw">let</span> <span class="ident">date</span> <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(<span class="ident">parsed</span>.<span class="ident">to_naive_date</span>());
            <span class="kw">let</span> <span class="ident">time</span> <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(<span class="ident">parsed</span>.<span class="ident">to_naive_time</span>());
            <span class="prelude-val">Ok</span>(<span class="ident">date</span>.<span class="ident">and_time</span>(<span class="ident">time</span>))
        } <span class="kw">else</span> {
            <span class="comment">// reproduce the previous error(s)</span>
            <span class="macro">try</span><span class="macro">!</span>(<span class="ident">date</span>);
            <span class="macro">try</span><span class="macro">!</span>(<span class="ident">time</span>);
            <span class="macro">unreachable</span><span class="macro">!</span>()
        }
    }

    <span class="doccomment">/// Returns a parsed fixed time zone offset out of given fields.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">to_fixed_offset</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">ParseResult</span><span class="op">&lt;</span><span class="ident">FixedOffset</span><span class="op">&gt;</span> {
        <span class="self">self</span>.<span class="ident">offset</span>.<span class="ident">and_then</span>(<span class="op">|</span><span class="ident">offset</span><span class="op">|</span> <span class="ident">FixedOffset</span>::<span class="ident">east_opt</span>(<span class="ident">offset</span>)).<span class="ident">ok_or</span>(<span class="ident">OUT_OF_RANGE</span>)
    }

    <span class="doccomment">/// Returns a parsed timezone-aware date and time out of given fields.</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// This method is able to determine the combined date and time</span>
    <span class="doccomment">/// from date and time fields or a single [`timestamp`](#structfield.timestamp) field,</span>
    <span class="doccomment">/// plus a time zone offset.</span>
    <span class="doccomment">/// Either way those fields have to be consistent to each other.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">to_datetime</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">ParseResult</span><span class="op">&lt;</span><span class="ident">DateTime</span><span class="op">&lt;</span><span class="ident">FixedOffset</span><span class="op">&gt;&gt;</span> {
        <span class="kw">let</span> <span class="ident">offset</span> <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">offset</span>.<span class="ident">ok_or</span>(<span class="ident">NOT_ENOUGH</span>));
        <span class="kw">let</span> <span class="ident">datetime</span> <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">to_naive_datetime_with_offset</span>(<span class="ident">offset</span>));
        <span class="kw">let</span> <span class="ident">offset</span> <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(<span class="ident">FixedOffset</span>::<span class="ident">east_opt</span>(<span class="ident">offset</span>).<span class="ident">ok_or</span>(<span class="ident">OUT_OF_RANGE</span>));
        <span class="kw">match</span> <span class="ident">offset</span>.<span class="ident">from_local_datetime</span>(<span class="kw-2">&amp;</span><span class="ident">datetime</span>) {
            <span class="ident">LocalResult</span>::<span class="prelude-val">None</span> <span class="op">=&gt;</span> <span class="prelude-val">Err</span>(<span class="ident">IMPOSSIBLE</span>),
            <span class="ident">LocalResult</span>::<span class="ident">Single</span>(<span class="ident">t</span>) <span class="op">=&gt;</span> <span class="prelude-val">Ok</span>(<span class="ident">t</span>),
            <span class="ident">LocalResult</span>::<span class="ident">Ambiguous</span>(..) <span class="op">=&gt;</span> <span class="prelude-val">Err</span>(<span class="ident">NOT_ENOUGH</span>),
        }
    }

    <span class="doccomment">/// Returns a parsed timezone-aware date and time out of given fields,</span>
    <span class="doccomment">/// with an additional `TimeZone` used to interpret and validate the local date.</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// This method is able to determine the combined date and time</span>
    <span class="doccomment">/// from date and time fields or a single [`timestamp`](#structfield.timestamp) field,</span>
    <span class="doccomment">/// plus a time zone offset.</span>
    <span class="doccomment">/// Either way those fields have to be consistent to each other.</span>
    <span class="doccomment">/// If parsed fields include an UTC offset, it also has to be consistent to</span>
    <span class="doccomment">/// [`offset`](#structfield.offset).</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">to_datetime_with_timezone</span><span class="op">&lt;</span><span class="ident">Tz</span>: <span class="ident">TimeZone</span><span class="op">&gt;</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">tz</span>: <span class="kw-2">&amp;</span><span class="ident">Tz</span>) <span class="op">-&gt;</span> <span class="ident">ParseResult</span><span class="op">&lt;</span><span class="ident">DateTime</span><span class="op">&lt;</span><span class="ident">Tz</span><span class="op">&gt;&gt;</span> {
        <span class="comment">// if we have `timestamp` specified, guess an offset from that.</span>
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">guessed_offset</span> <span class="op">=</span> <span class="number">0</span>;
        <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">timestamp</span>) <span class="op">=</span> <span class="self">self</span>.<span class="ident">timestamp</span> {
            <span class="comment">// make a naive `DateTime` from given timestamp and (if any) nanosecond.</span>
            <span class="comment">// an empty `nanosecond` is always equal to zero, so missing nanosecond is fine.</span>
            <span class="kw">let</span> <span class="ident">nanosecond</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">nanosecond</span>.<span class="ident">unwrap_or</span>(<span class="number">0</span>);
            <span class="kw">let</span> <span class="ident">dt</span> <span class="op">=</span> <span class="ident">NaiveDateTime</span>::<span class="ident">from_timestamp_opt</span>(<span class="ident">timestamp</span>, <span class="ident">nanosecond</span>);
            <span class="kw">let</span> <span class="ident">dt</span> <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(<span class="ident">dt</span>.<span class="ident">ok_or</span>(<span class="ident">OUT_OF_RANGE</span>));

            <span class="comment">// we cannot handle offsets larger than i32 at all. give up if so.</span>
            <span class="comment">// we can instead make `to_naive_datetime_with_offset` to accept i64, but this makes</span>
            <span class="comment">// the algorithm too complex and tons of edge cases. i32 should be enough for all.</span>
            <span class="kw">let</span> <span class="ident">offset</span> <span class="op">=</span> <span class="ident">tz</span>.<span class="ident">offset_from_utc_datetime</span>(<span class="kw-2">&amp;</span><span class="ident">dt</span>).<span class="ident">local_minus_utc</span>().<span class="ident">num_seconds</span>();
            <span class="ident">guessed_offset</span> <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(<span class="ident">offset</span>.<span class="ident">to_i32</span>().<span class="ident">ok_or</span>(<span class="ident">OUT_OF_RANGE</span>));
        }

        <span class="comment">// checks if the given `DateTime` has a consistent `Offset` with given `self.offset`.</span>
        <span class="kw">let</span> <span class="ident">check_offset</span> <span class="op">=</span> <span class="op">|</span><span class="ident">dt</span>: <span class="kw-2">&amp;</span><span class="ident">DateTime</span><span class="op">&lt;</span><span class="ident">Tz</span><span class="op">&gt;</span><span class="op">|</span> {
            <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">offset</span>) <span class="op">=</span> <span class="self">self</span>.<span class="ident">offset</span> {
                <span class="kw">let</span> <span class="ident">delta</span> <span class="op">=</span> <span class="ident">dt</span>.<span class="ident">offset</span>().<span class="ident">local_minus_utc</span>().<span class="ident">num_seconds</span>();
                <span class="comment">// if `delta` does not fit in `i32`, it cannot equal to `self.offset` anyway.</span>
                <span class="ident">delta</span>.<span class="ident">to_i32</span>() <span class="op">==</span> <span class="prelude-val">Some</span>(<span class="ident">offset</span>)
            } <span class="kw">else</span> {
                <span class="bool-val">true</span>
            }
        };

        <span class="comment">// `guessed_offset` should be correct when `self.timestamp` is given.</span>
        <span class="comment">// it will be 0 otherwise, but this is fine as the algorithm ignores offset for that case.</span>
        <span class="kw">let</span> <span class="ident">datetime</span> <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">to_naive_datetime_with_offset</span>(<span class="ident">guessed_offset</span>));
        <span class="kw">match</span> <span class="ident">tz</span>.<span class="ident">from_local_datetime</span>(<span class="kw-2">&amp;</span><span class="ident">datetime</span>) {
            <span class="ident">LocalResult</span>::<span class="prelude-val">None</span> <span class="op">=&gt;</span> <span class="prelude-val">Err</span>(<span class="ident">IMPOSSIBLE</span>),
            <span class="ident">LocalResult</span>::<span class="ident">Single</span>(<span class="ident">t</span>) <span class="op">=&gt;</span> <span class="kw">if</span> <span class="ident">check_offset</span>(<span class="kw-2">&amp;</span><span class="ident">t</span>) {<span class="prelude-val">Ok</span>(<span class="ident">t</span>)} <span class="kw">else</span> {<span class="prelude-val">Err</span>(<span class="ident">IMPOSSIBLE</span>)},
            <span class="ident">LocalResult</span>::<span class="ident">Ambiguous</span>(<span class="ident">min</span>, <span class="ident">max</span>) <span class="op">=&gt;</span> {
                <span class="comment">// try to disambiguate two possible local dates by offset.</span>
                <span class="kw">match</span> (<span class="ident">check_offset</span>(<span class="kw-2">&amp;</span><span class="ident">min</span>), <span class="ident">check_offset</span>(<span class="kw-2">&amp;</span><span class="ident">max</span>)) {
                    (<span class="bool-val">false</span>, <span class="bool-val">false</span>) <span class="op">=&gt;</span> <span class="prelude-val">Err</span>(<span class="ident">IMPOSSIBLE</span>),
                    (<span class="bool-val">false</span>, <span class="bool-val">true</span>) <span class="op">=&gt;</span> <span class="prelude-val">Ok</span>(<span class="ident">max</span>),
                    (<span class="bool-val">true</span>, <span class="bool-val">false</span>) <span class="op">=&gt;</span> <span class="prelude-val">Ok</span>(<span class="ident">min</span>),
                    (<span class="bool-val">true</span>, <span class="bool-val">true</span>) <span class="op">=&gt;</span> <span class="prelude-val">Err</span>(<span class="ident">NOT_ENOUGH</span>),
                }
            }
        }
    }
}

<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">test</span>)]</span>
<span class="kw">mod</span> <span class="ident">tests</span> {
    <span class="kw">use</span> <span class="kw">super</span>::<span class="ident">Parsed</span>;
    <span class="kw">use</span> <span class="kw">super</span>::<span class="kw">super</span>::{<span class="ident">OUT_OF_RANGE</span>, <span class="ident">IMPOSSIBLE</span>, <span class="ident">NOT_ENOUGH</span>};
    <span class="kw">use</span> <span class="ident">Datelike</span>;
    <span class="kw">use</span> <span class="ident">Weekday</span>::<span class="kw-2">*</span>;
    <span class="kw">use</span> <span class="ident">naive</span>::<span class="ident">date</span>::{<span class="self">self</span>, <span class="ident">NaiveDate</span>};
    <span class="kw">use</span> <span class="ident">naive</span>::<span class="ident">time</span>::<span class="ident">NaiveTime</span>;
    <span class="kw">use</span> <span class="ident">offset</span>::<span class="ident">TimeZone</span>;
    <span class="kw">use</span> <span class="ident">offset</span>::<span class="ident">utc</span>::<span class="ident">UTC</span>;
    <span class="kw">use</span> <span class="ident">offset</span>::<span class="ident">fixed</span>::<span class="ident">FixedOffset</span>;

