4 pre { color: #DCDCCC; background: #3F3F3F; font-size: 22px; padding: 0.4em; }
6 .lifetime { color: #DFAF8F; font-style: italic; }
7 .label { color: #DFAF8F; font-style: italic; }
8 .comment { color: #7F9F7F; }
9 .documentation { color: #629755; }
10 .intra_doc_link { font-style: italic; }
11 .injected { opacity: 0.65 ; }
12 .struct, .enum { color: #7CB8BB; }
13 .enum_variant { color: #BDE0F3; }
14 .string_literal { color: #CC9393; }
15 .field { color: #94BFF3; }
16 .function { color: #93E0E3; }
17 .function.unsafe { color: #BC8383; }
18 .trait.unsafe { color: #BC8383; }
19 .operator.unsafe { color: #BC8383; }
20 .mutable.unsafe { color: #BC8383; text-decoration: underline; }
21 .keyword.unsafe { color: #BC8383; font-weight: bold; }
22 .parameter { color: #94BFF3; }
23 .text { color: #DCDCCC; }
24 .type { color: #7CB8BB; }
25 .builtin_type { color: #8CD0D3; }
26 .type_param { color: #DFAF8F; }
27 .attribute { color: #94BFF3; }
28 .numeric_literal { color: #BFEBBF; }
29 .bool_literal { color: #BFE6EB; }
30 .macro { color: #94BFF3; }
31 .module { color: #AFD8AF; }
32 .value_param { color: #DCDCCC; }
33 .variable { color: #DCDCCC; }
34 .format_specifier { color: #CC696B; }
35 .mutable { text-decoration: underline; }
36 .escape_sequence { color: #94BFF3; }
37 .keyword { color: #F0DFAF; font-weight: bold; }
38 .control { font-style: italic; }
39 .reference { font-style: italic; font-weight: bold; }
41 .unresolved_reference { color: #FC5555; text-decoration: wavy underline; }
43 <pre><code><span class="keyword">use</span> <span class="module">inner</span><span class="operator">::</span><span class="brace">{</span><span class="self_keyword">self</span> <span class="keyword">as</span> <span class="module declaration">inner_mod</span><span class="brace">}</span><span class="semicolon">;</span>
44 <span class="keyword">mod</span> <span class="module declaration">inner</span> <span class="brace">{</span><span class="brace">}</span>
46 <span class="attribute_bracket attribute">#</span><span class="attribute_bracket attribute">[</span><span class="builtin_attr attribute library">allow</span><span class="parenthesis attribute">(</span><span class="parenthesis attribute">)</span><span class="attribute_bracket attribute">]</span>
47 <span class="attribute_bracket attribute">#</span><span class="attribute_bracket attribute">[</span><span class="module attribute crate_root library">proc_macros</span><span class="operator attribute">::</span><span class="macro attribute library">identity</span><span class="attribute_bracket attribute">]</span>
48 <span class="keyword">pub</span> <span class="keyword">mod</span> <span class="module declaration public">ops</span> <span class="brace">{</span>
49 <span class="attribute_bracket attribute">#</span><span class="attribute_bracket attribute">[</span><span class="builtin_attr attribute library">lang</span> <span class="operator attribute">=</span> <span class="string_literal attribute">"fn_once"</span><span class="attribute_bracket attribute">]</span>
50 <span class="keyword">pub</span> <span class="keyword">trait</span> <span class="trait declaration public">FnOnce</span><span class="angle"><</span><span class="type_param declaration">Args</span><span class="angle">></span> <span class="brace">{</span><span class="brace">}</span>
52 <span class="attribute_bracket attribute">#</span><span class="attribute_bracket attribute">[</span><span class="builtin_attr attribute library">lang</span> <span class="operator attribute">=</span> <span class="string_literal attribute">"fn_mut"</span><span class="attribute_bracket attribute">]</span>
53 <span class="keyword">pub</span> <span class="keyword">trait</span> <span class="trait declaration public">FnMut</span><span class="angle"><</span><span class="type_param declaration">Args</span><span class="angle">></span><span class="colon">:</span> <span class="trait public">FnOnce</span><span class="angle"><</span><span class="type_param">Args</span><span class="angle">></span> <span class="brace">{</span><span class="brace">}</span>
55 <span class="attribute_bracket attribute">#</span><span class="attribute_bracket attribute">[</span><span class="builtin_attr attribute library">lang</span> <span class="operator attribute">=</span> <span class="string_literal attribute">"fn"</span><span class="attribute_bracket attribute">]</span>
