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</pre><pre class="rust ">
<span class="comment">// Copyright 2017 Serde Developers</span>
<span class="comment">//</span>
<span class="comment">// Licensed under the Apache License, Version 2.0 &lt;LICENSE-APACHE or</span>
<span class="comment">// http://www.apache.org/licenses/LICENSE-2.0&gt; or the MIT license</span>
<span class="comment">// &lt;LICENSE-MIT or http://opensource.org/licenses/MIT&gt;, at your</span>
<span class="comment">// option. This file may not be copied, modified, or distributed</span>
<span class="comment">// except according to those terms.</span>

<span class="doccomment">//! # Serde</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! Serde is a framework for ***ser***ializing and ***de***serializing Rust data</span>
<span class="doccomment">//! structures efficiently and generically.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! The Serde ecosystem consists of data structures that know how to serialize</span>
<span class="doccomment">//! and deserialize themselves along with data formats that know how to</span>
<span class="doccomment">//! serialize and deserialize other things. Serde provides the layer by which</span>
<span class="doccomment">//! these two groups interact with each other, allowing any supported data</span>
<span class="doccomment">//! structure to be serialized and deserialized using any supported data format.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! See the Serde website [https://serde.rs/] for additional documentation and</span>
<span class="doccomment">//! usage examples.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! [https://serde.rs/]: https://serde.rs/</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ## Design</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! Where many other languages rely on runtime reflection for serializing data,</span>
<span class="doccomment">//! Serde is instead built on Rust&#39;s powerful trait system. A data structure</span>
<span class="doccomment">//! that knows how to serialize and deserialize itself is one that implements</span>
<span class="doccomment">//! Serde&#39;s `Serialize` and `Deserialize` traits (or uses Serde&#39;s derive</span>
<span class="doccomment">//! attribute to automatically generate implementations at compile time). This</span>
<span class="doccomment">//! avoids any overhead of reflection or runtime type information. In fact in</span>
<span class="doccomment">//! many situations the interaction between data structure and data format can</span>
<span class="doccomment">//! be completely optimized away by the Rust compiler, leaving Serde</span>
<span class="doccomment">//! serialization to perform the same speed as a handwritten serializer for the</span>
<span class="doccomment">//! specific selection of data structure and data format.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ## Data formats</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! The following is a partial list of data formats that have been implemented</span>
<span class="doccomment">//! for Serde by the community.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! - [JSON], the ubiquitous JavaScript Object Notation used by many HTTP APIs.</span>
<span class="doccomment">//! - [Bincode], a compact binary format</span>
<span class="doccomment">//!   used for IPC within the Servo rendering engine.</span>
<span class="doccomment">//! - [CBOR], a Concise Binary Object Representation designed for small message</span>
<span class="doccomment">//!   size without the need for version negotiation.</span>
<span class="doccomment">//! - [YAML], a popular human-friendly configuration language that ain&#39;t markup</span>
<span class="doccomment">//!   language.</span>
<span class="doccomment">//! - [MessagePack], an efficient binary format that resembles a compact JSON.</span>
<span class="doccomment">//! - [TOML], a minimal configuration format used by [Cargo].</span>
<span class="doccomment">//! - [Pickle], a format common in the Python world.</span>
<span class="doccomment">//! - [Hjson], a variant of JSON designed to be readable and writable by humans.</span>
<span class="doccomment">//! - [BSON], the data storage and network transfer format used by MongoDB.</span>
<span class="doccomment">//! - [URL], the x-www-form-urlencoded format.</span>
<span class="doccomment">//! - [XML], the flexible machine-friendly W3C standard.</span>
<span class="doccomment">//!   *(deserialization only)*</span>
<span class="doccomment">//! - [Envy], a way to deserialize environment variables into Rust structs.</span>
<span class="doccomment">//!   *(deserialization only)*</span>
<span class="doccomment">//! - [Redis], deserialize values from Redis when using [redis-rs].</span>
<span class="doccomment">//!   *(deserialization only)*</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! [JSON]: https://github.com/serde-rs/json</span>
<span class="doccomment">//! [Bincode]: https://github.com/TyOverby/bincode</span>
<span class="doccomment">//! [CBOR]: https://github.com/pyfisch/cbor</span>
<span class="doccomment">//! [YAML]: https://github.com/dtolnay/serde-yaml</span>
<span class="doccomment">//! [MessagePack]: https://github.com/3Hren/msgpack-rust</span>
<span class="doccomment">//! [TOML]: https://github.com/alexcrichton/toml-rs</span>
<span class="doccomment">//! [Pickle]: https://github.com/birkenfeld/serde-pickle</span>
<span class="doccomment">//! [Hjson]: https://github.com/laktak/hjson-rust</span>
<span class="doccomment">//! [BSON]: https://github.com/zonyitoo/bson-rs</span>
<span class="doccomment">//! [URL]: https://github.com/nox/serde_urlencoded</span>
<span class="doccomment">//! [XML]: https://github.com/RReverser/serde-xml-rs</span>
<span class="doccomment">//! [Envy]: https://github.com/softprops/envy</span>
<span class="doccomment">//! [Redis]: https://github.com/OneSignal/serde-redis</span>
<span class="doccomment">//! [Cargo]: http://doc.crates.io/manifest.html</span>
<span class="doccomment">//! [redis-rs]: https://crates.io/crates/redis</span>