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">test_parsed_set_fields</span>() {
        <span class="comment">// year*, isoyear*</span>
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">p</span> <span class="op">=</span> <span class="ident">Parsed</span>::<span class="ident">new</span>();
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>.<span class="ident">set_year</span>(<span class="number">1987</span>), <span class="prelude-val">Ok</span>(()));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>.<span class="ident">set_year</span>(<span class="number">1986</span>), <span class="prelude-val">Err</span>(<span class="ident">IMPOSSIBLE</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>.<span class="ident">set_year</span>(<span class="number">1988</span>), <span class="prelude-val">Err</span>(<span class="ident">IMPOSSIBLE</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>.<span class="ident">set_year</span>(<span class="number">1987</span>), <span class="prelude-val">Ok</span>(()));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>.<span class="ident">set_year_div_100</span>(<span class="number">20</span>), <span class="prelude-val">Ok</span>(())); <span class="comment">// independent to `year`</span>
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>.<span class="ident">set_year_div_100</span>(<span class="number">21</span>), <span class="prelude-val">Err</span>(<span class="ident">IMPOSSIBLE</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>.<span class="ident">set_year_div_100</span>(<span class="number">19</span>), <span class="prelude-val">Err</span>(<span class="ident">IMPOSSIBLE</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>.<span class="ident">set_year_mod_100</span>(<span class="number">37</span>), <span class="prelude-val">Ok</span>(())); <span class="comment">// ditto</span>
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>.<span class="ident">set_year_mod_100</span>(<span class="number">38</span>), <span class="prelude-val">Err</span>(<span class="ident">IMPOSSIBLE</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>.<span class="ident">set_year_mod_100</span>(<span class="number">36</span>), <span class="prelude-val">Err</span>(<span class="ident">IMPOSSIBLE</span>));

        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">p</span> <span class="op">=</span> <span class="ident">Parsed</span>::<span class="ident">new</span>();
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>.<span class="ident">set_year</span>(<span class="number">0</span>), <span class="prelude-val">Ok</span>(()));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>.<span class="ident">set_year_div_100</span>(<span class="number">0</span>), <span class="prelude-val">Ok</span>(()));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>.<span class="ident">set_year_mod_100</span>(<span class="number">0</span>), <span class="prelude-val">Ok</span>(()));

        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">p</span> <span class="op">=</span> <span class="ident">Parsed</span>::<span class="ident">new</span>();
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>.<span class="ident">set_year_div_100</span>(<span class="op">-</span><span class="number">1</span>), <span class="prelude-val">Err</span>(<span class="ident">OUT_OF_RANGE</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>.<span class="ident">set_year_mod_100</span>(<span class="op">-</span><span class="number">1</span>), <span class="prelude-val">Err</span>(<span class="ident">OUT_OF_RANGE</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>.<span class="ident">set_year</span>(<span class="op">-</span><span class="number">1</span>), <span class="prelude-val">Ok</span>(()));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>.<span class="ident">set_year</span>(<span class="op">-</span><span class="number">2</span>), <span class="prelude-val">Err</span>(<span class="ident">IMPOSSIBLE</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>.<span class="ident">set_year</span>(<span class="number">0</span>), <span class="prelude-val">Err</span>(<span class="ident">IMPOSSIBLE</span>));

        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">p</span> <span class="op">=</span> <span class="ident">Parsed</span>::<span class="ident">new</span>();
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>.<span class="ident">set_year_div_100</span>(<span class="number">0x1_0000_0008</span>), <span class="prelude-val">Err</span>(<span class="ident">OUT_OF_RANGE</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>.<span class="ident">set_year_div_100</span>(<span class="number">8</span>), <span class="prelude-val">Ok</span>(()));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>.<span class="ident">set_year_div_100</span>(<span class="number">0x1_0000_0008</span>), <span class="prelude-val">Err</span>(<span class="ident">OUT_OF_RANGE</span>));

        <span class="comment">// month, week*, isoweek, ordinal, day, minute, second, nanosecond, offset</span>
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">p</span> <span class="op">=</span> <span class="ident">Parsed</span>::<span class="ident">new</span>();
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>.<span class="ident">set_month</span>(<span class="number">7</span>), <span class="prelude-val">Ok</span>(()));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>.<span class="ident">set_month</span>(<span class="number">1</span>), <span class="prelude-val">Err</span>(<span class="ident">IMPOSSIBLE</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>.<span class="ident">set_month</span>(<span class="number">6</span>), <span class="prelude-val">Err</span>(<span class="ident">IMPOSSIBLE</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>.<span class="ident">set_month</span>(<span class="number">8</span>), <span class="prelude-val">Err</span>(<span class="ident">IMPOSSIBLE</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>.<span class="ident">set_month</span>(<span class="number">12</span>), <span class="prelude-val">Err</span>(<span class="ident">IMPOSSIBLE</span>));

        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">p</span> <span class="op">=</span> <span class="ident">Parsed</span>::<span class="ident">new</span>();
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>.<span class="ident">set_month</span>(<span class="number">8</span>), <span class="prelude-val">Ok</span>(()));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>.<span class="ident">set_month</span>(<span class="number">0x1_0000_0008</span>), <span class="prelude-val">Err</span>(<span class="ident">OUT_OF_RANGE</span>));

        <span class="comment">// hour</span>
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">p</span> <span class="op">=</span> <span class="ident">Parsed</span>::<span class="ident">new</span>();
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>.<span class="ident">set_hour</span>(<span class="number">12</span>), <span class="prelude-val">Ok</span>(()));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>.<span class="ident">set_hour</span>(<span class="number">11</span>), <span class="prelude-val">Err</span>(<span class="ident">IMPOSSIBLE</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>.<span class="ident">set_hour</span>(<span class="number">13</span>), <span class="prelude-val">Err</span>(<span class="ident">IMPOSSIBLE</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>.<span class="ident">set_hour</span>(<span class="number">12</span>), <span class="prelude-val">Ok</span>(()));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>.<span class="ident">set_ampm</span>(<span class="bool-val">false</span>), <span class="prelude-val">Err</span>(<span class="ident">IMPOSSIBLE</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>.<span class="ident">set_ampm</span>(<span class="bool-val">true</span>), <span class="prelude-val">Ok</span>(()));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>.<span class="ident">set_hour12</span>(<span class="number">12</span>), <span class="prelude-val">Ok</span>(()));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>.<span class="ident">set_hour12</span>(<span class="number">0</span>), <span class="prelude-val">Err</span>(<span class="ident">OUT_OF_RANGE</span>)); <span class="comment">// requires canonical representation</span>
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>.<span class="ident">set_hour12</span>(<span class="number">1</span>), <span class="prelude-val">Err</span>(<span class="ident">IMPOSSIBLE</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>.<span class="ident">set_hour12</span>(<span class="number">11</span>), <span class="prelude-val">Err</span>(<span class="ident">IMPOSSIBLE</span>));

        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">p</span> <span class="op">=</span> <span class="ident">Parsed</span>::<span class="ident">new</span>();
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>.<span class="ident">set_ampm</span>(<span class="bool-val">true</span>), <span class="prelude-val">Ok</span>(()));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>.<span class="ident">set_hour12</span>(<span class="number">7</span>), <span class="prelude-val">Ok</span>(()));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>.<span class="ident">set_hour</span>(<span class="number">7</span>), <span class="prelude-val">Err</span>(<span class="ident">IMPOSSIBLE</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>.<span class="ident">set_hour</span>(<span class="number">18</span>), <span class="prelude-val">Err</span>(<span class="ident">IMPOSSIBLE</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>.<span class="ident">set_hour</span>(<span class="number">19</span>), <span class="prelude-val">Ok</span>(()));

        <span class="comment">// timestamp</span>
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">p</span> <span class="op">=</span> <span class="ident">Parsed</span>::<span class="ident">new</span>();
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>.<span class="ident">set_timestamp</span>(<span class="number">1_234_567_890</span>), <span class="prelude-val">Ok</span>(()));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>.<span class="ident">set_timestamp</span>(<span class="number">1_234_567_889</span>), <span class="prelude-val">Err</span>(<span class="ident">IMPOSSIBLE</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>.<span class="ident">set_timestamp</span>(<span class="number">1_234_567_891</span>), <span class="prelude-val">Err</span>(<span class="ident">IMPOSSIBLE</span>));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">test_parsed_to_naive_date</span>() {
        <span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">parse</span> {
            ($(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">k</span>:<span class="ident">ident</span>: <span class="macro-nonterminal">$</span><span class="macro-nonterminal">v</span>:<span class="ident">expr</span>),<span class="kw-2">*</span>) <span class="op">=&gt;</span> (
                <span class="ident">Parsed</span> { $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">k</span>: <span class="prelude-val">Some</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">v</span>),)<span class="op">*</span> ..<span class="ident">Parsed</span>::<span class="ident">new</span>() }.<span class="ident">to_naive_date</span>()
            )
        }

        <span class="kw">let</span> <span class="ident">ymd</span> <span class="op">=</span> <span class="op">|</span><span class="ident">y</span>,<span class="ident">m</span>,<span class="ident">d</span><span class="op">|</span> <span class="prelude-val">Ok</span>(<span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>(<span class="ident">y</span>, <span class="ident">m</span>, <span class="ident">d</span>));