56 <span class="keyword">pub</span> <span class="keyword">trait</span> <span class="trait declaration public">Fn</span><span class="angle"><</span><span class="type_param declaration">Args</span><span class="angle">></span><span class="colon">:</span> <span class="trait public">FnMut</span><span class="angle"><</span><span class="type_param">Args</span><span class="angle">></span> <span class="brace">{</span><span class="brace">}</span>
57 <span class="brace">}</span>
59 proc_macros::<span class="macro">mirror!</span> <span class="brace">{</span>
60 <span class="brace">{</span>
61 <span class="comma">,</span><span class="builtin_type">i32</span> <span class="colon">:</span><span class="field declaration public">x</span> <span class="keyword">pub</span>
62 <span class="comma">,</span><span class="builtin_type">i32</span> <span class="colon">:</span><span class="field declaration public">y</span> <span class="keyword">pub</span>
63 <span class="brace">}</span> <span class="struct declaration">Foo</span> <span class="keyword">struct</span>
64 <span class="brace">}</span>
66 <span class="keyword">trait</span> <span class="trait declaration">Bar</span> <span class="keyword">where</span> <span class="type_param">Self</span><span class="colon">:</span> <span class="brace">{</span>
67 <span class="keyword">fn</span> <span class="function associated declaration reference trait">bar</span><span class="parenthesis">(</span><span class="operator">&</span><span class="self_keyword declaration reference">self</span><span class="parenthesis">)</span> <span class="operator">-></span> <span class="builtin_type">i32</span><span class="semicolon">;</span>
68 <span class="brace">}</span>
70 <span class="keyword">impl</span> <span class="trait">Bar</span> <span class="keyword">for</span> <span class="struct">Foo</span> <span class="keyword">where</span> <span class="self_type">Self</span><span class="colon">:</span> <span class="brace">{</span>
71 <span class="keyword">fn</span> <span class="function associated declaration reference trait">bar</span><span class="parenthesis">(</span><span class="operator">&</span><span class="self_keyword declaration reference">self</span><span class="parenthesis">)</span> <span class="operator">-></span> <span class="builtin_type">i32</span> <span class="brace">{</span>
72 <span class="self_keyword reference">self</span><span class="operator">.</span><span class="field public">x</span>
73 <span class="brace">}</span>
74 <span class="brace">}</span>
76 <span class="keyword">impl</span> <span class="struct">Foo</span> <span class="brace">{</span>
77 <span class="keyword">fn</span> <span class="function associated consuming declaration">baz</span><span class="parenthesis">(</span><span class="keyword">mut</span> <span class="self_keyword declaration mutable">self</span><span class="comma">,</span> <span class="value_param declaration">f</span><span class="colon">:</span> <span class="struct">Foo</span><span class="parenthesis">)</span> <span class="operator">-></span> <span class="builtin_type">i32</span> <span class="brace">{</span>
78 <span class="value_param">f</span><span class="operator">.</span><span class="function associated consuming">baz</span><span class="parenthesis">(</span><span class="self_keyword consuming mutable">self</span><span class="parenthesis">)</span>
79 <span class="brace">}</span>
81 <span class="keyword">fn</span> <span class="function associated declaration mutable reference">qux</span><span class="parenthesis">(</span><span class="operator">&</span><span class="keyword">mut</span> <span class="self_keyword declaration mutable reference">self</span><span class="parenthesis">)</span> <span class="brace">{</span>
82 <span class="self_keyword mutable reference">self</span><span class="operator">.</span><span class="field public">x</span> <span class="operator">=</span> <span class="numeric_literal">0</span><span class="semicolon">;</span>
83 <span class="brace">}</span>
85 <span class="keyword">fn</span> <span class="function associated declaration reference">quop</span><span class="parenthesis">(</span><span class="operator">&</span><span class="self_keyword declaration reference">self</span><span class="parenthesis">)</span> <span class="operator">-></span> <span class="builtin_type">i32</span> <span class="brace">{</span>
86 <span class="self_keyword reference">self</span><span class="operator">.</span><span class="field public">x</span>
87 <span class="brace">}</span>
88 <span class="brace">}</span>
