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</pre><pre class="rust ">
<span class="attribute">#<span class="op">!</span>[<span class="ident">allow</span>(<span class="ident">missing_docs</span>)]</span>
<span class="kw">use</span> <span class="ident">alsa</span>;
<span class="kw">use</span> <span class="ident">png</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">convert</span>::<span class="ident">From</span>;
<span class="kw">use</span> <span class="ident">std</span>;
<span class="kw">use</span> <span class="ident">toml</span>;
<span class="macro">error_chain</span><span class="macro">!</span> {
<span class="ident">foreign_links</span> {
<span class="ident">Alsa</span>(<span class="ident">alsa</span>::<span class="ident">Error</span>);
<span class="ident">IO</span>(<span class="ident">std</span>::<span class="ident">io</span>::<span class="ident">Error</span>);
<span class="ident">Toml</span>(<span class="ident">toml</span>::<span class="ident">de</span>::<span class="ident">Error</span>);
<span class="ident">Png</span>(<span class="ident">png</span>::<span class="ident">DecodingError</span>);
}
}
<span class="attribute">#[<span class="ident">macro_export</span>]</span>
<span class="doccomment">/// Try to unwrap a `Result&lt;T, E&gt;`. If there is a value `T`, yield it,</span>
<span class="doccomment">/// otherwise print a warning and `return ()` from the function.</span>
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">try_w</span> {
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">expr</span>:<span class="ident">expr</span>) <span class="op">=&gt;</span> {
<span class="macro">try_wr</span><span class="macro">!</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">expr</span>, ())
};
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">expr</span>:<span class="ident">expr</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">fmt</span>:<span class="ident">expr</span>, $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">arg</span>:<span class="ident">tt</span>)<span class="op">+</span>) <span class="op">=&gt;</span> {
<span class="macro">try_wr</span><span class="macro">!</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">expr</span>, (), <span class="macro-nonterminal">$</span><span class="macro-nonterminal">fmt</span>, $(<span class="ident">arg</span>)<span class="op">+</span>)
};
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">expr</span>:<span class="ident">expr</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">fmt</span>:<span class="ident">expr</span>) <span class="op">=&gt;</span> {
<span class="macro">try_wr</span><span class="macro">!</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">expr</span>, (), <span class="macro-nonterminal">$</span><span class="macro-nonterminal">fmt</span>)
}
}
<span class="attribute">#[<span class="ident">macro_export</span>]</span>
<span class="doccomment">/// Try to unwrap a `Result&lt;T, E&gt;`. If there is a value `T`, yield it,</span>
<span class="doccomment">/// otherwise print a warning and return from the function with the given value.</span>
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">try_wr</span> {
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">expr</span>:<span class="ident">expr</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">ret</span>:<span class="ident">expr</span>) <span class="op">=&gt;</span> (<span class="kw">match</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">expr</span> {
::<span class="ident">std</span>::<span class="ident">result</span>::<span class="prelude-ty">Result</span>::<span class="prelude-val">Ok</span>(<span class="ident">val</span>) <span class="op">=&gt;</span> <span class="ident">val</span>,
::<span class="ident">std</span>::<span class="ident">result</span>::<span class="prelude-ty">Result</span>::<span class="prelude-val">Err</span>(<span class="ident">err</span>) <span class="op">=&gt;</span> {
<span class="macro">warn</span><span class="macro">!</span>(<span class="string">&quot;{:?}&quot;</span>, <span class="ident">err</span>);
<span class="kw">return</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">ret</span>;
},
});
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">expr</span>:<span class="ident">expr</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">ret</span>:<span class="ident">expr</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">fmt</span>:<span class="ident">expr</span>) <span class="op">=&gt;</span> (<span class="kw">match</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">expr</span> {
::<span class="ident">std</span>::<span class="ident">result</span>::<span class="prelude-ty">Result</span>::<span class="prelude-val">Ok</span>(<span class="ident">val</span>) <span class="op">=&gt;</span> <span class="ident">val</span>,
::<span class="ident">std</span>::<span class="ident">result</span>::<span class="prelude-ty">Result</span>::<span class="prelude-val">Err</span>(<span class="ident">err</span>) <span class="op">=&gt;</span> {
<span class="macro">warn</span><span class="macro">!</span>(<span class="string">&quot;Original error: {:?}&quot;</span>, <span class="ident">err</span>);
<span class="macro">warn</span><span class="macro">!</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">fmt</span>);
<span class="kw">return</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">ret</span>;
},
});
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">expr</span>:<span class="ident">expr</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">ret</span>:<span class="ident">expr</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">fmt</span>:<span class="ident">expr</span>, $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">arg</span>:<span class="ident">tt</span>)<span class="op">+</span>) <span class="op">=&gt;</span> (<span class="kw">match</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">expr</span> {
