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<div class="section-content top-matter">
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<h1 id='async-without-await' class='heading'>Async Without Await</h1>
|
||
|
||
<p>Declaration should not be async if it doesn’t use await</p>
|
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|
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<ul>
|
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<li><strong>Identifier:</strong> <code>async_without_await</code></li>
|
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<li><strong>Enabled by default:</strong> No</li>
|
||
<li><strong>Supports autocorrection:</strong> Yes</li>
|
||
<li><strong>Kind:</strong> lint</li>
|
||
<li><strong>Analyzer rule:</strong> No</li>
|
||
<li><strong>Minimum Swift compiler version:</strong> 5.0.0</li>
|
||
<li><strong>Default configuration:</strong>
|
||
<table>
|
||
<thead>
|
||
<tr><th>Key</th><th>Value</th></tr>
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||
</thead>
|
||
<tbody>
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||
<tr>
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<td>
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severity
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</td>
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||
<td>
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warning
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||
</td>
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||
</tr>
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</tbody>
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</table></li>
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</ul>
|
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<h2 id='non-triggering-examples' class='heading'>Non Triggering Examples</h2>
|
||
<pre class="highlight swift"><code><span class="kd">func</span> <span class="nf">test</span><span class="p">()</span> <span class="p">{</span>
|
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<span class="kd">func</span> <span class="nf">test</span><span class="p">()</span> <span class="k">async</span> <span class="p">{</span>
|
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<span class="k">await</span> <span class="nf">test</span><span class="p">()</span>
|
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<span class="p">}</span>
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<span class="p">},</span>
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||
</code></pre>
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||
<pre class="highlight swift"><code><span class="kd">func</span> <span class="nf">test</span><span class="p">()</span> <span class="p">{</span>
|
||
<span class="kd">func</span> <span class="nf">test</span><span class="p">()</span> <span class="k">async</span> <span class="p">{</span>
|
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<span class="k">await</span> <span class="nf">test</span><span class="p">()</span><span class="o">.</span><span class="n">value</span>
|
||
<span class="p">}</span>
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<span class="p">},</span>
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||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="kd">func</span> <span class="nf">test</span><span class="p">()</span> <span class="k">async</span> <span class="p">{</span>
|
||
<span class="k">await</span> <span class="n">scheduler</span><span class="o">.</span><span class="n">task</span> <span class="p">{</span> <span class="n">foo</span> <span class="p">{</span> <span class="nf">bar</span><span class="p">()</span> <span class="p">}</span> <span class="p">}</span>
|
||
<span class="p">}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="kd">func</span> <span class="nf">test</span><span class="p">()</span> <span class="k">async</span> <span class="p">{</span>
|
||
<span class="nf">perform</span><span class="p">(</span><span class="k">await</span> <span class="k">try</span> <span class="nf">foo</span><span class="p">()</span><span class="o">.</span><span class="n">value</span><span class="p">)</span>
|
||
<span class="p">}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="kd">func</span> <span class="nf">test</span><span class="p">()</span> <span class="k">async</span> <span class="p">{</span>
|
||
<span class="nf">perform</span><span class="p">(</span><span class="k">try</span> <span class="k">await</span> <span class="nf">foo</span><span class="p">())</span>
|
||