90 <span class="attribute_bracket attribute">#</span><span class="attribute_bracket attribute">[</span><span class="macro attribute default_library library">derive</span><span class="parenthesis attribute">(</span><span class="macro attribute default_library library">Copy</span><span class="parenthesis attribute">)</span><span class="attribute_bracket attribute">]</span>
91 <span class="keyword">struct</span> <span class="struct declaration">FooCopy</span> <span class="brace">{</span>
92 <span class="field declaration">x</span><span class="colon">:</span> <span class="builtin_type">u32</span><span class="comma">,</span>
93 <span class="brace">}</span>
95 <span class="keyword">impl</span> <span class="struct">FooCopy</span> <span class="brace">{</span>
96 <span class="keyword">fn</span> <span class="function associated consuming declaration">baz</span><span class="parenthesis">(</span><span class="self_keyword declaration">self</span><span class="comma">,</span> <span class="value_param declaration">f</span><span class="colon">:</span> <span class="struct">FooCopy</span><span class="parenthesis">)</span> <span class="operator">-></span> <span class="builtin_type">u32</span> <span class="brace">{</span>
97 <span class="value_param">f</span><span class="operator">.</span><span class="function associated">baz</span><span class="parenthesis">(</span><span class="self_keyword">self</span><span class="parenthesis">)</span>
98 <span class="brace">}</span>
100 <span class="keyword">fn</span> <span class="function associated declaration mutable reference">qux</span><span class="parenthesis">(</span><span class="operator">&</span><span class="keyword">mut</span> <span class="self_keyword declaration mutable reference">self</span><span class="parenthesis">)</span> <span class="brace">{</span>
101 <span class="self_keyword mutable reference">self</span><span class="operator">.</span><span class="field">x</span> <span class="operator">=</span> <span class="numeric_literal">0</span><span class="semicolon">;</span>
102 <span class="brace">}</span>
104 <span class="keyword">fn</span> <span class="function associated declaration reference">quop</span><span class="parenthesis">(</span><span class="operator">&</span><span class="self_keyword declaration reference">self</span><span class="parenthesis">)</span> <span class="operator">-></span> <span class="builtin_type">u32</span> <span class="brace">{</span>
105 <span class="self_keyword reference">self</span><span class="operator">.</span><span class="field">x</span>
106 <span class="brace">}</span>
107 <span class="brace">}</span>
109 <span class="keyword">fn</span> <span class="function declaration">str</span><span class="parenthesis">(</span><span class="parenthesis">)</span> <span class="brace">{</span>
110 <span class="function">str</span><span class="parenthesis">(</span><span class="parenthesis">)</span><span class="semicolon">;</span>
111 <span class="brace">}</span>
113 <span class="keyword">fn</span> <span class="function declaration">foo</span><span class="angle"><</span><span class="lifetime declaration">'a</span><span class="comma">,</span> <span class="type_param declaration">T</span><span class="angle">></span><span class="parenthesis">(</span><span class="parenthesis">)</span> <span class="operator">-></span> <span class="type_param">T</span> <span class="brace">{</span>
114 <span class="function">foo</span><span class="operator">::</span><span class="angle"><</span><span class="lifetime">'a</span><span class="comma">,</span> <span class="builtin_type">i32</span><span class="angle">></span><span class="parenthesis">(</span><span class="parenthesis">)</span>
115 <span class="brace">}</span>
117 <span class="keyword">fn</span> <span class="function declaration">never</span><span class="parenthesis">(</span><span class="parenthesis">)</span> <span class="operator">-></span> <span class="builtin_type">!</span> <span class="brace">{</span>
118 <span class="keyword control">loop</span> <span class="brace">{</span><span class="brace">}</span>
119 <span class="brace">}</span>
121 <span class="keyword">fn</span> <span class="function declaration">const_param</span><span class="angle"><</span><span class="keyword">const</span> <span class="const_param declaration">FOO</span><span class="colon">:</span> <span class="builtin_type">usize</span><span class="angle">></span><span class="parenthesis">(</span><span class="parenthesis">)</span> <span class="operator">-></span> <span class="builtin_type">usize</span> <span class="brace">{</span>
122 <span class="const_param">FOO</span>
123 <span class="brace">}</span>