<span class="comment">////////////////////////////////////////////////////////////////////////////////</span>

<span class="comment">// Serde types in rustdoc of other crates get linked to here.</span>
<span class="attribute">#<span class="op">!</span>[<span class="ident">doc</span>(<span class="ident">html_root_url</span> <span class="op">=</span> <span class="string">&quot;https://docs.rs/serde/1.0.10&quot;</span>)]</span>

<span class="comment">// Support using Serde without the standard library!</span>
<span class="attribute">#<span class="op">!</span>[<span class="ident">cfg_attr</span>(<span class="ident">not</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;std&quot;</span>), <span class="ident">no_std</span>)]</span>

<span class="comment">// Unstable functionality only if the user asks for it. For tracking and</span>
<span class="comment">// discussion of these features please refer to this issue:</span>
<span class="comment">//</span>
<span class="comment">//    https://github.com/serde-rs/serde/issues/812</span>
<span class="attribute">#<span class="op">!</span>[<span class="ident">cfg_attr</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;unstable&quot;</span>, <span class="ident">feature</span>(<span class="ident">nonzero</span>, <span class="ident">specialization</span>))]</span>
<span class="attribute">#<span class="op">!</span>[<span class="ident">cfg_attr</span>(<span class="ident">all</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;std&quot;</span>, <span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;unstable&quot;</span>), <span class="ident">feature</span>(<span class="ident">into_boxed_c_str</span>))]</span>
<span class="attribute">#<span class="op">!</span>[<span class="ident">cfg_attr</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;alloc&quot;</span>, <span class="ident">feature</span>(<span class="ident">alloc</span>))]</span>

<span class="comment">// Whitelisted clippy lints.</span>
<span class="attribute">#<span class="op">!</span>[<span class="ident">cfg_attr</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;cargo-clippy&quot;</span>, <span class="ident">allow</span>(<span class="ident">doc_markdown</span>))]</span>
<span class="attribute">#<span class="op">!</span>[<span class="ident">cfg_attr</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;cargo-clippy&quot;</span>, <span class="ident">allow</span>(<span class="ident">linkedlist</span>))]</span>
<span class="attribute">#<span class="op">!</span>[<span class="ident">cfg_attr</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;cargo-clippy&quot;</span>, <span class="ident">allow</span>(<span class="ident">type_complexity</span>))]</span>
<span class="attribute">#<span class="op">!</span>[<span class="ident">cfg_attr</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;cargo-clippy&quot;</span>, <span class="ident">allow</span>(<span class="ident">zero_prefixed_literal</span>))]</span>

<span class="comment">// Blacklisted Rust lints.</span>
<span class="attribute">#<span class="op">!</span>[<span class="ident">deny</span>(<span class="ident">missing_docs</span>, <span class="ident">unused_imports</span>)]</span>

<span class="comment">////////////////////////////////////////////////////////////////////////////////</span>

<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;alloc&quot;</span>)]</span>
<span class="kw">extern</span> <span class="kw">crate</span> <span class="ident">alloc</span>;

<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">all</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;unstable&quot;</span>, <span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;std&quot;</span>))]</span>
<span class="kw">extern</span> <span class="kw">crate</span> <span class="ident">core</span>;