<span class="p">}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="kd">func</span> <span class="nf">test</span><span class="p">()</span> <span class="k">async</span> <span class="p">{</span>
|
||
<span class="k">await</span> <span class="nf">perform</span><span class="p">()</span>
|
||
<span class="kd">func</span> <span class="nf">baz</span><span class="p">()</span> <span class="p">{</span>
|
||
<span class="nf">qux</span><span class="p">()</span>
|
||
<span class="p">}</span>
|
||
<span class="p">}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="k">let</span> <span class="nv">x</span><span class="p">:</span> <span class="p">()</span> <span class="k">async</span> <span class="o">-></span> <span class="kt">Void</span> <span class="o">=</span> <span class="p">{</span>
|
||
<span class="k">await</span> <span class="nf">test</span><span class="p">()</span>
|
||
<span class="p">}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="k">let</span> <span class="nv">x</span><span class="p">:</span> <span class="p">()</span> <span class="k">async</span> <span class="o">-></span> <span class="kt">Void</span> <span class="o">=</span> <span class="p">{</span>
|
||
<span class="k">await</span> <span class="p">{</span> <span class="k">await</span> <span class="nf">test</span><span class="p">()</span> <span class="p">}()</span>
|
||
<span class="p">}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="kd">func</span> <span class="nf">test</span><span class="p">()</span> <span class="k">async</span> <span class="p">{</span>
|
||
<span class="k">await</span> <span class="nf">foo</span><span class="p">()</span>
|
||
<span class="p">}</span>
|
||
<span class="k">let</span> <span class="nv">x</span> <span class="o">=</span> <span class="p">{</span> <span class="nf">bar</span><span class="p">()</span> <span class="p">}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="k">let</span> <span class="nv">x</span><span class="p">:</span> <span class="p">(()</span> <span class="k">async</span> <span class="o">-></span> <span class="kt">Void</span><span class="p">)?</span> <span class="o">=</span> <span class="p">{</span>
|
||
<span class="k">await</span> <span class="p">{</span> <span class="k">await</span> <span class="nf">test</span><span class="p">()</span> <span class="p">}()</span>
|
||
<span class="p">}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="k">let</span> <span class="nv">x</span><span class="p">:</span> <span class="p">(()</span> <span class="k">async</span> <span class="o">-></span> <span class="kt">Void</span><span class="p">)?</span> <span class="o">=</span> <span class="kc">nil</span>
|
||
<span class="k">let</span> <span class="nv">x</span><span class="p">:</span> <span class="p">()</span> <span class="o">-></span> <span class="kt">Void</span> <span class="o">=</span> <span class="p">{</span> <span class="nf">test</span><span class="p">()</span> <span class="p">}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="k">var</span> <span class="nv">test</span><span class="p">:</span> <span class="kt">Int</span> <span class="p">{</span>
|
||
<span class="k">get</span> <span class="k">async</span> <span class="k">throws</span> <span class="p">{</span>
|
||
<span class="k">try</span> <span class="k">await</span> <span class="nf">foo</span><span class="p">()</span>
|
||
<span class="p">}</span>
|
||
<span class="p">}</span>
|
||
<span class="k">var</span> <span class="nv">foo</span><span class="p">:</span> <span class="kt">Int</span> <span class="p">{</span>
|
||
<span class="k">get</span> <span class="k">throws</span> <span class="p">{</span>
|
||
<span class="k">try</span> <span class="nf">bar</span><span class="p">()</span>
|
||
<span class="p">}</span>
|
||
<span class="p">}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="nf">init</span><span class="p">()</span> <span class="k">async</span> <span class="p">{</span>
|
||
<span class="k">await</span> <span class="nf">foo</span><span class="p">()</span>
|
||
<span class="p">}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="nf">init</span><span class="p">()</span> <span class="k">async</span> <span class="p">{</span>
|
||
<span class="kd">func</span> <span class="nf">test</span><span class="p">()</span> <span class="k">async</span> <span class="p">{</span>
|
||
<span class="k">await</span> <span class="nf">foo</span><span class="p">()</span>
|
||
<span class="p">}</span>
|
||
<span class="k">await</span> <span class="p">{</span> <span class="k">await</span> <span class="nf">foo</span><span class="p">()</span> <span class="p">}()</span>
|
||
