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<pre><code><span class="attribute">#</span><span class="attribute">[</span><span class="attribute">derive</span><span class="attribute">(</span><span class="attribute">Clone</span><span class="attribute">,</span><span class="attribute"> </span><span class="attribute">Debug</span><span class="attribute">)</span><span class="attribute">]</span>
<span class="keyword">struct</span> <span class="struct declaration">Foo</span> {
    <span class="keyword">pub</span> <span class="field declaration">x</span>: <span class="builtin_type">i32</span>,
    <span class="keyword">pub</span> <span class="field declaration">y</span>: <span class="builtin_type">i32</span>,
}

<span class="keyword">fn</span> <span class="function declaration">foo</span>&lt;<span class="lifetime declaration">'a</span>, <span class="type_param declaration">T</span>&gt;() -&gt; <span class="type_param">T</span> {
    <span class="function">foo</span>::&lt;<span class="lifetime">'a</span>, <span class="builtin_type">i32</span>&gt;()
}

<span class="macro">macro_rules</span><span class="macro">!</span> def_fn {
    ($($tt:tt)*) =&gt; {$($tt)*}
}

<span class="macro">def_fn</span><span class="macro">!</span> {
    <span class="keyword">fn</span> <span class="function declaration">bar</span>() -&gt; <span class="builtin_type">u32</span> {
        <span class="numeric_literal">100</span>
    }
}

<span class="comment">// comment</span>
<span class="keyword">fn</span> <span class="function declaration">main</span>() {
    <span class="macro">println</span><span class="macro">!</span>(<span class="string_literal">"Hello, {}!"</span>, <span class="numeric_literal">92</span>);

    <span class="keyword">let</span> <span class="keyword">mut</span> <span class="variable declaration mutable">vec</span> = Vec::new();
    <span class="keyword control">if</span> <span class="keyword">true</span> {
        <span class="keyword">let</span> <span class="variable declaration">x</span> = <span class="numeric_literal">92</span>;
        <span class="variable mutable">vec</span>.push(<span class="struct">Foo</span> { <span class="field">x</span>, <span class="field">y</span>: <span class="numeric_literal">1</span> });
    }
    <span class="keyword unsafe">unsafe</span> { <span class="variable mutable">vec</span>.set_len(<span class="numeric_literal">0</span>); }

    <span class="keyword">let</span> <span class="keyword">mut</span> <span class="variable declaration mutable">x</span> = <span class="numeric_literal">42</span>;
    <span class="keyword">let</span> <span class="variable declaration mutable">y</span> = &<span class="keyword">mut</span> <span class="variable mutable">x</span>;
    <span class="keyword">let</span> <span class="variable declaration">z</span> = &<span class="variable mutable">y</span>;

    <span class="variable mutable">y</span>;
}

<span class="keyword">enum</span> <span class="enum declaration">Option</span>&lt;<span class="type_param declaration">T</span>&gt; {
    <span class="enum_variant declaration">Some</span>(<span class="type_param">T</span>),
    <span class="enum_variant declaration">None</span>,
}
<span class="keyword">use</span> <span class="enum">Option</span>::*;

<span class="keyword">impl</span>&lt;<span class="type_param declaration">T</span>&gt; <span class="enum">Option</span>&lt;<span class="type_param">T</span>&gt; {
    <span class="keyword">fn</span> <span class="function declaration">and</span>&lt;<span class="type_param declaration">U</span>&gt;(<span class="keyword">self</span>, <span class="variable declaration">other</span>: <span class="enum">Option</span>&lt;<span class="type_param">U</span>&gt;) -&gt; <span class="enum">Option</span>&lt;(<span class="type_param">T</span>, <span class="type_param">U</span>)&gt; {
        <span class="keyword control">match</span> <span class="variable">other</span> {
            <span class="enum_variant">None</span> =&gt; <span class="macro">unimplemented</span><span class="macro">!</span>(),
            <span class="variable declaration">Nope</span> =&gt; <span class="variable">Nope</span>,
        }
    }
}</code></pre>