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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="type">Foo</span> {
    <span class="keyword">pub</span> <span class="field">x</span>: <span class="type.builtin">i32</span>,
    <span class="keyword">pub</span> <span class="field">y</span>: <span class="type.builtin">i32</span>,
}

<span class="keyword">fn</span> <span class="function">foo</span>&lt;<span class="type.param">T</span>&gt;() -&gt; <span class="type.param">T</span> {
    <span class="macro">unimplemented</span><span class="macro">!</span>();
    <span class="function">foo</span>::&lt;<span class="type.builtin">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">bar</span>() -&gt; <span class="type.builtin">u32</span> {
        <span class="literal.numeric">100</span>
    }
}

<span class="comment">// comment</span>
<span class="keyword">fn</span> <span class="function">main</span>() {
    <span class="macro">println</span><span class="macro">!</span>(<span class="string">"Hello, {}!"</span>, <span class="literal.numeric">92</span>);

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

    <span class="keyword">let</span> <span class="keyword">mut</span> <span class="variable.mut">x</span> = <span class="literal.numeric">42</span>;
    <span class="keyword">let</span> <span class="variable.mut">y</span> = &<span class="keyword">mut</span> <span class="variable.mut">x</span>;
    <span class="keyword">let</span> <span class="variable">z</span> = &<span class="variable.mut">y</span>;

    <span class="variable.mut">y</span>;
}

<span class="keyword">enum</span> <span class="type">E</span>&lt;<span class="type.param">X</span>&gt; {
    <span class="constant">V</span>(<span class="type.param">X</span>)
}

<span class="keyword">impl</span>&lt;<span class="type.param">X</span>&gt; <span class="type">E</span>&lt;<span class="type.param">X</span>&gt; {
    <span class="keyword">fn</span> <span class="function">new</span>&lt;<span class="type.param">T</span>&gt;() -&gt; <span class="type">E</span>&lt;<span class="type.param">T</span>&gt; {}
}</code></pre>