        <span class="comment">// ymd: omission of fields</span>
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(), <span class="prelude-val">Err</span>(<span class="ident">NOT_ENOUGH</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">year</span>: <span class="number">1984</span>), <span class="prelude-val">Err</span>(<span class="ident">NOT_ENOUGH</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">year</span>: <span class="number">1984</span>, <span class="ident">month</span>: <span class="number">1</span>), <span class="prelude-val">Err</span>(<span class="ident">NOT_ENOUGH</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">year</span>: <span class="number">1984</span>, <span class="ident">month</span>: <span class="number">1</span>, <span class="ident">day</span>: <span class="number">2</span>), <span class="ident">ymd</span>(<span class="number">1984</span>, <span class="number">1</span>, <span class="number">2</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">year</span>: <span class="number">1984</span>, <span class="ident">day</span>: <span class="number">2</span>), <span class="prelude-val">Err</span>(<span class="ident">NOT_ENOUGH</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">year_div_100</span>: <span class="number">19</span>), <span class="prelude-val">Err</span>(<span class="ident">NOT_ENOUGH</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">year_div_100</span>: <span class="number">19</span>, <span class="ident">year_mod_100</span>: <span class="number">84</span>), <span class="prelude-val">Err</span>(<span class="ident">NOT_ENOUGH</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">year_div_100</span>: <span class="number">19</span>, <span class="ident">year_mod_100</span>: <span class="number">84</span>, <span class="ident">month</span>: <span class="number">1</span>), <span class="prelude-val">Err</span>(<span class="ident">NOT_ENOUGH</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">year_div_100</span>: <span class="number">19</span>, <span class="ident">year_mod_100</span>: <span class="number">84</span>, <span class="ident">month</span>: <span class="number">1</span>, <span class="ident">day</span>: <span class="number">2</span>), <span class="ident">ymd</span>(<span class="number">1984</span>, <span class="number">1</span>, <span class="number">2</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">year_div_100</span>: <span class="number">19</span>, <span class="ident">year_mod_100</span>: <span class="number">84</span>, <span class="ident">day</span>: <span class="number">2</span>), <span class="prelude-val">Err</span>(<span class="ident">NOT_ENOUGH</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">year_div_100</span>: <span class="number">19</span>, <span class="ident">month</span>: <span class="number">1</span>, <span class="ident">day</span>: <span class="number">2</span>), <span class="prelude-val">Err</span>(<span class="ident">NOT_ENOUGH</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">year_mod_100</span>: <span class="number">70</span>, <span class="ident">month</span>: <span class="number">1</span>, <span class="ident">day</span>: <span class="number">2</span>), <span class="ident">ymd</span>(<span class="number">1970</span>, <span class="number">1</span>, <span class="number">2</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">year_mod_100</span>: <span class="number">69</span>, <span class="ident">month</span>: <span class="number">1</span>, <span class="ident">day</span>: <span class="number">2</span>), <span class="ident">ymd</span>(<span class="number">2069</span>, <span class="number">1</span>, <span class="number">2</span>));

        <span class="comment">// ymd: out-of-range conditions</span>
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">year_div_100</span>: <span class="number">19</span>, <span class="ident">year_mod_100</span>: <span class="number">84</span>, <span class="ident">month</span>: <span class="number">2</span>, <span class="ident">day</span>: <span class="number">29</span>),
                   <span class="ident">ymd</span>(<span class="number">1984</span>, <span class="number">2</span>, <span class="number">29</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">year_div_100</span>: <span class="number">19</span>, <span class="ident">year_mod_100</span>: <span class="number">83</span>, <span class="ident">month</span>: <span class="number">2</span>, <span class="ident">day</span>: <span class="number">29</span>),
                   <span class="prelude-val">Err</span>(<span class="ident">OUT_OF_RANGE</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">year_div_100</span>: <span class="number">19</span>, <span class="ident">year_mod_100</span>: <span class="number">83</span>, <span class="ident">month</span>: <span class="number">13</span>, <span class="ident">day</span>: <span class="number">1</span>),
                   <span class="prelude-val">Err</span>(<span class="ident">OUT_OF_RANGE</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">year_div_100</span>: <span class="number">19</span>, <span class="ident">year_mod_100</span>: <span class="number">83</span>, <span class="ident">month</span>: <span class="number">12</span>, <span class="ident">day</span>: <span class="number">31</span>),
                   <span class="ident">ymd</span>(<span class="number">1983</span>, <span class="number">12</span>, <span class="number">31</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">year_div_100</span>: <span class="number">19</span>, <span class="ident">year_mod_100</span>: <span class="number">83</span>, <span class="ident">month</span>: <span class="number">12</span>, <span class="ident">day</span>: <span class="number">32</span>),
                   <span class="prelude-val">Err</span>(<span class="ident">OUT_OF_RANGE</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">year_div_100</span>: <span class="number">19</span>, <span class="ident">year_mod_100</span>: <span class="number">83</span>, <span class="ident">month</span>: <span class="number">12</span>, <span class="ident">day</span>: <span class="number">0</span>),
                   <span class="prelude-val">Err</span>(<span class="ident">OUT_OF_RANGE</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">year_div_100</span>: <span class="number">19</span>, <span class="ident">year_mod_100</span>: <span class="number">100</span>, <span class="ident">month</span>: <span class="number">1</span>, <span class="ident">day</span>: <span class="number">1</span>),
                   <span class="prelude-val">Err</span>(<span class="ident">OUT_OF_RANGE</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">year_div_100</span>: <span class="number">19</span>, <span class="ident">year_mod_100</span>: <span class="op">-</span><span class="number">1</span>, <span class="ident">month</span>: <span class="number">1</span>, <span class="ident">day</span>: <span class="number">1</span>),
                   <span class="prelude-val">Err</span>(<span class="ident">OUT_OF_RANGE</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">year_div_100</span>: <span class="number">0</span>, <span class="ident">year_mod_100</span>: <span class="number">0</span>, <span class="ident">month</span>: <span class="number">1</span>, <span class="ident">day</span>: <span class="number">1</span>),
                   <span class="ident">ymd</span>(<span class="number">0</span>, <span class="number">1</span>, <span class="number">1</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">year_div_100</span>: <span class="op">-</span><span class="number">1</span>, <span class="ident">year_mod_100</span>: <span class="number">42</span>, <span class="ident">month</span>: <span class="number">1</span>, <span class="ident">day</span>: <span class="number">1</span>),
                   <span class="prelude-val">Err</span>(<span class="ident">OUT_OF_RANGE</span>));
        <span class="kw">let</span> <span class="ident">max_year</span> <span class="op">=</span> <span class="ident">date</span>::<span class="ident">MAX</span>.<span class="ident">year</span>();
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">year_div_100</span>: <span class="ident">max_year</span> <span class="op">/</span> <span class="number">100</span>,
                          <span class="ident">year_mod_100</span>: <span class="ident">max_year</span> <span class="op">%</span> <span class="number">100</span>, <span class="ident">month</span>: <span class="number">1</span>, <span class="ident">day</span>: <span class="number">1</span>),
                   <span class="ident">ymd</span>(<span class="ident">max_year</span>, <span class="number">1</span>, <span class="number">1</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">year_div_100</span>: (<span class="ident">max_year</span> <span class="op">+</span> <span class="number">1</span>) <span class="op">/</span> <span class="number">100</span>,
                          <span class="ident">year_mod_100</span>: (<span class="ident">max_year</span> <span class="op">+</span> <span class="number">1</span>) <span class="op">%</span> <span class="number">100</span>, <span class="ident">month</span>: <span class="number">1</span>, <span class="ident">day</span>: <span class="number">1</span>),
                   <span class="prelude-val">Err</span>(<span class="ident">OUT_OF_RANGE</span>));

        <span class="comment">// ymd: conflicting inputs</span>
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">year</span>: <span class="number">1984</span>, <span class="ident">year_div_100</span>: <span class="number">19</span>, <span class="ident">month</span>: <span class="number">1</span>, <span class="ident">day</span>: <span class="number">1</span>), <span class="ident">ymd</span>(<span class="number">1984</span>, <span class="number">1</span>, <span class="number">1</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">year</span>: <span class="number">1984</span>, <span class="ident">year_div_100</span>: <span class="number">20</span>, <span class="ident">month</span>: <span class="number">1</span>, <span class="ident">day</span>: <span class="number">1</span>), <span class="prelude-val">Err</span>(<span class="ident">IMPOSSIBLE</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">year</span>: <span class="number">1984</span>, <span class="ident">year_mod_100</span>: <span class="number">84</span>, <span class="ident">month</span>: <span class="number">1</span>, <span class="ident">day</span>: <span class="number">1</span>), <span class="ident">ymd</span>(<span class="number">1984</span>, <span class="number">1</span>, <span class="number">1</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">year</span>: <span class="number">1984</span>, <span class="ident">year_mod_100</span>: <span class="number">83</span>, <span class="ident">month</span>: <span class="number">1</span>, <span class="ident">day</span>: <span class="number">1</span>), <span class="prelude-val">Err</span>(<span class="ident">IMPOSSIBLE</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">year</span>: <span class="number">1984</span>, <span class="ident">year_div_100</span>: <span class="number">19</span>, <span class="ident">year_mod_100</span>: <span class="number">84</span>, <span class="ident">month</span>: <span class="number">1</span>, <span class="ident">day</span>: <span class="number">1</span>),
                   <span class="ident">ymd</span>(<span class="number">1984</span>, <span class="number">1</span>, <span class="number">1</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">year</span>: <span class="number">1984</span>, <span class="ident">year_div_100</span>: <span class="number">18</span>, <span class="ident">year_mod_100</span>: <span class="number">94</span>, <span class="ident">month</span>: <span class="number">1</span>, <span class="ident">day</span>: <span class="number">1</span>),
                   <span class="prelude-val">Err</span>(<span class="ident">IMPOSSIBLE</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">year</span>: <span class="number">1984</span>, <span class="ident">year_div_100</span>: <span class="number">18</span>, <span class="ident">year_mod_100</span>: <span class="number">184</span>, <span class="ident">month</span>: <span class="number">1</span>, <span class="ident">day</span>: <span class="number">1</span>),
                   <span class="prelude-val">Err</span>(<span class="ident">OUT_OF_RANGE</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">year</span>: <span class="op">-</span><span class="number">1</span>, <span class="ident">year_div_100</span>: <span class="number">0</span>, <span class="ident">year_mod_100</span>: <span class="op">-</span><span class="number">1</span>, <span class="ident">month</span>: <span class="number">1</span>, <span class="ident">day</span>: <span class="number">1</span>),
                   <span class="prelude-val">Err</span>(<span class="ident">OUT_OF_RANGE</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">year</span>: <span class="op">-</span><span class="number">1</span>, <span class="ident">year_div_100</span>: <span class="op">-</span><span class="number">1</span>, <span class="ident">year_mod_100</span>: <span class="number">99</span>, <span class="ident">month</span>: <span class="number">1</span>, <span class="ident">day</span>: <span class="number">1</span>),
                   <span class="prelude-val">Err</span>(<span class="ident">OUT_OF_RANGE</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">year</span>: <span class="op">-</span><span class="number">1</span>, <span class="ident">year_div_100</span>: <span class="number">0</span>, <span class="ident">month</span>: <span class="number">1</span>, <span class="ident">day</span>: <span class="number">1</span>), <span class="prelude-val">Err</span>(<span class="ident">OUT_OF_RANGE</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">year</span>: <span class="op">-</span><span class="number">1</span>, <span class="ident">year_mod_100</span>: <span class="number">99</span>, <span class="ident">month</span>: <span class="number">1</span>, <span class="ident">day</span>: <span class="number">1</span>), <span class="prelude-val">Err</span>(<span class="ident">OUT_OF_RANGE</span>));