<span class="doccomment">/// A facade around all the types we need from the `std`, `core`, and `alloc`</span>
<span class="doccomment">/// crates. This avoids elaborate import wrangling having to happen in every</span>
<span class="doccomment">/// module.</span>
<span class="kw">mod</span> <span class="ident">lib</span> {
    <span class="kw">mod</span> <span class="ident">core</span> {
        <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;std&quot;</span>)]</span>
        <span class="kw">pub</span> <span class="kw">use</span> <span class="ident">std</span>::<span class="kw-2">*</span>;
        <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">not</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;std&quot;</span>))]</span>
        <span class="kw">pub</span> <span class="kw">use</span> <span class="ident">core</span>::<span class="kw-2">*</span>;
    }

    <span class="kw">pub</span> <span class="kw">use</span> <span class="self">self</span>::<span class="ident">core</span>::{<span class="ident">cmp</span>, <span class="ident">iter</span>, <span class="ident">mem</span>, <span class="ident">ops</span>, <span class="ident">slice</span>, <span class="ident">str</span>};
    <span class="kw">pub</span> <span class="kw">use</span> <span class="self">self</span>::<span class="ident">core</span>::{<span class="ident">i8</span>, <span class="ident">i16</span>, <span class="ident">i32</span>, <span class="ident">i64</span>, <span class="ident">isize</span>};
    <span class="kw">pub</span> <span class="kw">use</span> <span class="self">self</span>::<span class="ident">core</span>::{<span class="ident">u8</span>, <span class="ident">u16</span>, <span class="ident">u32</span>, <span class="ident">u64</span>, <span class="ident">usize</span>};
    <span class="kw">pub</span> <span class="kw">use</span> <span class="self">self</span>::<span class="ident">core</span>::{<span class="ident">f32</span>, <span class="ident">f64</span>};

    <span class="kw">pub</span> <span class="kw">use</span> <span class="self">self</span>::<span class="ident">core</span>::<span class="ident">cell</span>::{<span class="ident">Cell</span>, <span class="ident">RefCell</span>};
    <span class="kw">pub</span> <span class="kw">use</span> <span class="self">self</span>::<span class="ident">core</span>::<span class="ident">clone</span>::{<span class="self">self</span>, <span class="ident">Clone</span>};
    <span class="kw">pub</span> <span class="kw">use</span> <span class="self">self</span>::<span class="ident">core</span>::<span class="ident">convert</span>::{<span class="self">self</span>, <span class="ident">From</span>, <span class="ident">Into</span>};
    <span class="kw">pub</span> <span class="kw">use</span> <span class="self">self</span>::<span class="ident">core</span>::<span class="ident">default</span>::{<span class="self">self</span>, <span class="ident">Default</span>};
    <span class="kw">pub</span> <span class="kw">use</span> <span class="self">self</span>::<span class="ident">core</span>::<span class="ident">fmt</span>::{<span class="self">self</span>, <span class="ident">Debug</span>, <span class="ident">Display</span>};
    <span class="kw">pub</span> <span class="kw">use</span> <span class="self">self</span>::<span class="ident">core</span>::<span class="ident">marker</span>::{<span class="self">self</span>, <span class="ident">PhantomData</span>};
    <span class="kw">pub</span> <span class="kw">use</span> <span class="self">self</span>::<span class="ident">core</span>::<span class="ident">option</span>::{<span class="self">self</span>, <span class="prelude-ty">Option</span>};
    <span class="kw">pub</span> <span class="kw">use</span> <span class="self">self</span>::<span class="ident">core</span>::<span class="ident">result</span>::{<span class="self">self</span>, <span class="prelude-ty">Result</span>};

    <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;std&quot;</span>)]</span>
    <span class="kw">pub</span> <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">borrow</span>::{<span class="ident">Cow</span>, <span class="ident">ToOwned</span>};
    <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">all</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;alloc&quot;</span>, <span class="ident">not</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;std&quot;</span>)))]</span>
    <span class="kw">pub</span> <span class="kw">use</span> <span class="ident">alloc</span>::<span class="ident">borrow</span>::{<span class="ident">Cow</span>, <span class="ident">ToOwned</span>};