::<span class="ident">std</span>::<span class="ident">result</span>::<span class="prelude-ty">Result</span>::<span class="prelude-val">Ok</span>(<span class="ident">val</span>) <span class="op">=&gt;</span> <span class="ident">val</span>,
::<span class="ident">std</span>::<span class="ident">result</span>::<span class="prelude-ty">Result</span>::<span class="prelude-val">Err</span>(<span class="ident">err</span>) <span class="op">=&gt;</span> {
<span class="macro">warn</span><span class="macro">!</span>(<span class="string">&quot;Original error: {:?}&quot;</span>, <span class="ident">err</span>);
<span class="macro">warn</span><span class="macro">!</span>(<span class="macro">format</span><span class="macro">!</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">fmt</span>, $(<span class="ident">arg</span>)<span class="op">+</span>));
<span class="kw">return</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">ret</span>;
},
})
}
<span class="attribute">#[<span class="ident">macro_export</span>]</span>
<span class="doccomment">/// Try to unwrap a `Result&lt;T, E&gt;`. If there is a value `T`, yield it,</span>
<span class="doccomment">/// otherwise return from the function with the given value.</span>
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">try_r</span> {
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">expr</span>:<span class="ident">expr</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">ret</span>:<span class="ident">expr</span>) <span class="op">=&gt;</span> (<span class="kw">match</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">expr</span> {
::<span class="ident">std</span>::<span class="ident">result</span>::<span class="prelude-ty">Result</span>::<span class="prelude-val">Ok</span>(<span class="ident">val</span>) <span class="op">=&gt;</span> <span class="ident">val</span>,
::<span class="ident">std</span>::<span class="ident">result</span>::<span class="prelude-ty">Result</span>::<span class="prelude-val">Err</span>(_) <span class="op">=&gt;</span> {
<span class="kw">return</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">ret</span>;
},
});
}
<span class="attribute">#[<span class="ident">macro_export</span>]</span>
<span class="doccomment">/// Try to unwrap a `Result&lt;T, E&gt;`. If there is a value `T`, yield it,</span>
<span class="doccomment">/// otherwise print an error and exit the program.</span>
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">try_e</span> {
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">expr</span>:<span class="ident">expr</span>) <span class="op">=&gt;</span> (<span class="kw">match</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">expr</span> {
::<span class="ident">std</span>::<span class="ident">result</span>::<span class="prelude-ty">Result</span>::<span class="prelude-val">Ok</span>(<span class="ident">val</span>) <span class="op">=&gt;</span> <span class="ident">val</span>,
::<span class="ident">std</span>::<span class="ident">result</span>::<span class="prelude-ty">Result</span>::<span class="prelude-val">Err</span>(<span class="ident">err</span>) <span class="op">=&gt;</span> {
<span class="macro">error</span><span class="macro">!</span>(<span class="string">&quot;{:?}&quot;</span>, <span class="ident">err</span>);
::<span class="ident">std</span>::<span class="ident">process</span>::<span class="ident">exit</span>(<span class="number">1</span>);
},
});
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">expr</span>:<span class="ident">expr</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">fmt</span>:<span class="ident">expr</span>) <span class="op">=&gt;</span> (<span class="kw">match</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">expr</span> {
::<span class="ident">std</span>::<span class="ident">result</span>::<span class="prelude-ty">Result</span>::<span class="prelude-val">Ok</span>(<span class="ident">val</span>) <span class="op">=&gt;</span> <span class="ident">val</span>,
::<span class="ident">std</span>::<span class="ident">result</span>::<span class="prelude-ty">Result</span>::<span class="prelude-val">Err</span>(<span class="ident">err</span>) <span class="op">=&gt;</span> {
<span class="macro">error</span><span class="macro">!</span>(<span class="string">&quot;Original error: {:?}&quot;</span>, <span class="ident">err</span>);
<span class="macro">error</span><span class="macro">!</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">fmt</span>);
<span class="ident">std</span>::<span class="ident">process</span>::<span class="ident">exit</span>(<span class="number">1</span>);
},
});
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">expr</span>:<span class="ident">expr</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">fmt</span>:<span class="ident">expr</span>, $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">arg</span>:<span class="ident">tt</span>)<span class="op">+</span>) <span class="op">=&gt;</span> (<span class="kw">match</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">expr</span> {
::<span class="ident">std</span>::<span class="ident">result</span>::<span class="prelude-ty">Result</span>::<span class="prelude-val">Ok</span>(<span class="ident">val</span>) <span class="op">=&gt;</span> <span class="ident">val</span>,
::<span class="ident">std</span>::<span class="ident">result</span>::<span class="prelude-ty">Result</span>::<span class="prelude-val">Err</span>(<span class="ident">err</span>) <span class="op">=&gt;</span> {
<span class="macro">error</span><span class="macro">!</span>(<span class="string">&quot;Original error: {:?}&quot;</span>, <span class="ident">err</span>);
<span class="macro">error</span><span class="macro">!</span>(<span class="macro">format</span><span class="macro">!</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">fmt</span>, $(<span class="ident">arg</span>)<span class="op">+</span>));
<span class="ident">std</span>::<span class="ident">process</span>::<span class="ident">exit</span>(<span class="number">1</span>);
},
})
}
</pre>
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