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<pre><code><span class="keyword">struct</span> <span class="struct declaration">Foo</span> {
    <span class="field declaration">bar</span>: <span class="builtin_type">bool</span>,
}

<span class="keyword">impl</span> <span class="struct">Foo</span> {
    <span class="keyword">pub</span> <span class="keyword">const</span> <span class="constant declaration">bar</span>: <span class="builtin_type">bool</span> = <span class="bool_literal">true</span>;

    <span class="comment documentation">/// Constructs a new `Foo`.</span>
    <span class="comment documentation">///</span>
    <span class="comment documentation">/// # Examples</span>
    <span class="comment documentation">///</span>
    <span class="comment documentation">/// ```</span>
    <span class="comment documentation">/// #</span> <span class="attribute">#![</span><span class="function attribute">allow</span><span class="attribute">(unused_mut)]</span>
    <span class="comment documentation">/// </span><span class="keyword">let</span> <span class="keyword">mut</span> <span class="variable declaration mutable">foo</span>: <span class="struct">Foo</span> = <span class="struct">Foo</span>::<span class="function">new</span>();
    <span class="comment documentation">/// ```</span>
    <span class="keyword">pub</span> <span class="keyword">const</span> <span class="keyword">fn</span> <span class="function declaration">new</span>() -&gt; <span class="struct">Foo</span> {
        <span class="struct">Foo</span> { <span class="field">bar</span>: <span class="bool_literal">true</span> }
    }

    <span class="comment documentation">/// `bar` method on `Foo`.</span>
    <span class="comment documentation">///</span>
    <span class="comment documentation">/// # Examples</span>
    <span class="comment documentation">///</span>
    <span class="comment documentation">/// ```</span>
    <span class="comment documentation">/// </span><span class="keyword">use</span> <span class="module">x</span>::<span class="module">y</span>;
    <span class="comment documentation">///</span>
    <span class="comment documentation">/// </span><span class="keyword">let</span> <span class="variable declaration">foo</span> = <span class="struct">Foo</span>::<span class="function">new</span>();
    <span class="comment documentation">///</span>
    <span class="comment documentation">/// </span><span class="comment">// calls bar on foo</span>
    <span class="comment documentation">/// </span><span class="macro">assert!</span>(foo.bar());
    <span class="comment documentation">///</span>
    <span class="comment documentation">/// </span><span class="keyword">let</span> <span class="variable declaration">bar</span> = <span class="variable">foo</span>.<span class="field">bar</span> || <span class="struct">Foo</span>::<span class="constant">bar</span>;
    <span class="comment documentation">///</span>
    <span class="comment documentation">/// </span><span class="comment">/* multi-line
    </span><span class="comment documentation">/// </span><span class="comment">       comment */</span>
    <span class="comment documentation">///</span>
    <span class="comment documentation">/// </span><span class="keyword">let</span> <span class="variable declaration">multi_line_string</span> = <span class="string_literal">"Foo
    </span><span class="comment documentation">/// </span><span class="string_literal">  bar
    </span><span class="comment documentation">/// </span><span class="string_literal">         "</span>;
    <span class="comment documentation">///</span>
    <span class="comment documentation">/// ```</span>
    <span class="comment documentation">///</span>
    <span class="comment documentation">/// ```rust,no_run</span>
    <span class="comment documentation">/// </span><span class="keyword">let</span> <span class="variable declaration">foobar</span> = <span class="struct">Foo</span>::<span class="function">new</span>().<span class="function">bar</span>();
    <span class="comment documentation">/// ```</span>
    <span class="comment documentation">///</span>
    <span class="comment documentation">/// ```sh</span>
    <span class="comment documentation">/// echo 1</span>
    <span class="comment documentation">/// ```</span>
    <span class="keyword">pub</span> <span class="keyword">fn</span> <span class="function declaration">foo</span>(&<span class="self_keyword">self</span>) -&gt; <span class="builtin_type">bool</span> {
        <span class="bool_literal">true</span>
    }
}

<span class="comment documentation">/// ```</span>
<span class="comment documentation">/// </span><span class="macro">noop!</span>(<span class="numeric_literal">1</span>);
<span class="comment documentation">/// ```</span>
<span class="macro">macro_rules!</span> <span class="macro declaration">noop</span> {
    ($expr:expr) =&gt; {
        $expr
    }
}</code></pre>