    <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;std&quot;</span>)]</span>
    <span class="kw">pub</span> <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">string</span>::<span class="ident">String</span>;
    <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">all</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;alloc&quot;</span>, <span class="ident">not</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;std&quot;</span>)))]</span>
    <span class="kw">pub</span> <span class="kw">use</span> <span class="ident">alloc</span>::<span class="ident">string</span>::{<span class="ident">String</span>, <span class="ident">ToString</span>};

    <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;std&quot;</span>)]</span>
    <span class="kw">pub</span> <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">vec</span>::<span class="ident">Vec</span>;
    <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">all</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;alloc&quot;</span>, <span class="ident">not</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;std&quot;</span>)))]</span>
    <span class="kw">pub</span> <span class="kw">use</span> <span class="ident">alloc</span>::<span class="ident">vec</span>::<span class="ident">Vec</span>;

    <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;std&quot;</span>)]</span>
    <span class="kw">pub</span> <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">boxed</span>::<span class="ident">Box</span>;
    <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">all</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;alloc&quot;</span>, <span class="ident">not</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;std&quot;</span>)))]</span>
    <span class="kw">pub</span> <span class="kw">use</span> <span class="ident">alloc</span>::<span class="ident">boxed</span>::<span class="ident">Box</span>;

    <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">all</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;rc&quot;</span>, <span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;std&quot;</span>))]</span>
    <span class="kw">pub</span> <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">rc</span>::<span class="ident">Rc</span>;
    <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">all</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;rc&quot;</span>, <span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;alloc&quot;</span>, <span class="ident">not</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;std&quot;</span>)))]</span>
    <span class="kw">pub</span> <span class="kw">use</span> <span class="ident">alloc</span>::<span class="ident">rc</span>::<span class="ident">Rc</span>;

    <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">all</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;rc&quot;</span>, <span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;std&quot;</span>))]</span>
    <span class="kw">pub</span> <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">sync</span>::<span class="ident">Arc</span>;
    <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">all</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;rc&quot;</span>, <span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;alloc&quot;</span>, <span class="ident">not</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;std&quot;</span>)))]</span>
    <span class="kw">pub</span> <span class="kw">use</span> <span class="ident">alloc</span>::<span class="ident">arc</span>::<span class="ident">Arc</span>;

    <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;std&quot;</span>)]</span>
    <span class="kw">pub</span> <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">collections</span>::{<span class="ident">BinaryHeap</span>, <span class="ident">BTreeMap</span>, <span class="ident">BTreeSet</span>, <span class="ident">LinkedList</span>, <span class="ident">VecDeque</span>};
    <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">all</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;alloc&quot;</span>, <span class="ident">not</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;std&quot;</span>)))]</span>
    <span class="kw">pub</span> <span class="kw">use</span> <span class="ident">alloc</span>::{<span class="ident">BinaryHeap</span>, <span class="ident">BTreeMap</span>, <span class="ident">BTreeSet</span>, <span class="ident">LinkedList</span>, <span class="ident">VecDeque</span>};

    <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;std&quot;</span>)]</span>
    <span class="kw">pub</span> <span class="kw">use</span> <span class="ident">std</span>::{<span class="ident">error</span>, <span class="ident">net</span>};

    <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;std&quot;</span>)]</span>
    <span class="kw">pub</span> <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">collections</span>::{<span class="ident">HashMap</span>, <span class="ident">HashSet</span>};
    <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;std&quot;</span>)]</span>
    <span class="kw">pub</span> <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">ffi</span>::{<span class="ident">CString</span>, <span class="ident">CStr</span>, <span class="ident">OsString</span>, <span class="ident">OsStr</span>};
    <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;std&quot;</span>)]</span>
    <span class="kw">pub</span> <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">hash</span>::{<span class="ident">Hash</span>, <span class="ident">BuildHasher</span>};
    <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;std&quot;</span>)]</span>
    <span class="kw">pub</span> <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">io</span>::<span class="ident">Write</span>;
    <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;std&quot;</span>)]</span>
    <span class="kw">pub</span> <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">path</span>::{<span class="ident">Path</span>, <span class="ident">PathBuf</span>};
    <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;std&quot;</span>)]</span>
    <span class="kw">pub</span> <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">time</span>::{<span class="ident">Duration</span>, <span class="ident">SystemTime</span>, <span class="ident">UNIX_EPOCH</span>};
    <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;std&quot;</span>)]</span>
    <span class="kw">pub</span> <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">sync</span>::{<span class="ident">Mutex</span>, <span class="ident">RwLock</span>};