125 <span class="keyword">use</span> <span class="module public">ops</span><span class="operator">::</span><span class="trait public">Fn</span><span class="semicolon">;</span>
126 <span class="keyword">fn</span> <span class="function declaration">baz</span><span class="angle"><</span><span class="type_param declaration">F</span><span class="colon">:</span> <span class="trait public">Fn</span><span class="parenthesis">(</span><span class="parenthesis">)</span> <span class="operator">-></span> <span class="parenthesis">(</span><span class="parenthesis">)</span><span class="angle">></span><span class="parenthesis">(</span><span class="value_param callable declaration">f</span><span class="colon">:</span> <span class="type_param">F</span><span class="parenthesis">)</span> <span class="brace">{</span>
127 <span class="value_param callable">f</span><span class="parenthesis">(</span><span class="parenthesis">)</span>
128 <span class="brace">}</span>
130 <span class="keyword">fn</span> <span class="function declaration">foobar</span><span class="parenthesis">(</span><span class="parenthesis">)</span> <span class="operator">-></span> <span class="keyword">impl</span> <span class="trait default_library library">Copy</span> <span class="brace">{</span><span class="brace">}</span>
132 <span class="keyword">fn</span> <span class="function declaration">foo</span><span class="parenthesis">(</span><span class="parenthesis">)</span> <span class="brace">{</span>
133 <span class="keyword">let</span> <span class="variable declaration">bar</span> <span class="operator">=</span> <span class="function">foobar</span><span class="parenthesis">(</span><span class="parenthesis">)</span><span class="semicolon">;</span>
134 <span class="brace">}</span>
136 <span class="keyword">macro_rules</span><span class="punctuation">!</span> <span class="macro declaration">def_fn</span> <span class="brace">{</span>
137 <span class="parenthesis">(</span><span class="punctuation">$</span><span class="parenthesis">(</span><span class="punctuation">$</span>tt<span class="colon">:</span>tt<span class="parenthesis">)</span><span class="punctuation">*</span><span class="parenthesis">)</span> <span class="operator">=</span><span class="angle">></span> <span class="brace">{</span><span class="punctuation">$</span><span class="parenthesis">(</span><span class="punctuation">$</span>tt<span class="parenthesis">)</span><span class="punctuation">*</span><span class="brace">}</span>
138 <span class="brace">}</span>
140 <span class="macro">def_fn!</span> <span class="brace">{</span>
141 <span class="keyword">fn</span> <span class="function declaration">bar</span><span class="parenthesis">(</span><span class="parenthesis">)</span> <span class="operator">-</span><span class="operator">></span> <span class="builtin_type">u32</span> <span class="brace">{</span>
142 <span class="numeric_literal">100</span>
143 <span class="brace">}</span>
144 <span class="brace">}</span>
146 <span class="keyword">macro_rules</span><span class="punctuation">!</span> <span class="macro declaration">dont_color_me_braces</span> <span class="brace">{</span>
147 <span class="parenthesis">(</span><span class="parenthesis">)</span> <span class="operator">=</span><span class="angle">></span> <span class="brace">{</span><span class="numeric_literal">0</span><span class="brace">}</span>
148 <span class="brace">}</span>
150 <span class="keyword">macro_rules</span><span class="punctuation">!</span> <span class="macro declaration">noop</span> <span class="brace">{</span>
151 <span class="parenthesis">(</span><span class="punctuation">$</span>expr<span class="colon">:</span>expr<span class="parenthesis">)</span> <span class="operator">=</span><span class="angle">></span> <span class="brace">{</span>
152 <span class="punctuation">$</span>expr
153 <span class="brace">}</span>
154 <span class="brace">}</span>
156 <span class="keyword">macro_rules</span><span class="punctuation">!</span> <span class="macro declaration">keyword_frag</span> <span class="brace">{</span>
157 <span class="parenthesis">(</span><span class="punctuation">$</span>type<span class="colon">:</span>ty<span class="parenthesis">)</span> <span class="operator">=</span><span class="angle">></span> <span class="parenthesis">(</span><span class="punctuation">$</span>type<span class="parenthesis">)</span>
158 <span class="brace">}</span>
160 <span class="keyword">macro</span> <span class="macro declaration">with_args</span><span class="parenthesis">(</span><span class="punctuation">$</span>i<span class="colon">:</span>ident<span class="parenthesis">)</span> <span class="brace">{</span>