        <span class="comment">// weekdates</span>
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">year</span>: <span class="number">2000</span>, <span class="ident">week_from_mon</span>: <span class="number">0</span>), <span class="prelude-val">Err</span>(<span class="ident">NOT_ENOUGH</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">year</span>: <span class="number">2000</span>, <span class="ident">week_from_sun</span>: <span class="number">0</span>), <span class="prelude-val">Err</span>(<span class="ident">NOT_ENOUGH</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">year</span>: <span class="number">2000</span>, <span class="ident">weekday</span>: <span class="ident">Sun</span>), <span class="prelude-val">Err</span>(<span class="ident">NOT_ENOUGH</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">year</span>: <span class="number">2000</span>, <span class="ident">week_from_mon</span>: <span class="number">0</span>, <span class="ident">weekday</span>: <span class="ident">Fri</span>), <span class="prelude-val">Err</span>(<span class="ident">OUT_OF_RANGE</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">year</span>: <span class="number">2000</span>, <span class="ident">week_from_sun</span>: <span class="number">0</span>, <span class="ident">weekday</span>: <span class="ident">Fri</span>), <span class="prelude-val">Err</span>(<span class="ident">OUT_OF_RANGE</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">year</span>: <span class="number">2000</span>, <span class="ident">week_from_mon</span>: <span class="number">0</span>, <span class="ident">weekday</span>: <span class="ident">Sat</span>), <span class="ident">ymd</span>(<span class="number">2000</span>, <span class="number">1</span>, <span class="number">1</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">year</span>: <span class="number">2000</span>, <span class="ident">week_from_sun</span>: <span class="number">0</span>, <span class="ident">weekday</span>: <span class="ident">Sat</span>), <span class="ident">ymd</span>(<span class="number">2000</span>, <span class="number">1</span>, <span class="number">1</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">year</span>: <span class="number">2000</span>, <span class="ident">week_from_mon</span>: <span class="number">0</span>, <span class="ident">weekday</span>: <span class="ident">Sun</span>), <span class="ident">ymd</span>(<span class="number">2000</span>, <span class="number">1</span>, <span class="number">2</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">year</span>: <span class="number">2000</span>, <span class="ident">week_from_sun</span>: <span class="number">1</span>, <span class="ident">weekday</span>: <span class="ident">Sun</span>), <span class="ident">ymd</span>(<span class="number">2000</span>, <span class="number">1</span>, <span class="number">2</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">year</span>: <span class="number">2000</span>, <span class="ident">week_from_mon</span>: <span class="number">1</span>, <span class="ident">weekday</span>: <span class="ident">Mon</span>), <span class="ident">ymd</span>(<span class="number">2000</span>, <span class="number">1</span>, <span class="number">3</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">year</span>: <span class="number">2000</span>, <span class="ident">week_from_sun</span>: <span class="number">1</span>, <span class="ident">weekday</span>: <span class="ident">Mon</span>), <span class="ident">ymd</span>(<span class="number">2000</span>, <span class="number">1</span>, <span class="number">3</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">year</span>: <span class="number">2000</span>, <span class="ident">week_from_mon</span>: <span class="number">1</span>, <span class="ident">weekday</span>: <span class="ident">Sat</span>), <span class="ident">ymd</span>(<span class="number">2000</span>, <span class="number">1</span>, <span class="number">8</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">year</span>: <span class="number">2000</span>, <span class="ident">week_from_sun</span>: <span class="number">1</span>, <span class="ident">weekday</span>: <span class="ident">Sat</span>), <span class="ident">ymd</span>(<span class="number">2000</span>, <span class="number">1</span>, <span class="number">8</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">year</span>: <span class="number">2000</span>, <span class="ident">week_from_mon</span>: <span class="number">1</span>, <span class="ident">weekday</span>: <span class="ident">Sun</span>), <span class="ident">ymd</span>(<span class="number">2000</span>, <span class="number">1</span>, <span class="number">9</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">year</span>: <span class="number">2000</span>, <span class="ident">week_from_sun</span>: <span class="number">2</span>, <span class="ident">weekday</span>: <span class="ident">Sun</span>), <span class="ident">ymd</span>(<span class="number">2000</span>, <span class="number">1</span>, <span class="number">9</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">year</span>: <span class="number">2000</span>, <span class="ident">week_from_mon</span>: <span class="number">2</span>, <span class="ident">weekday</span>: <span class="ident">Mon</span>), <span class="ident">ymd</span>(<span class="number">2000</span>, <span class="number">1</span>, <span class="number">10</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">year</span>: <span class="number">2000</span>, <span class="ident">week_from_sun</span>: <span class="number">52</span>, <span class="ident">weekday</span>: <span class="ident">Sat</span>), <span class="ident">ymd</span>(<span class="number">2000</span>, <span class="number">12</span>, <span class="number">30</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">year</span>: <span class="number">2000</span>, <span class="ident">week_from_sun</span>: <span class="number">53</span>, <span class="ident">weekday</span>: <span class="ident">Sun</span>), <span class="ident">ymd</span>(<span class="number">2000</span>, <span class="number">12</span>, <span class="number">31</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">year</span>: <span class="number">2000</span>, <span class="ident">week_from_sun</span>: <span class="number">53</span>, <span class="ident">weekday</span>: <span class="ident">Mon</span>), <span class="prelude-val">Err</span>(<span class="ident">OUT_OF_RANGE</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">year</span>: <span class="number">2000</span>, <span class="ident">week_from_sun</span>: <span class="number">0xffffffff</span>, <span class="ident">weekday</span>: <span class="ident">Mon</span>), <span class="prelude-val">Err</span>(<span class="ident">OUT_OF_RANGE</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">year</span>: <span class="number">2006</span>, <span class="ident">week_from_sun</span>: <span class="number">0</span>, <span class="ident">weekday</span>: <span class="ident">Sat</span>), <span class="prelude-val">Err</span>(<span class="ident">OUT_OF_RANGE</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">year</span>: <span class="number">2006</span>, <span class="ident">week_from_sun</span>: <span class="number">1</span>, <span class="ident">weekday</span>: <span class="ident">Sun</span>), <span class="ident">ymd</span>(<span class="number">2006</span>, <span class="number">1</span>, <span class="number">1</span>));

        <span class="comment">// weekdates: conflicting inputs</span>
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">year</span>: <span class="number">2000</span>, <span class="ident">week_from_mon</span>: <span class="number">1</span>, <span class="ident">week_from_sun</span>: <span class="number">1</span>, <span class="ident">weekday</span>: <span class="ident">Sat</span>),
                   <span class="ident">ymd</span>(<span class="number">2000</span>, <span class="number">1</span>, <span class="number">8</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">year</span>: <span class="number">2000</span>, <span class="ident">week_from_mon</span>: <span class="number">1</span>, <span class="ident">week_from_sun</span>: <span class="number">2</span>, <span class="ident">weekday</span>: <span class="ident">Sun</span>),
                   <span class="ident">ymd</span>(<span class="number">2000</span>, <span class="number">1</span>, <span class="number">9</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">year</span>: <span class="number">2000</span>, <span class="ident">week_from_mon</span>: <span class="number">1</span>, <span class="ident">week_from_sun</span>: <span class="number">1</span>, <span class="ident">weekday</span>: <span class="ident">Sun</span>),
                   <span class="prelude-val">Err</span>(<span class="ident">IMPOSSIBLE</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">year</span>: <span class="number">2000</span>, <span class="ident">week_from_mon</span>: <span class="number">2</span>, <span class="ident">week_from_sun</span>: <span class="number">2</span>, <span class="ident">weekday</span>: <span class="ident">Sun</span>),
                   <span class="prelude-val">Err</span>(<span class="ident">IMPOSSIBLE</span>));

        <span class="comment">// ISO weekdates</span>
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">isoyear</span>: <span class="number">2004</span>, <span class="ident">isoweek</span>: <span class="number">53</span>), <span class="prelude-val">Err</span>(<span class="ident">NOT_ENOUGH</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">isoyear</span>: <span class="number">2004</span>, <span class="ident">isoweek</span>: <span class="number">53</span>, <span class="ident">weekday</span>: <span class="ident">Fri</span>), <span class="ident">ymd</span>(<span class="number">2004</span>, <span class="number">12</span>, <span class="number">31</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">isoyear</span>: <span class="number">2004</span>, <span class="ident">isoweek</span>: <span class="number">53</span>, <span class="ident">weekday</span>: <span class="ident">Sat</span>), <span class="ident">ymd</span>(<span class="number">2005</span>, <span class="number">1</span>, <span class="number">1</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">isoyear</span>: <span class="number">2004</span>, <span class="ident">isoweek</span>: <span class="number">0xffffffff</span>, <span class="ident">weekday</span>: <span class="ident">Sat</span>), <span class="prelude-val">Err</span>(<span class="ident">OUT_OF_RANGE</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">isoyear</span>: <span class="number">2005</span>, <span class="ident">isoweek</span>: <span class="number">0</span>, <span class="ident">weekday</span>: <span class="ident">Thu</span>), <span class="prelude-val">Err</span>(<span class="ident">OUT_OF_RANGE</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">isoyear</span>: <span class="number">2005</span>, <span class="ident">isoweek</span>: <span class="number">5</span>, <span class="ident">weekday</span>: <span class="ident">Thu</span>), <span class="ident">ymd</span>(<span class="number">2005</span>, <span class="number">2</span>, <span class="number">3</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">isoyear</span>: <span class="number">2005</span>, <span class="ident">weekday</span>: <span class="ident">Thu</span>), <span class="prelude-val">Err</span>(<span class="ident">NOT_ENOUGH</span>));