<span class="p">}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="nf">subscript</span><span class="p">(</span><span class="nv">row</span><span class="p">:</span> <span class="kt">Int</span><span class="p">)</span> <span class="o">-></span> <span class="kt">Double</span> <span class="p">{</span>
|
||
<span class="k">get</span> <span class="k">async</span> <span class="p">{</span>
|
||
<span class="k">await</span> <span class="nf">foo</span><span class="p">()</span>
|
||
<span class="p">}</span>
|
||
<span class="p">}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="kd">func</span> <span class="nf">foo</span><span class="p">()</span> <span class="k">async</span> <span class="o">-></span> <span class="kt">Int</span>
|
||
<span class="kd">func</span> <span class="nf">bar</span><span class="p">()</span> <span class="k">async</span> <span class="o">-></span> <span class="kt">Int</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="k">var</span> <span class="nv">foo</span><span class="p">:</span> <span class="kt">Int</span> <span class="p">{</span> <span class="k">get</span> <span class="k">async</span> <span class="p">}</span>
|
||
<span class="k">var</span> <span class="nv">bar</span><span class="p">:</span> <span class="kt">Int</span> <span class="p">{</span> <span class="k">get</span> <span class="k">async</span> <span class="p">}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="nf">init</span><span class="p">(</span><span class="nv">foo</span><span class="p">:</span> <span class="n">bar</span><span class="p">)</span> <span class="k">async</span>
|
||
<span class="nf">init</span><span class="p">(</span><span class="nv">baz</span><span class="p">:</span> <span class="n">qux</span><span class="p">)</span> <span class="k">async</span>
|
||
<span class="k">let</span> <span class="nv">baz</span> <span class="o">=</span> <span class="p">{</span> <span class="nf">qux</span><span class="p">()</span> <span class="p">}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="kd">typealias</span> <span class="kt">Foo</span> <span class="o">=</span> <span class="p">()</span> <span class="k">async</span> <span class="o">-></span> <span class="kt">Void</span>
|
||
<span class="kd">typealias</span> <span class="kt">Bar</span> <span class="o">=</span> <span class="p">()</span> <span class="k">async</span> <span class="o">-></span> <span class="kt">Void</span>
|
||
<span class="k">let</span> <span class="nv">baz</span> <span class="o">=</span> <span class="p">{</span> <span class="nf">qux</span><span class="p">()</span> <span class="p">}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="kd">func</span> <span class="nf">test</span><span class="p">()</span> <span class="k">async</span> <span class="p">{</span>
|
||
<span class="k">for</span> <span class="k">await</span> <span class="n">foo</span> <span class="k">in</span> <span class="n">bar</span> <span class="p">{}</span>
|
||
<span class="p">}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="kd">func</span> <span class="nf">test</span><span class="p">()</span> <span class="k">async</span> <span class="p">{</span>
|
||
<span class="k">while</span> <span class="k">let</span> <span class="nv">foo</span> <span class="o">=</span> <span class="k">await</span> <span class="nf">bar</span><span class="p">()</span> <span class="p">{}</span>
|
||
<span class="p">}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="kd">func</span> <span class="nf">test</span><span class="p">()</span> <span class="k">async</span> <span class="p">{</span>
|
||
<span class="k">async</span> <span class="k">let</span> <span class="nv">foo</span> <span class="o">=</span> <span class="nf">bar</span><span class="p">()</span>
|
||
<span class="k">let</span> <span class="nv">baz</span> <span class="o">=</span> <span class="k">await</span> <span class="n">foo</span>
|
||
<span class="p">}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="kd">func</span> <span class="nf">test</span><span class="p">()</span> <span class="k">async</span> <span class="p">{</span>
|
||
<span class="k">async</span> <span class="k">let</span> <span class="nv">foo</span> <span class="o">=</span> <span class="nf">bar</span><span class="p">()</span>
|
||
<span class="k">await</span> <span class="n">foo</span>
|
||
<span class="p">}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="kd">func</span> <span class="nf">test</span><span class="p">()</span> <span class="k">async</span> <span class="p">{</span>
|
||
<span class="k">async</span> <span class="k">let</span> <span class="nv">foo</span> <span class="o">=</span> <span class="nf">bar</span><span class="p">()</span>