161 <span class="punctuation">$</span>i
162 <span class="brace">}</span>
164 <span class="keyword">macro</span> <span class="macro declaration">without_args</span> <span class="brace">{</span>
165 <span class="parenthesis">(</span><span class="punctuation">$</span>i<span class="colon">:</span>ident<span class="parenthesis">)</span> <span class="operator">=</span><span class="angle">></span> <span class="brace">{</span>
166 <span class="punctuation">$</span>i
167 <span class="brace">}</span>
168 <span class="brace">}</span>
170 <span class="comment">// comment</span>
171 <span class="keyword">fn</span> <span class="function declaration">main</span><span class="parenthesis">(</span><span class="parenthesis">)</span> <span class="brace">{</span>
172 <span class="macro">println!</span><span class="parenthesis">(</span><span class="string_literal">"Hello, {}!"</span><span class="comma">,</span> <span class="numeric_literal">92</span><span class="parenthesis">)</span><span class="semicolon">;</span>
173 <span class="macro">dont_color_me_braces!</span><span class="parenthesis">(</span><span class="parenthesis">)</span><span class="semicolon">;</span>
175 <span class="keyword">let</span> <span class="keyword">mut</span> <span class="variable declaration mutable">vec</span> <span class="operator">=</span> <span class="unresolved_reference">Vec</span><span class="operator">::</span><span class="unresolved_reference">new</span><span class="parenthesis">(</span><span class="parenthesis">)</span><span class="semicolon">;</span>
176 <span class="keyword control">if</span> <span class="bool_literal">true</span> <span class="brace">{</span>
177 <span class="keyword">let</span> <span class="variable declaration">x</span> <span class="operator">=</span> <span class="numeric_literal">92</span><span class="semicolon">;</span>
178 <span class="variable mutable">vec</span><span class="operator">.</span><span class="unresolved_reference">push</span><span class="parenthesis">(</span><span class="struct">Foo</span> <span class="brace">{</span> <span class="field">x</span><span class="comma">,</span> <span class="field public">y</span><span class="colon">:</span> <span class="numeric_literal">1</span> <span class="brace">}</span><span class="parenthesis">)</span><span class="semicolon">;</span>
179 <span class="brace">}</span>
181 <span class="keyword control">for</span> <span class="variable declaration">e</span> <span class="keyword control">in</span> <span class="variable mutable">vec</span> <span class="brace">{</span>
182 <span class="comment">// Do nothing</span>
183 <span class="brace">}</span>
185 <span class="macro">noop!</span><span class="parenthesis">(</span><span class="macro">noop</span><span class="macro">!</span><span class="parenthesis">(</span><span class="numeric_literal">1</span><span class="parenthesis">)</span><span class="parenthesis">)</span><span class="semicolon">;</span>
187 <span class="keyword">let</span> <span class="keyword">mut</span> <span class="variable declaration mutable">x</span> <span class="operator">=</span> <span class="numeric_literal">42</span><span class="semicolon">;</span>
188 <span class="variable mutable">x</span> <span class="arithmetic mutable">+=</span> <span class="numeric_literal">1</span><span class="semicolon">;</span>
189 <span class="keyword">let</span> <span class="variable declaration mutable reference">y</span> <span class="operator">=</span> <span class="operator">&</span><span class="keyword">mut</span> <span class="variable mutable">x</span><span class="semicolon">;</span>
190 <span class="keyword">let</span> <span class="variable declaration reference">z</span> <span class="operator">=</span> <span class="operator">&</span><span class="variable mutable reference">y</span><span class="semicolon">;</span>
192 <span class="keyword">let</span> <span class="struct">Foo</span> <span class="brace">{</span> <span class="field public">x</span><span class="colon">:</span> <span class="variable declaration">z</span><span class="comma">,</span> <span class="field">y</span> <span class="brace">}</span> <span class="operator">=</span> <span class="struct">Foo</span> <span class="brace">{</span> <span class="field public">x</span><span class="colon">:</span> <span class="variable reference">z</span><span class="comma">,</span> <span class="field">y</span> <span class="brace">}</span><span class="semicolon">;</span>