        <span class="comment">// year and ordinal</span>
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">ordinal</span>: <span class="number">123</span>), <span class="prelude-val">Err</span>(<span class="ident">NOT_ENOUGH</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">year</span>: <span class="number">2000</span>, <span class="ident">ordinal</span>: <span class="number">0</span>), <span class="prelude-val">Err</span>(<span class="ident">OUT_OF_RANGE</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">year</span>: <span class="number">2000</span>, <span class="ident">ordinal</span>: <span class="number">1</span>), <span class="ident">ymd</span>(<span class="number">2000</span>, <span class="number">1</span>, <span class="number">1</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">year</span>: <span class="number">2000</span>, <span class="ident">ordinal</span>: <span class="number">60</span>), <span class="ident">ymd</span>(<span class="number">2000</span>, <span class="number">2</span>, <span class="number">29</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">year</span>: <span class="number">2000</span>, <span class="ident">ordinal</span>: <span class="number">61</span>), <span class="ident">ymd</span>(<span class="number">2000</span>, <span class="number">3</span>, <span class="number">1</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">year</span>: <span class="number">2000</span>, <span class="ident">ordinal</span>: <span class="number">366</span>), <span class="ident">ymd</span>(<span class="number">2000</span>, <span class="number">12</span>, <span class="number">31</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">year</span>: <span class="number">2000</span>, <span class="ident">ordinal</span>: <span class="number">367</span>), <span class="prelude-val">Err</span>(<span class="ident">OUT_OF_RANGE</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">year</span>: <span class="number">2000</span>, <span class="ident">ordinal</span>: <span class="number">0xffffffff</span>), <span class="prelude-val">Err</span>(<span class="ident">OUT_OF_RANGE</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">year</span>: <span class="number">2100</span>, <span class="ident">ordinal</span>: <span class="number">0</span>), <span class="prelude-val">Err</span>(<span class="ident">OUT_OF_RANGE</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">year</span>: <span class="number">2100</span>, <span class="ident">ordinal</span>: <span class="number">1</span>), <span class="ident">ymd</span>(<span class="number">2100</span>, <span class="number">1</span>, <span class="number">1</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">year</span>: <span class="number">2100</span>, <span class="ident">ordinal</span>: <span class="number">59</span>), <span class="ident">ymd</span>(<span class="number">2100</span>, <span class="number">2</span>, <span class="number">28</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">year</span>: <span class="number">2100</span>, <span class="ident">ordinal</span>: <span class="number">60</span>), <span class="ident">ymd</span>(<span class="number">2100</span>, <span class="number">3</span>, <span class="number">1</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">year</span>: <span class="number">2100</span>, <span class="ident">ordinal</span>: <span class="number">365</span>), <span class="ident">ymd</span>(<span class="number">2100</span>, <span class="number">12</span>, <span class="number">31</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">year</span>: <span class="number">2100</span>, <span class="ident">ordinal</span>: <span class="number">366</span>), <span class="prelude-val">Err</span>(<span class="ident">OUT_OF_RANGE</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">year</span>: <span class="number">2100</span>, <span class="ident">ordinal</span>: <span class="number">0xffffffff</span>), <span class="prelude-val">Err</span>(<span class="ident">OUT_OF_RANGE</span>));

        <span class="comment">// more complex cases</span>
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">year</span>: <span class="number">2014</span>, <span class="ident">month</span>: <span class="number">12</span>, <span class="ident">day</span>: <span class="number">31</span>, <span class="ident">ordinal</span>: <span class="number">365</span>, <span class="ident">isoyear</span>: <span class="number">2015</span>, <span class="ident">isoweek</span>: <span class="number">1</span>,
                          <span class="ident">week_from_sun</span>: <span class="number">52</span>, <span class="ident">week_from_mon</span>: <span class="number">52</span>, <span class="ident">weekday</span>: <span class="ident">Wed</span>),
                   <span class="ident">ymd</span>(<span class="number">2014</span>, <span class="number">12</span>, <span class="number">31</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">year</span>: <span class="number">2014</span>, <span class="ident">month</span>: <span class="number">12</span>, <span class="ident">ordinal</span>: <span class="number">365</span>, <span class="ident">isoyear</span>: <span class="number">2015</span>, <span class="ident">isoweek</span>: <span class="number">1</span>,
                          <span class="ident">week_from_sun</span>: <span class="number">52</span>, <span class="ident">week_from_mon</span>: <span class="number">52</span>),
                   <span class="ident">ymd</span>(<span class="number">2014</span>, <span class="number">12</span>, <span class="number">31</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">year</span>: <span class="number">2014</span>, <span class="ident">month</span>: <span class="number">12</span>, <span class="ident">day</span>: <span class="number">31</span>, <span class="ident">ordinal</span>: <span class="number">365</span>, <span class="ident">isoyear</span>: <span class="number">2014</span>, <span class="ident">isoweek</span>: <span class="number">53</span>,
                          <span class="ident">week_from_sun</span>: <span class="number">52</span>, <span class="ident">week_from_mon</span>: <span class="number">52</span>, <span class="ident">weekday</span>: <span class="ident">Wed</span>),
                   <span class="prelude-val">Err</span>(<span class="ident">IMPOSSIBLE</span>)); <span class="comment">// no ISO week date 2014-W53-3</span>
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">year</span>: <span class="number">2012</span>, <span class="ident">isoyear</span>: <span class="number">2015</span>, <span class="ident">isoweek</span>: <span class="number">1</span>,
                          <span class="ident">week_from_sun</span>: <span class="number">52</span>, <span class="ident">week_from_mon</span>: <span class="number">52</span>),
                   <span class="prelude-val">Err</span>(<span class="ident">NOT_ENOUGH</span>)); <span class="comment">// ambiguous (2014-12-29, 2014-12-30, 2014-12-31)</span>
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">year_div_100</span>: <span class="number">20</span>, <span class="ident">isoyear_mod_100</span>: <span class="number">15</span>, <span class="ident">ordinal</span>: <span class="number">366</span>),
                   <span class="prelude-val">Err</span>(<span class="ident">NOT_ENOUGH</span>)); <span class="comment">// technically unique (2014-12-31) but Chrono gives up</span>
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">test_parsed_to_naive_time</span>() {
        <span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">parse</span> {
            ($(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">k</span>:<span class="ident">ident</span>: <span class="macro-nonterminal">$</span><span class="macro-nonterminal">v</span>:<span class="ident">expr</span>),<span class="kw-2">*</span>) <span class="op">=&gt;</span> (
                <span class="ident">Parsed</span> { $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">k</span>: <span class="prelude-val">Some</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">v</span>),)<span class="op">*</span> ..<span class="ident">Parsed</span>::<span class="ident">new</span>() }.<span class="ident">to_naive_time</span>()
            )
        }

        <span class="kw">let</span> <span class="ident">hms</span> <span class="op">=</span> <span class="op">|</span><span class="ident">h</span>,<span class="ident">m</span>,<span class="ident">s</span><span class="op">|</span> <span class="prelude-val">Ok</span>(<span class="ident">NaiveTime</span>::<span class="ident">from_hms</span>(<span class="ident">h</span>, <span class="ident">m</span>, <span class="ident">s</span>));
        <span class="kw">let</span> <span class="ident">hmsn</span> <span class="op">=</span> <span class="op">|</span><span class="ident">h</span>,<span class="ident">m</span>,<span class="ident">s</span>,<span class="ident">n</span><span class="op">|</span> <span class="prelude-val">Ok</span>(<span class="ident">NaiveTime</span>::<span class="ident">from_hms_nano</span>(<span class="ident">h</span>, <span class="ident">m</span>, <span class="ident">s</span>, <span class="ident">n</span>));

        <span class="comment">// omission of fields</span>
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(), <span class="prelude-val">Err</span>(<span class="ident">NOT_ENOUGH</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">hour_div_12</span>: <span class="number">0</span>), <span class="prelude-val">Err</span>(<span class="ident">NOT_ENOUGH</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">hour_div_12</span>: <span class="number">0</span>, <span class="ident">hour_mod_12</span>: <span class="number">1</span>), <span class="prelude-val">Err</span>(<span class="ident">NOT_ENOUGH</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">hour_div_12</span>: <span class="number">0</span>, <span class="ident">hour_mod_12</span>: <span class="number">1</span>, <span class="ident">minute</span>: <span class="number">23</span>), <span class="ident">hms</span>(<span class="number">1</span>,<span class="number">23</span>,<span class="number">0</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">hour_div_12</span>: <span class="number">0</span>, <span class="ident">hour_mod_12</span>: <span class="number">1</span>, <span class="ident">minute</span>: <span class="number">23</span>, <span class="ident">second</span>: <span class="number">45</span>), <span class="ident">hms</span>(<span class="number">1</span>,<span class="number">23</span>,<span class="number">45</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">hour_div_12</span>: <span class="number">0</span>, <span class="ident">hour_mod_12</span>: <span class="number">1</span>, <span class="ident">minute</span>: <span class="number">23</span>, <span class="ident">second</span>: <span class="number">45</span>,
                          <span class="ident">nanosecond</span>: <span class="number">678_901_234</span>),
                   <span class="ident">hmsn</span>(<span class="number">1</span>,<span class="number">23</span>,<span class="number">45</span>,<span class="number">678_901_234</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">hour_div_12</span>: <span class="number">1</span>, <span class="ident">hour_mod_12</span>: <span class="number">11</span>, <span class="ident">minute</span>: <span class="number">45</span>, <span class="ident">second</span>: <span class="number">6</span>), <span class="ident">hms</span>(<span class="number">23</span>,<span class="number">45</span>,<span class="number">6</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">hour_mod_12</span>: <span class="number">1</span>, <span class="ident">minute</span>: <span class="number">23</span>), <span class="prelude-val">Err</span>(<span class="ident">NOT_ENOUGH</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">hour_div_12</span>: <span class="number">0</span>, <span class="ident">hour_mod_12</span>: <span class="number">1</span>, <span class="ident">minute</span>: <span class="number">23</span>, <span class="ident">nanosecond</span>: <span class="number">456_789_012</span>),
                   <span class="prelude-val">Err</span>(<span class="ident">NOT_ENOUGH</span>));

        <span class="comment">// out-of-range conditions</span>
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">hour_div_12</span>: <span class="number">2</span>, <span class="ident">hour_mod_12</span>: <span class="number">0</span>, <span class="ident">minute</span>: <span class="number">0</span>), <span class="prelude-val">Err</span>(<span class="ident">OUT_OF_RANGE</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">hour_div_12</span>: <span class="number">1</span>, <span class="ident">hour_mod_12</span>: <span class="number">12</span>, <span class="ident">minute</span>: <span class="number">0</span>), <span class="prelude-val">Err</span>(<span class="ident">OUT_OF_RANGE</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">hour_div_12</span>: <span class="number">0</span>, <span class="ident">hour_mod_12</span>: <span class="number">1</span>, <span class="ident">minute</span>: <span class="number">60</span>), <span class="prelude-val">Err</span>(<span class="ident">OUT_OF_RANGE</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">hour_div_12</span>: <span class="number">0</span>, <span class="ident">hour_mod_12</span>: <span class="number">1</span>, <span class="ident">minute</span>: <span class="number">23</span>, <span class="ident">second</span>: <span class="number">61</span>),
                   <span class="prelude-val">Err</span>(<span class="ident">OUT_OF_RANGE</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">hour_div_12</span>: <span class="number">0</span>, <span class="ident">hour_mod_12</span>: <span class="number">1</span>, <span class="ident">minute</span>: <span class="number">23</span>, <span class="ident">second</span>: <span class="number">34</span>,
                          <span class="ident">nanosecond</span>: <span class="number">1_000_000_000</span>),
                   <span class="prelude-val">Err</span>(<span class="ident">OUT_OF_RANGE</span>));