    <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;unstable&quot;</span>)]</span>
    <span class="kw">pub</span> <span class="kw">use</span> <span class="ident">core</span>::<span class="ident">nonzero</span>::{<span class="ident">NonZero</span>, <span class="ident">Zeroable</span>};
}

<span class="comment">////////////////////////////////////////////////////////////////////////////////</span>

<span class="attribute">#[<span class="ident">macro_use</span>]</span>
<span class="kw">mod</span> <span class="ident">macros</span>;

<span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">ser</span>;
<span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">de</span>;

<span class="attribute">#[<span class="ident">doc</span>(<span class="ident">inline</span>)]</span>
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">ser</span>::{<span class="ident">Serialize</span>, <span class="ident">Serializer</span>};
<span class="attribute">#[<span class="ident">doc</span>(<span class="ident">inline</span>)]</span>
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">de</span>::{<span class="ident">Deserialize</span>, <span class="ident">Deserializer</span>};

<span class="comment">// Generated code uses these to support no_std. Not public API.</span>
<span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span>
<span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">export</span>;

<span class="comment">// Helpers used by generated code and doc tests. Not public API.</span>
<span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span>
<span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">private</span>;

<span class="comment">// Re-export #[derive(Serialize, Deserialize)].</span>
<span class="comment">//</span>
<span class="comment">// This is a workaround for https://github.com/rust-lang/cargo/issues/1286.</span>
<span class="comment">// Without this re-export, crates that put Serde derives behind a cfg_attr would</span>
<span class="comment">// need to use some silly feature name that depends on both serde and</span>
<span class="comment">// serde_derive.</span>
<span class="comment">//</span>
<span class="comment">//     [features]</span>
<span class="comment">//     serde-impls = [&quot;serde&quot;, &quot;serde_derive&quot;]</span>
<span class="comment">//</span>
<span class="comment">//     [dependencies]</span>
<span class="comment">//     serde = { version = &quot;1.0&quot;, optional = true }</span>
<span class="comment">//     serde_derive = { version = &quot;1.0&quot;, optional = true }</span>
<span class="comment">//</span>
<span class="comment">//     # Used like this:</span>
<span class="comment">//     # #[cfg(feature = &quot;serde-impls&quot;)]</span>
<span class="comment">//     # #[macro_use]</span>
<span class="comment">//     # extern crate serde_derive;</span>
<span class="comment">//     #</span>
<span class="comment">//     # #[cfg_attr(feature = &quot;serde-impls&quot;, derive(Serialize, Deserialize))]</span>
<span class="comment">//     # struct S { /* ... */ }</span>
<span class="comment">//</span>
<span class="comment">// The re-exported derives allow crates to use &quot;serde&quot; as the name of their</span>
<span class="comment">// Serde feature which is more intuitive.</span>
<span class="comment">//</span>
<span class="comment">//     [dependencies]</span>
<span class="comment">//     serde = { version = &quot;1.0&quot;, optional = true, features = [&quot;derive&quot;] }</span>
<span class="comment">//</span>
<span class="comment">//     # Used like this:</span>
<span class="comment">//     # #[cfg(feature = &quot;serde&quot;)]</span>
<span class="comment">//     # #[macro_use]</span>
<span class="comment">//     # extern crate serde;</span>
<span class="comment">//     #</span>
<span class="comment">//     # #[cfg_attr(feature = &quot;serde&quot;, derive(Serialize, Deserialize))]</span>
<span class="comment">//     # struct S { /* ... */ }</span>
<span class="comment">//</span>
<span class="comment">// The reason re-exporting is not enabled by default is that disabling it would</span>
<span class="comment">// be annoying for crates that provide handwritten impls or data formats. They</span>
<span class="comment">// would need to disable default features and then explicitly re-enable std.</span>
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;serde_derive&quot;</span>)]</span>
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">unused_imports</span>)]</span>
<span class="attribute">#[<span class="ident">macro_use</span>]</span>
<span class="kw">extern</span> <span class="kw">crate</span> <span class="ident">serde_derive</span>;
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;serde_derive&quot;</span>)]</span>
<span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span>
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">serde_derive</span>::<span class="kw-2">*</span>;
</pre>
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