194 <span class="variable">y</span><span class="semicolon">;</span>
196 <span class="keyword">let</span> <span class="keyword">mut</span> <span class="variable declaration mutable">foo</span> <span class="operator">=</span> <span class="struct">Foo</span> <span class="brace">{</span> <span class="field">x</span><span class="comma">,</span> <span class="field public">y</span><span class="colon">:</span> <span class="variable mutable">x</span> <span class="brace">}</span><span class="semicolon">;</span>
197 <span class="keyword">let</span> <span class="variable declaration">foo2</span> <span class="operator">=</span> <span class="struct">Foo</span> <span class="brace">{</span> <span class="field">x</span><span class="comma">,</span> <span class="field public">y</span><span class="colon">:</span> <span class="variable mutable">x</span> <span class="brace">}</span><span class="semicolon">;</span>
198 <span class="variable mutable">foo</span><span class="operator">.</span><span class="function associated reference">quop</span><span class="parenthesis">(</span><span class="parenthesis">)</span><span class="semicolon">;</span>
199 <span class="variable mutable">foo</span><span class="operator">.</span><span class="function associated mutable reference">qux</span><span class="parenthesis">(</span><span class="parenthesis">)</span><span class="semicolon">;</span>
200 <span class="variable mutable">foo</span><span class="operator">.</span><span class="function associated consuming">baz</span><span class="parenthesis">(</span><span class="variable consuming">foo2</span><span class="parenthesis">)</span><span class="semicolon">;</span>
202 <span class="keyword">let</span> <span class="keyword">mut</span> <span class="variable declaration mutable">copy</span> <span class="operator">=</span> <span class="struct">FooCopy</span> <span class="brace">{</span> <span class="field">x</span> <span class="brace">}</span><span class="semicolon">;</span>
203 <span class="variable mutable">copy</span><span class="operator">.</span><span class="function associated reference">quop</span><span class="parenthesis">(</span><span class="parenthesis">)</span><span class="semicolon">;</span>
204 <span class="variable mutable">copy</span><span class="operator">.</span><span class="function associated mutable reference">qux</span><span class="parenthesis">(</span><span class="parenthesis">)</span><span class="semicolon">;</span>
205 <span class="variable mutable">copy</span><span class="operator">.</span><span class="function associated">baz</span><span class="parenthesis">(</span><span class="variable mutable">copy</span><span class="parenthesis">)</span><span class="semicolon">;</span>
207 <span class="keyword">let</span> <span class="variable callable declaration">a</span> <span class="operator">=</span> <span class="punctuation">|</span><span class="value_param declaration">x</span><span class="punctuation">|</span> <span class="value_param">x</span><span class="semicolon">;</span>
208 <span class="keyword">let</span> <span class="variable callable declaration">bar</span> <span class="operator">=</span> <span class="struct">Foo</span><span class="operator">::</span><span class="function associated consuming">baz</span><span class="semicolon">;</span>
210 <span class="keyword">let</span> <span class="variable declaration">baz</span> <span class="operator">=</span> <span class="parenthesis">(</span><span class="numeric_literal">-</span><span class="numeric_literal">42</span><span class="comma">,</span><span class="parenthesis">)</span><span class="semicolon">;</span>
211 <span class="keyword">let</span> <span class="variable declaration">baz</span> <span class="operator">=</span> <span class="operator">-</span><span class="variable">baz</span><span class="operator">.</span><span class="field">0</span><span class="semicolon">;</span>
213 <span class="keyword">let</span> <span class="punctuation">_</span> <span class="operator">=</span> <span class="logical">!</span><span class="bool_literal">true</span><span class="semicolon">;</span>
215 <span class="label declaration">'foo</span><span class="colon">:</span> <span class="keyword control">loop</span> <span class="brace">{</span>
216 <span class="keyword control">break</span> <span class="label">'foo</span><span class="semicolon">;</span>
217 <span class="keyword control">continue</span> <span class="label">'foo</span><span class="semicolon">;</span>
218 <span class="brace">}</span>
219 <span class="brace">}</span>