        <span class="comment">// leap seconds</span>
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">hour_div_12</span>: <span class="number">0</span>, <span class="ident">hour_mod_12</span>: <span class="number">1</span>, <span class="ident">minute</span>: <span class="number">23</span>, <span class="ident">second</span>: <span class="number">60</span>),
                   <span class="ident">hmsn</span>(<span class="number">1</span>,<span class="number">23</span>,<span class="number">59</span>,<span class="number">1_000_000_000</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">hour_div_12</span>: <span class="number">0</span>, <span class="ident">hour_mod_12</span>: <span class="number">1</span>, <span class="ident">minute</span>: <span class="number">23</span>, <span class="ident">second</span>: <span class="number">60</span>,
                          <span class="ident">nanosecond</span>: <span class="number">999_999_999</span>),
                   <span class="ident">hmsn</span>(<span class="number">1</span>,<span class="number">23</span>,<span class="number">59</span>,<span class="number">1_999_999_999</span>));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">test_parsed_to_naive_datetime_with_offset</span>() {
        <span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">parse</span> {
            (<span class="ident">offset</span> <span class="op">=</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">offset</span>:<span class="ident">expr</span>; $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">k</span>:<span class="ident">ident</span>: <span class="macro-nonterminal">$</span><span class="macro-nonterminal">v</span>:<span class="ident">expr</span>),<span class="kw-2">*</span>) <span class="op">=&gt;</span> (
                <span class="ident">Parsed</span> { $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">k</span>: <span class="prelude-val">Some</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">v</span>),)<span class="op">*</span> ..<span class="ident">Parsed</span>::<span class="ident">new</span>() }.<span class="ident">to_naive_datetime_with_offset</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">offset</span>)
            );
            ($(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">k</span>:<span class="ident">ident</span>: <span class="macro-nonterminal">$</span><span class="macro-nonterminal">v</span>:<span class="ident">expr</span>),<span class="kw-2">*</span>) <span class="op">=&gt;</span> (<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">offset</span> <span class="op">=</span> <span class="number">0</span>; $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">k</span>: <span class="macro-nonterminal">$</span><span class="macro-nonterminal">v</span>),<span class="kw-2">*</span>))
        }

        <span class="kw">let</span> <span class="ident">ymdhms</span> <span class="op">=</span> <span class="op">|</span><span class="ident">y</span>,<span class="ident">m</span>,<span class="ident">d</span>,<span class="ident">h</span>,<span class="ident">n</span>,<span class="ident">s</span><span class="op">|</span> <span class="prelude-val">Ok</span>(<span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>(<span class="ident">y</span>, <span class="ident">m</span>, <span class="ident">d</span>).<span class="ident">and_hms</span>(<span class="ident">h</span>, <span class="ident">n</span>, <span class="ident">s</span>));
        <span class="kw">let</span> <span class="ident">ymdhmsn</span> <span class="op">=</span>
            <span class="op">|</span><span class="ident">y</span>,<span class="ident">m</span>,<span class="ident">d</span>,<span class="ident">h</span>,<span class="ident">n</span>,<span class="ident">s</span>,<span class="ident">nano</span><span class="op">|</span> <span class="prelude-val">Ok</span>(<span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>(<span class="ident">y</span>, <span class="ident">m</span>, <span class="ident">d</span>).<span class="ident">and_hms_nano</span>(<span class="ident">h</span>, <span class="ident">n</span>, <span class="ident">s</span>, <span class="ident">nano</span>));

        <span class="comment">// omission of fields</span>
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(), <span class="prelude-val">Err</span>(<span class="ident">NOT_ENOUGH</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">year</span>: <span class="number">2015</span>, <span class="ident">month</span>: <span class="number">1</span>, <span class="ident">day</span>: <span class="number">30</span>,
                          <span class="ident">hour_div_12</span>: <span class="number">1</span>, <span class="ident">hour_mod_12</span>: <span class="number">2</span>, <span class="ident">minute</span>: <span class="number">38</span>),
                   <span class="ident">ymdhms</span>(<span class="number">2015</span>,<span class="number">1</span>,<span class="number">30</span>, <span class="number">14</span>,<span class="number">38</span>,<span class="number">0</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">year</span>: <span class="number">1997</span>, <span class="ident">month</span>: <span class="number">1</span>, <span class="ident">day</span>: <span class="number">30</span>,
                          <span class="ident">hour_div_12</span>: <span class="number">1</span>, <span class="ident">hour_mod_12</span>: <span class="number">2</span>, <span class="ident">minute</span>: <span class="number">38</span>, <span class="ident">second</span>: <span class="number">5</span>),
                   <span class="ident">ymdhms</span>(<span class="number">1997</span>,<span class="number">1</span>,<span class="number">30</span>, <span class="number">14</span>,<span class="number">38</span>,<span class="number">5</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">year</span>: <span class="number">2012</span>, <span class="ident">ordinal</span>: <span class="number">34</span>, <span class="ident">hour_div_12</span>: <span class="number">0</span>, <span class="ident">hour_mod_12</span>: <span class="number">5</span>,
                          <span class="ident">minute</span>: <span class="number">6</span>, <span class="ident">second</span>: <span class="number">7</span>, <span class="ident">nanosecond</span>: <span class="number">890_123_456</span>),
                   <span class="ident">ymdhmsn</span>(<span class="number">2012</span>,<span class="number">2</span>,<span class="number">3</span>, <span class="number">5</span>,<span class="number">6</span>,<span class="number">7</span>,<span class="number">890_123_456</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">timestamp</span>: <span class="number">0</span>), <span class="ident">ymdhms</span>(<span class="number">1970</span>,<span class="number">1</span>,<span class="number">1</span>, <span class="number">0</span>,<span class="number">0</span>,<span class="number">0</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">timestamp</span>: <span class="number">1</span>, <span class="ident">nanosecond</span>: <span class="number">0</span>), <span class="ident">ymdhms</span>(<span class="number">1970</span>,<span class="number">1</span>,<span class="number">1</span>, <span class="number">0</span>,<span class="number">0</span>,<span class="number">1</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">timestamp</span>: <span class="number">1</span>, <span class="ident">nanosecond</span>: <span class="number">1</span>), <span class="prelude-val">Err</span>(<span class="ident">IMPOSSIBLE</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">timestamp</span>: <span class="number">1_420_000_000</span>), <span class="ident">ymdhms</span>(<span class="number">2014</span>,<span class="number">12</span>,<span class="number">31</span>, <span class="number">4</span>,<span class="number">26</span>,<span class="number">40</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">timestamp</span>: <span class="op">-</span><span class="number">0x1_0000_0000</span>), <span class="ident">ymdhms</span>(<span class="number">1833</span>,<span class="number">11</span>,<span class="number">24</span>, <span class="number">17</span>,<span class="number">31</span>,<span class="number">44</span>));

        <span class="comment">// full fields</span>
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">year</span>: <span class="number">2014</span>, <span class="ident">year_div_100</span>: <span class="number">20</span>, <span class="ident">year_mod_100</span>: <span class="number">14</span>, <span class="ident">month</span>: <span class="number">12</span>, <span class="ident">day</span>: <span class="number">31</span>,
                          <span class="ident">ordinal</span>: <span class="number">365</span>, <span class="ident">isoyear</span>: <span class="number">2015</span>, <span class="ident">isoyear_div_100</span>: <span class="number">20</span>, <span class="ident">isoyear_mod_100</span>: <span class="number">15</span>,
                          <span class="ident">isoweek</span>: <span class="number">1</span>, <span class="ident">week_from_sun</span>: <span class="number">52</span>, <span class="ident">week_from_mon</span>: <span class="number">52</span>, <span class="ident">weekday</span>: <span class="ident">Wed</span>,
                          <span class="ident">hour_div_12</span>: <span class="number">0</span>, <span class="ident">hour_mod_12</span>: <span class="number">4</span>, <span class="ident">minute</span>: <span class="number">26</span>, <span class="ident">second</span>: <span class="number">40</span>,
                          <span class="ident">nanosecond</span>: <span class="number">12_345_678</span>, <span class="ident">timestamp</span>: <span class="number">1_420_000_000</span>),
                   <span class="ident">ymdhmsn</span>(<span class="number">2014</span>,<span class="number">12</span>,<span class="number">31</span>, <span class="number">4</span>,<span class="number">26</span>,<span class="number">40</span>,<span class="number">12_345_678</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">year</span>: <span class="number">2014</span>, <span class="ident">year_div_100</span>: <span class="number">20</span>, <span class="ident">year_mod_100</span>: <span class="number">14</span>, <span class="ident">month</span>: <span class="number">12</span>, <span class="ident">day</span>: <span class="number">31</span>,
                          <span class="ident">ordinal</span>: <span class="number">365</span>, <span class="ident">isoyear</span>: <span class="number">2015</span>, <span class="ident">isoyear_div_100</span>: <span class="number">20</span>, <span class="ident">isoyear_mod_100</span>: <span class="number">15</span>,
                          <span class="ident">isoweek</span>: <span class="number">1</span>, <span class="ident">week_from_sun</span>: <span class="number">52</span>, <span class="ident">week_from_mon</span>: <span class="number">52</span>, <span class="ident">weekday</span>: <span class="ident">Wed</span>,
                          <span class="ident">hour_div_12</span>: <span class="number">0</span>, <span class="ident">hour_mod_12</span>: <span class="number">4</span>, <span class="ident">minute</span>: <span class="number">26</span>, <span class="ident">second</span>: <span class="number">40</span>,
                          <span class="ident">nanosecond</span>: <span class="number">12_345_678</span>, <span class="ident">timestamp</span>: <span class="number">1_419_999_999</span>),
                   <span class="prelude-val">Err</span>(<span class="ident">IMPOSSIBLE</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">offset</span> <span class="op">=</span> <span class="number">32400</span>;
                          <span class="ident">year</span>: <span class="number">2014</span>, <span class="ident">year_div_100</span>: <span class="number">20</span>, <span class="ident">year_mod_100</span>: <span class="number">14</span>, <span class="ident">month</span>: <span class="number">12</span>, <span class="ident">day</span>: <span class="number">31</span>,
                          <span class="ident">ordinal</span>: <span class="number">365</span>, <span class="ident">isoyear</span>: <span class="number">2015</span>, <span class="ident">isoyear_div_100</span>: <span class="number">20</span>, <span class="ident">isoyear_mod_100</span>: <span class="number">15</span>,
                          <span class="ident">isoweek</span>: <span class="number">1</span>, <span class="ident">week_from_sun</span>: <span class="number">52</span>, <span class="ident">week_from_mon</span>: <span class="number">52</span>, <span class="ident">weekday</span>: <span class="ident">Wed</span>,
                          <span class="ident">hour_div_12</span>: <span class="number">0</span>, <span class="ident">hour_mod_12</span>: <span class="number">4</span>, <span class="ident">minute</span>: <span class="number">26</span>, <span class="ident">second</span>: <span class="number">40</span>,
                          <span class="ident">nanosecond</span>: <span class="number">12_345_678</span>, <span class="ident">timestamp</span>: <span class="number">1_419_967_600</span>),
                   <span class="ident">ymdhmsn</span>(<span class="number">2014</span>,<span class="number">12</span>,<span class="number">31</span>, <span class="number">4</span>,<span class="number">26</span>,<span class="number">40</span>,<span class="number">12_345_678</span>));