221 <span class="keyword">enum</span> <span class="enum declaration">Option</span><span class="angle"><</span><span class="type_param declaration">T</span><span class="angle">></span> <span class="brace">{</span>
222 <span class="enum_variant declaration">Some</span><span class="parenthesis">(</span><span class="type_param">T</span><span class="parenthesis">)</span><span class="comma">,</span>
223 <span class="enum_variant declaration">None</span><span class="comma">,</span>
224 <span class="brace">}</span>
225 <span class="keyword">use</span> <span class="enum">Option</span><span class="operator">::</span><span class="punctuation">*</span><span class="semicolon">;</span>
227 <span class="keyword">impl</span><span class="angle"><</span><span class="type_param declaration">T</span><span class="angle">></span> <span class="enum">Option</span><span class="angle"><</span><span class="type_param">T</span><span class="angle">></span> <span class="brace">{</span>
228 <span class="keyword">fn</span> <span class="function associated consuming declaration">and</span><span class="angle"><</span><span class="type_param declaration">U</span><span class="angle">></span><span class="parenthesis">(</span><span class="self_keyword declaration">self</span><span class="comma">,</span> <span class="value_param declaration">other</span><span class="colon">:</span> <span class="enum">Option</span><span class="angle"><</span><span class="type_param">U</span><span class="angle">></span><span class="parenthesis">)</span> <span class="operator">-></span> <span class="enum">Option</span><span class="angle"><</span><span class="parenthesis">(</span><span class="type_param">T</span><span class="comma">,</span> <span class="type_param">U</span><span class="parenthesis">)</span><span class="angle">></span> <span class="brace">{</span>
229 <span class="keyword control">match</span> <span class="value_param">other</span> <span class="brace">{</span>
230 <span class="enum_variant">None</span> <span class="operator">=></span> <span class="macro">unimplemented!</span><span class="parenthesis">(</span><span class="parenthesis">)</span><span class="comma">,</span>
231 <span class="variable declaration">Nope</span> <span class="operator">=></span> <span class="variable">Nope</span><span class="comma">,</span>
232 <span class="brace">}</span>
233 <span class="brace">}</span>
234 <span class="brace">}</span>
236 <span class="keyword async">async</span> <span class="keyword">fn</span> <span class="function async declaration">learn_and_sing</span><span class="parenthesis">(</span><span class="parenthesis">)</span> <span class="brace">{</span>
237 <span class="keyword">let</span> <span class="variable declaration">song</span> <span class="operator">=</span> <span class="unresolved_reference">learn_song</span><span class="parenthesis">(</span><span class="parenthesis">)</span><span class="operator">.</span><span class="keyword async control">await</span><span class="semicolon">;</span>
238 <span class="unresolved_reference">sing_song</span><span class="parenthesis">(</span><span class="variable consuming">song</span><span class="parenthesis">)</span><span class="operator">.</span><span class="keyword async control">await</span><span class="semicolon">;</span>
239 <span class="brace">}</span>
241 <span class="keyword async">async</span> <span class="keyword">fn</span> <span class="function async declaration">async_main</span><span class="parenthesis">(</span><span class="parenthesis">)</span> <span class="brace">{</span>
242 <span class="keyword">let</span> <span class="variable declaration">f1</span> <span class="operator">=</span> <span class="function async">learn_and_sing</span><span class="parenthesis">(</span><span class="parenthesis">)</span><span class="semicolon">;</span>
243 <span class="keyword">let</span> <span class="variable declaration">f2</span> <span class="operator">=</span> <span class="unresolved_reference">dance</span><span class="parenthesis">(</span><span class="parenthesis">)</span><span class="semicolon">;</span>
244 futures::<span class="macro">join!</span><span class="parenthesis">(</span>f1<span class="comma">,</span> f2<span class="parenthesis">)</span><span class="semicolon">;</span>
245 <span class="brace">}</span>
247 <span class="keyword">fn</span> <span class="function declaration">use_foo_items</span><span class="parenthesis">(</span><span class="parenthesis">)</span> <span class="brace">{</span>
248 <span class="keyword">let</span> <span class="variable declaration">bob</span> <span class="operator">=</span> <span class="module crate_root library">foo</span><span class="operator">::</span><span class="struct library">Person</span> <span class="brace">{</span>
249 <span class="field library">name</span><span class="colon">:</span> <span class="string_literal">"Bob"</span><span class="comma">,</span>
250 <span class="field library">age</span><span class="colon">:</span> <span class="module crate_root library">foo</span><span class="operator">::</span><span class="module library">consts</span><span class="operator">::</span><span class="constant library">NUMBER</span><span class="comma">,</span>
251 <span class="brace">}</span><span class="semicolon">;</span>
253 <span class="keyword">let</span> <span class="variable declaration">control_flow</span> <span class="operator">=</span> <span class="module crate_root library">foo</span><span class="operator">::</span><span class="function library">identity</span><span class="parenthesis">(</span><span class="module crate_root library">foo</span><span class="operator">::</span><span class="enum library">ControlFlow</span><span class="operator">::</span><span class="enum_variant library">Continue</span><span class="parenthesis">)</span><span class="semicolon">;</span>
255 <span class="keyword control">if</span> <span class="variable">control_flow</span><span class="operator">.</span><span class="function associated consuming library">should_die</span><span class="parenthesis">(</span><span class="parenthesis">)</span> <span class="brace">{</span>
256 foo::<span class="macro">die!</span><span class="parenthesis">(</span><span class="parenthesis">)</span><span class="semicolon">;</span>
257 <span class="brace">}</span>
258 <span class="brace">}</span>
260 <span class="keyword">pub</span> <span class="keyword">enum</span> <span class="enum declaration public">Bool</span> <span class="brace">{</span> <span class="enum_variant declaration public">True</span><span class="comma">,</span> <span class="enum_variant declaration public">False</span> <span class="brace">}</span>
262 <span class="keyword">impl</span> <span class="enum public">Bool</span> <span class="brace">{</span>
263 <span class="keyword">pub</span> <span class="keyword">const</span> <span class="keyword">fn</span> <span class="function associated consuming declaration public">to_primitive</span><span class="parenthesis">(</span><span class="self_keyword declaration">self</span><span class="parenthesis">)</span> <span class="operator">-></span> <span class="builtin_type">bool</span> <span class="brace">{</span>
264 <span class="macro">matches!</span><span class="parenthesis">(</span>self<span class="comma">,</span> Self<span class="colon">:</span><span class="colon">:</span>True<span class="parenthesis">)</span>
265 <span class="brace">}</span>
266 <span class="brace">}</span>
267 <span class="keyword">const</span> <span class="constant declaration">USAGE_OF_BOOL</span><span class="colon">:</span><span class="builtin_type">bool</span> <span class="operator">=</span> <span class="enum public">Bool</span><span class="operator">::</span><span class="enum_variant public">True</span><span class="operator">.</span><span class="function associated consuming public">to_primitive</span><span class="parenthesis">(</span><span class="parenthesis">)</span><span class="semicolon">;</span>
269 <span class="keyword">trait</span> <span class="trait declaration">Baz</span> <span class="brace">{</span>
270 <span class="keyword">type</span> <span class="type_alias associated declaration trait">Qux</span><span class="semicolon">;</span>
271 <span class="brace">}</span>
273 <span class="keyword">fn</span> <span class="function declaration">baz</span><span class="angle"><</span><span class="type_param declaration">T</span><span class="angle">></span><span class="parenthesis">(</span><span class="value_param declaration">t</span><span class="colon">:</span> <span class="type_param">T</span><span class="parenthesis">)</span>
274 <span class="keyword">where</span>
275 <span class="type_param">T</span><span class="colon">:</span> <span class="trait">Baz</span><span class="comma">,</span>
276 <span class="angle"><</span><span class="type_param">T</span> <span class="keyword">as</span> <span class="trait">Baz</span><span class="angle">></span><span class="operator">::</span><span class="type_alias associated trait">Qux</span><span class="colon">:</span> <span class="trait">Bar</span> <span class="brace">{</span><span class="brace">}</span>