        <span class="comment">// more timestamps</span>
        <span class="kw">let</span> <span class="ident">max_days_from_year_1970</span> <span class="op">=</span> <span class="ident">date</span>::<span class="ident">MAX</span> <span class="op">-</span> <span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>(<span class="number">1970</span>,<span class="number">1</span>,<span class="number">1</span>);
        <span class="kw">let</span> <span class="ident">year_0_from_year_1970</span> <span class="op">=</span> <span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>(<span class="number">0</span>,<span class="number">1</span>,<span class="number">1</span>) <span class="op">-</span> <span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>(<span class="number">1970</span>,<span class="number">1</span>,<span class="number">1</span>);
        <span class="kw">let</span> <span class="ident">min_days_from_year_1970</span> <span class="op">=</span> <span class="ident">date</span>::<span class="ident">MIN</span> <span class="op">-</span> <span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>(<span class="number">1970</span>,<span class="number">1</span>,<span class="number">1</span>);
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">timestamp</span>: <span class="ident">min_days_from_year_1970</span>.<span class="ident">num_seconds</span>()),
                   <span class="ident">ymdhms</span>(<span class="ident">date</span>::<span class="ident">MIN</span>.<span class="ident">year</span>(),<span class="number">1</span>,<span class="number">1</span>, <span class="number">0</span>,<span class="number">0</span>,<span class="number">0</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">timestamp</span>: <span class="ident">year_0_from_year_1970</span>.<span class="ident">num_seconds</span>()),
                   <span class="ident">ymdhms</span>(<span class="number">0</span>,<span class="number">1</span>,<span class="number">1</span>, <span class="number">0</span>,<span class="number">0</span>,<span class="number">0</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">timestamp</span>: <span class="ident">max_days_from_year_1970</span>.<span class="ident">num_seconds</span>() <span class="op">+</span> <span class="number">86399</span>),
                   <span class="ident">ymdhms</span>(<span class="ident">date</span>::<span class="ident">MAX</span>.<span class="ident">year</span>(),<span class="number">12</span>,<span class="number">31</span>, <span class="number">23</span>,<span class="number">59</span>,<span class="number">59</span>));

        <span class="comment">// leap seconds #1: partial fields</span>
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">second</span>: <span class="number">59</span>, <span class="ident">timestamp</span>: <span class="number">1_341_100_798</span>), <span class="prelude-val">Err</span>(<span class="ident">IMPOSSIBLE</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">second</span>: <span class="number">59</span>, <span class="ident">timestamp</span>: <span class="number">1_341_100_799</span>), <span class="ident">ymdhms</span>(<span class="number">2012</span>,<span class="number">6</span>,<span class="number">30</span>, <span class="number">23</span>,<span class="number">59</span>,<span class="number">59</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">second</span>: <span class="number">59</span>, <span class="ident">timestamp</span>: <span class="number">1_341_100_800</span>), <span class="prelude-val">Err</span>(<span class="ident">IMPOSSIBLE</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">second</span>: <span class="number">60</span>, <span class="ident">timestamp</span>: <span class="number">1_341_100_799</span>),
                   <span class="ident">ymdhmsn</span>(<span class="number">2012</span>,<span class="number">6</span>,<span class="number">30</span>, <span class="number">23</span>,<span class="number">59</span>,<span class="number">59</span>,<span class="number">1_000_000_000</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">second</span>: <span class="number">60</span>, <span class="ident">timestamp</span>: <span class="number">1_341_100_800</span>),
                   <span class="ident">ymdhmsn</span>(<span class="number">2012</span>,<span class="number">6</span>,<span class="number">30</span>, <span class="number">23</span>,<span class="number">59</span>,<span class="number">59</span>,<span class="number">1_000_000_000</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">second</span>: <span class="number">0</span>, <span class="ident">timestamp</span>: <span class="number">1_341_100_800</span>), <span class="ident">ymdhms</span>(<span class="number">2012</span>,<span class="number">7</span>,<span class="number">1</span>, <span class="number">0</span>,<span class="number">0</span>,<span class="number">0</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">second</span>: <span class="number">1</span>, <span class="ident">timestamp</span>: <span class="number">1_341_100_800</span>), <span class="prelude-val">Err</span>(<span class="ident">IMPOSSIBLE</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">second</span>: <span class="number">60</span>, <span class="ident">timestamp</span>: <span class="number">1_341_100_801</span>), <span class="prelude-val">Err</span>(<span class="ident">IMPOSSIBLE</span>));

        <span class="comment">// leap seconds #2: full fields</span>
        <span class="comment">// we need to have separate tests for them since it uses another control flow.</span>
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">year</span>: <span class="number">2012</span>, <span class="ident">ordinal</span>: <span class="number">182</span>, <span class="ident">hour_div_12</span>: <span class="number">1</span>, <span class="ident">hour_mod_12</span>: <span class="number">11</span>,
                          <span class="ident">minute</span>: <span class="number">59</span>, <span class="ident">second</span>: <span class="number">59</span>, <span class="ident">timestamp</span>: <span class="number">1_341_100_798</span>),
                   <span class="prelude-val">Err</span>(<span class="ident">IMPOSSIBLE</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">year</span>: <span class="number">2012</span>, <span class="ident">ordinal</span>: <span class="number">182</span>, <span class="ident">hour_div_12</span>: <span class="number">1</span>, <span class="ident">hour_mod_12</span>: <span class="number">11</span>,
                          <span class="ident">minute</span>: <span class="number">59</span>, <span class="ident">second</span>: <span class="number">59</span>, <span class="ident">timestamp</span>: <span class="number">1_341_100_799</span>),
                   <span class="ident">ymdhms</span>(<span class="number">2012</span>,<span class="number">6</span>,<span class="number">30</span>, <span class="number">23</span>,<span class="number">59</span>,<span class="number">59</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">year</span>: <span class="number">2012</span>, <span class="ident">ordinal</span>: <span class="number">182</span>, <span class="ident">hour_div_12</span>: <span class="number">1</span>, <span class="ident">hour_mod_12</span>: <span class="number">11</span>,
                          <span class="ident">minute</span>: <span class="number">59</span>, <span class="ident">second</span>: <span class="number">59</span>, <span class="ident">timestamp</span>: <span class="number">1_341_100_800</span>),
                   <span class="prelude-val">Err</span>(<span class="ident">IMPOSSIBLE</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">year</span>: <span class="number">2012</span>, <span class="ident">ordinal</span>: <span class="number">182</span>, <span class="ident">hour_div_12</span>: <span class="number">1</span>, <span class="ident">hour_mod_12</span>: <span class="number">11</span>,
                          <span class="ident">minute</span>: <span class="number">59</span>, <span class="ident">second</span>: <span class="number">60</span>, <span class="ident">timestamp</span>: <span class="number">1_341_100_799</span>),
                   <span class="ident">ymdhmsn</span>(<span class="number">2012</span>,<span class="number">6</span>,<span class="number">30</span>, <span class="number">23</span>,<span class="number">59</span>,<span class="number">59</span>,<span class="number">1_000_000_000</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">year</span>: <span class="number">2012</span>, <span class="ident">ordinal</span>: <span class="number">182</span>, <span class="ident">hour_div_12</span>: <span class="number">1</span>, <span class="ident">hour_mod_12</span>: <span class="number">11</span>,
                          <span class="ident">minute</span>: <span class="number">59</span>, <span class="ident">second</span>: <span class="number">60</span>, <span class="ident">timestamp</span>: <span class="number">1_341_100_800</span>),
                   <span class="ident">ymdhmsn</span>(<span class="number">2012</span>,<span class="number">6</span>,<span class="number">30</span>, <span class="number">23</span>,<span class="number">59</span>,<span class="number">59</span>,<span class="number">1_000_000_000</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">year</span>: <span class="number">2012</span>, <span class="ident">ordinal</span>: <span class="number">183</span>, <span class="ident">hour_div_12</span>: <span class="number">0</span>, <span class="ident">hour_mod_12</span>: <span class="number">0</span>,
                          <span class="ident">minute</span>: <span class="number">0</span>, <span class="ident">second</span>: <span class="number">0</span>, <span class="ident">timestamp</span>: <span class="number">1_341_100_800</span>),
                   <span class="ident">ymdhms</span>(<span class="number">2012</span>,<span class="number">7</span>,<span class="number">1</span>, <span class="number">0</span>,<span class="number">0</span>,<span class="number">0</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">year</span>: <span class="number">2012</span>, <span class="ident">ordinal</span>: <span class="number">183</span>, <span class="ident">hour_div_12</span>: <span class="number">0</span>, <span class="ident">hour_mod_12</span>: <span class="number">0</span>,
                          <span class="ident">minute</span>: <span class="number">0</span>, <span class="ident">second</span>: <span class="number">1</span>, <span class="ident">timestamp</span>: <span class="number">1_341_100_800</span>),
                   <span class="prelude-val">Err</span>(<span class="ident">IMPOSSIBLE</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">year</span>: <span class="number">2012</span>, <span class="ident">ordinal</span>: <span class="number">182</span>, <span class="ident">hour_div_12</span>: <span class="number">1</span>, <span class="ident">hour_mod_12</span>: <span class="number">11</span>,
                          <span class="ident">minute</span>: <span class="number">59</span>, <span class="ident">second</span>: <span class="number">60</span>, <span class="ident">timestamp</span>: <span class="number">1_341_100_801</span>),
                   <span class="prelude-val">Err</span>(<span class="ident">IMPOSSIBLE</span>));

        <span class="comment">// error codes</span>
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">year</span>: <span class="number">2015</span>, <span class="ident">month</span>: <span class="number">1</span>, <span class="ident">day</span>: <span class="number">20</span>, <span class="ident">weekday</span>: <span class="ident">Tue</span>,
                          <span class="ident">hour_div_12</span>: <span class="number">2</span>, <span class="ident">hour_mod_12</span>: <span class="number">1</span>, <span class="ident">minute</span>: <span class="number">35</span>, <span class="ident">second</span>: <span class="number">20</span>),
                   <span class="prelude-val">Err</span>(<span class="ident">OUT_OF_RANGE</span>)); <span class="comment">// `hour_div_12` is out of range</span>
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">test_parsed_to_datetime</span>() {
        <span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">parse</span> {
            ($(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">k</span>:<span class="ident">ident</span>: <span class="macro-nonterminal">$</span><span class="macro-nonterminal">v</span>:<span class="ident">expr</span>),<span class="kw-2">*</span>) <span class="op">=&gt;</span> (
                <span class="ident">Parsed</span> { $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">k</span>: <span class="prelude-val">Some</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">v</span>),)<span class="op">*</span> ..<span class="ident">Parsed</span>::<span class="ident">new</span>() }.<span class="ident">to_datetime</span>()
            )
        }

        <span class="kw">let</span> <span class="ident">ymdhmsn</span> <span class="op">=</span> <span class="op">|</span><span class="ident">y</span>,<span class="ident">m</span>,<span class="ident">d</span>,<span class="ident">h</span>,<span class="ident">n</span>,<span class="ident">s</span>,<span class="ident">nano</span>,<span class="ident">off</span><span class="op">|</span> <span class="prelude-val">Ok</span>(<span class="ident">FixedOffset</span>::<span class="ident">east</span>(<span class="ident">off</span>).<span class="ident">ymd</span>(<span class="ident">y</span>, <span class="ident">m</span>, <span class="ident">d</span>)
                                                                      .<span class="ident">and_hms_nano</span>(<span class="ident">h</span>, <span class="ident">n</span>, <span class="ident">s</span>, <span class="ident">nano</span>));

        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">offset</span>: <span class="number">0</span>), <span class="prelude-val">Err</span>(<span class="ident">NOT_ENOUGH</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">year</span>: <span class="number">2014</span>, <span class="ident">ordinal</span>: <span class="number">365</span>, <span class="ident">hour_div_12</span>: <span class="number">0</span>, <span class="ident">hour_mod_12</span>: <span class="number">4</span>,
                          <span class="ident">minute</span>: <span class="number">26</span>, <span class="ident">second</span>: <span class="number">40</span>, <span class="ident">nanosecond</span>: <span class="number">12_345_678</span>),
                   <span class="prelude-val">Err</span>(<span class="ident">NOT_ENOUGH</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">year</span>: <span class="number">2014</span>, <span class="ident">ordinal</span>: <span class="number">365</span>, <span class="ident">hour_div_12</span>: <span class="number">0</span>, <span class="ident">hour_mod_12</span>: <span class="number">4</span>,
                          <span class="ident">minute</span>: <span class="number">26</span>, <span class="ident">second</span>: <span class="number">40</span>, <span class="ident">nanosecond</span>: <span class="number">12_345_678</span>, <span class="ident">offset</span>: <span class="number">0</span>),
                   <span class="ident">ymdhmsn</span>(<span class="number">2014</span>,<span class="number">12</span>,<span class="number">31</span>, <span class="number">4</span>,<span class="number">26</span>,<span class="number">40</span>,<span class="number">12_345_678</span>, <span class="number">0</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">year</span>: <span class="number">2014</span>, <span class="ident">ordinal</span>: <span class="number">365</span>, <span class="ident">hour_div_12</span>: <span class="number">1</span>, <span class="ident">hour_mod_12</span>: <span class="number">1</span>,
                          <span class="ident">minute</span>: <span class="number">26</span>, <span class="ident">second</span>: <span class="number">40</span>, <span class="ident">nanosecond</span>: <span class="number">12_345_678</span>, <span class="ident">offset</span>: <span class="number">32400</span>),
                   <span class="ident">ymdhmsn</span>(<span class="number">2014</span>,<span class="number">12</span>,<span class="number">31</span>, <span class="number">13</span>,<span class="number">26</span>,<span class="number">40</span>,<span class="number">12_345_678</span>, <span class="number">32400</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">year</span>: <span class="number">2014</span>, <span class="ident">ordinal</span>: <span class="number">365</span>, <span class="ident">hour_div_12</span>: <span class="number">0</span>, <span class="ident">hour_mod_12</span>: <span class="number">1</span>,
                          <span class="ident">minute</span>: <span class="number">42</span>, <span class="ident">second</span>: <span class="number">4</span>, <span class="ident">nanosecond</span>: <span class="number">12_345_678</span>, <span class="ident">offset</span>: <span class="op">-</span><span class="number">9876</span>),
                   <span class="ident">ymdhmsn</span>(<span class="number">2014</span>,<span class="number">12</span>,<span class="number">31</span>, <span class="number">1</span>,<span class="number">42</span>,<span class="number">4</span>,<span class="number">12_345_678</span>, <span class="op">-</span><span class="number">9876</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">year</span>: <span class="number">2015</span>, <span class="ident">ordinal</span>: <span class="number">1</span>, <span class="ident">hour_div_12</span>: <span class="number">0</span>, <span class="ident">hour_mod_12</span>: <span class="number">4</span>,
                          <span class="ident">minute</span>: <span class="number">26</span>, <span class="ident">second</span>: <span class="number">40</span>, <span class="ident">nanosecond</span>: <span class="number">12_345_678</span>, <span class="ident">offset</span>: <span class="number">86400</span>),
                   <span class="prelude-val">Err</span>(<span class="ident">OUT_OF_RANGE</span>)); <span class="comment">// `FixedOffset` does not support such huge offset</span>
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">test_parsed_to_datetime_with_timezone</span>() {
        <span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">parse</span> {
            (<span class="macro-nonterminal">$</span><span class="macro-nonterminal">tz</span>:<span class="ident">expr</span>; $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">k</span>:<span class="ident">ident</span>: <span class="macro-nonterminal">$</span><span class="macro-nonterminal">v</span>:<span class="ident">expr</span>),<span class="kw-2">*</span>) <span class="op">=&gt;</span> (
                <span class="ident">Parsed</span> { $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">k</span>: <span class="prelude-val">Some</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">v</span>),)<span class="op">*</span> ..<span class="ident">Parsed</span>::<span class="ident">new</span>() }.<span class="ident">to_datetime_with_timezone</span>(<span class="kw-2">&amp;</span><span class="macro-nonterminal">$</span><span class="macro-nonterminal">tz</span>)
            )
        }

        <span class="comment">// single result from ymdhms</span>
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">UTC</span>;
                          <span class="ident">year</span>: <span class="number">2014</span>, <span class="ident">ordinal</span>: <span class="number">365</span>, <span class="ident">hour_div_12</span>: <span class="number">0</span>, <span class="ident">hour_mod_12</span>: <span class="number">4</span>,
                          <span class="ident">minute</span>: <span class="number">26</span>, <span class="ident">second</span>: <span class="number">40</span>, <span class="ident">nanosecond</span>: <span class="number">12_345_678</span>, <span class="ident">offset</span>: <span class="number">0</span>),
                   <span class="prelude-val">Ok</span>(<span class="ident">UTC</span>.<span class="ident">ymd</span>(<span class="number">2014</span>, <span class="number">12</span>, <span class="number">31</span>).<span class="ident">and_hms_nano</span>(<span class="number">4</span>, <span class="number">26</span>, <span class="number">40</span>, <span class="number">12_345_678</span>)));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">UTC</span>;
                          <span class="ident">year</span>: <span class="number">2014</span>, <span class="ident">ordinal</span>: <span class="number">365</span>, <span class="ident">hour_div_12</span>: <span class="number">1</span>, <span class="ident">hour_mod_12</span>: <span class="number">1</span>,
                          <span class="ident">minute</span>: <span class="number">26</span>, <span class="ident">second</span>: <span class="number">40</span>, <span class="ident">nanosecond</span>: <span class="number">12_345_678</span>, <span class="ident">offset</span>: <span class="number">32400</span>),
                   <span class="prelude-val">Err</span>(<span class="ident">IMPOSSIBLE</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">FixedOffset</span>::<span class="ident">east</span>(<span class="number">32400</span>);
                          <span class="ident">year</span>: <span class="number">2014</span>, <span class="ident">ordinal</span>: <span class="number">365</span>, <span class="ident">hour_div_12</span>: <span class="number">0</span>, <span class="ident">hour_mod_12</span>: <span class="number">4</span>,
                          <span class="ident">minute</span>: <span class="number">26</span>, <span class="ident">second</span>: <span class="number">40</span>, <span class="ident">nanosecond</span>: <span class="number">12_345_678</span>, <span class="ident">offset</span>: <span class="number">0</span>),
                   <span class="prelude-val">Err</span>(<span class="ident">IMPOSSIBLE</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">FixedOffset</span>::<span class="ident">east</span>(<span class="number">32400</span>);
                          <span class="ident">year</span>: <span class="number">2014</span>, <span class="ident">ordinal</span>: <span class="number">365</span>, <span class="ident">hour_div_12</span>: <span class="number">1</span>, <span class="ident">hour_mod_12</span>: <span class="number">1</span>,
                          <span class="ident">minute</span>: <span class="number">26</span>, <span class="ident">second</span>: <span class="number">40</span>, <span class="ident">nanosecond</span>: <span class="number">12_345_678</span>, <span class="ident">offset</span>: <span class="number">32400</span>),
                   <span class="prelude-val">Ok</span>(<span class="ident">FixedOffset</span>::<span class="ident">east</span>(<span class="number">32400</span>).<span class="ident">ymd</span>(<span class="number">2014</span>, <span class="number">12</span>, <span class="number">31</span>)
                                              .<span class="ident">and_hms_nano</span>(<span class="number">13</span>, <span class="number">26</span>, <span class="number">40</span>, <span class="number">12_345_678</span>)));

        <span class="comment">// single result from timestamp</span>
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">UTC</span>; <span class="ident">timestamp</span>: <span class="number">1_420_000_000</span>, <span class="ident">offset</span>: <span class="number">0</span>),
                   <span class="prelude-val">Ok</span>(<span class="ident">UTC</span>.<span class="ident">ymd</span>(<span class="number">2014</span>, <span class="number">12</span>, <span class="number">31</span>).<span class="ident">and_hms</span>(<span class="number">4</span>, <span class="number">26</span>, <span class="number">40</span>)));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">UTC</span>; <span class="ident">timestamp</span>: <span class="number">1_420_000_000</span>, <span class="ident">offset</span>: <span class="number">32400</span>),
                   <span class="prelude-val">Err</span>(<span class="ident">IMPOSSIBLE</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">FixedOffset</span>::<span class="ident">east</span>(<span class="number">32400</span>); <span class="ident">timestamp</span>: <span class="number">1_420_000_000</span>, <span class="ident">offset</span>: <span class="number">0</span>),
                   <span class="prelude-val">Err</span>(<span class="ident">IMPOSSIBLE</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">parse</span><span class="macro">!</span>(<span class="ident">FixedOffset</span>::<span class="ident">east</span>(<span class="number">32400</span>); <span class="ident">timestamp</span>: <span class="number">1_420_000_000</span>, <span class="ident">offset</span>: <span class="number">32400</span>),
                   <span class="prelude-val">Ok</span>(<span class="ident">FixedOffset</span>::<span class="ident">east</span>(<span class="number">32400</span>).<span class="ident">ymd</span>(<span class="number">2014</span>, <span class="number">12</span>, <span class="number">31</span>).<span class="ident">and_hms</span>(<span class="number">13</span>, <span class="number">26</span>, <span class="number">40</span>)));

        <span class="comment">// TODO test with a variable time zone (for None and Ambiguous cases)</span>
    }
}

</pre>
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