|
||
<span class="p">}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="kd">func</span> <span class="nf">foo</span><span class="p">(</span><span class="nv">bar</span><span class="p">:</span> <span class="p">()</span> <span class="k">async</span> <span class="o">-></span> <span class="kt">Void</span><span class="p">)</span> <span class="p">{</span> <span class="p">{</span> <span class="p">}</span> <span class="p">}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="kd">func</span> <span class="nf">foo</span><span class="p">(</span><span class="nv">bar</span><span class="p">:</span> <span class="p">()</span> <span class="k">async</span> <span class="o">-></span> <span class="kt">Void</span> <span class="o">=</span> <span class="p">{</span> <span class="k">await</span> <span class="nf">baz</span><span class="p">()</span> <span class="p">})</span> <span class="p">{</span> <span class="p">{}</span> <span class="p">}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="kd">func</span> <span class="nf">foo</span><span class="p">()</span> <span class="o">-></span> <span class="p">(()</span> <span class="k">async</span> <span class="o">-></span> <span class="kt">Void</span><span class="p">)?</span> <span class="p">{</span> <span class="p">{}</span> <span class="p">}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="kd">func</span> <span class="nf">foo</span><span class="p">(</span>
|
||
<span class="nv">bar</span><span class="p">:</span> <span class="p">()</span> <span class="k">async</span> <span class="o">-></span> <span class="kt">Void</span><span class="p">,</span>
|
||
<span class="nv">baz</span><span class="p">:</span> <span class="p">()</span> <span class="o">-></span> <span class="kt">Void</span> <span class="o">=</span> <span class="p">{}</span>
|
||
<span class="p">)</span> <span class="p">{</span> <span class="p">{</span> <span class="p">}</span> <span class="p">}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="kd">func</span> <span class="nf">foo</span><span class="p">(</span><span class="nv">bar</span><span class="p">:</span> <span class="p">()</span> <span class="k">async</span> <span class="o">-></span> <span class="kt">Void</span> <span class="o">=</span> <span class="p">{})</span> <span class="p">{</span> <span class="p">}</span>
|
||
</code></pre>
|
||
<h2 id='triggering-examples' class='heading'>Triggering Examples</h2>
|
||
<pre class="highlight swift"><code><span class="kd">func</span> <span class="nf">test</span><span class="p">()</span> <span class="err">↓</span><span class="k">async</span> <span class="p">{</span>
|
||
<span class="nf">perform</span><span class="p">()</span>
|
||
<span class="p">}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="kd">func</span> <span class="nf">test</span><span class="p">()</span> <span class="p">{</span>
|
||
<span class="kd">func</span> <span class="nf">baz</span><span class="p">()</span> <span class="err">↓</span><span class="k">async</span> <span class="p">{</span>
|
||
<span class="nf">qux</span><span class="p">()</span>
|
||
<span class="p">}</span>
|
||
<span class="nf">perform</span><span class="p">()</span>
|
||
<span class="kd">func</span> <span class="nf">baz</span><span class="p">()</span> <span class="p">{</span>
|
||
<span class="nf">qux</span><span class="p">()</span>
|
||
<span class="p">}</span>
|
||
<span class="p">}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="kd">func</span> <span class="nf">test</span><span class="p">()</span> <span class="err">↓</span><span class="k">async</span> <span class="p">{</span>
|
||
<span class="kd">func</span> <span class="nf">baz</span><span class="p">()</span> <span class="k">async</span> <span class="p">{</span>
|
||
<span class="k">await</span> <span class="nf">qux</span><span class="p">()</span>
|
||
<span class="p">}</span>
|
||
<span class="p">}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="kd">func</span> <span class="nf">test</span><span class="p">()</span> <span class="err">↓</span><span class="k">async</span> <span class="p">{</span>
|
||
<span class="kd">func</span> <span class="nf">foo</span><span class="p">()</span> <span class="err">↓</span><span class="k">async</span> <span class="p">{}</span>
|
||
<span class="k">let</span> <span class="nv">bar</span> <span class="o">=</span> <span class="p">{</span> <span class="k">await</span> <span class="nf">foo</span><span class="p">()</span> <span class="p">}</span>
|
||
<span class="p">}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="kd">func</span> <span class="nf">test</span><span class="p">()</span> <span class="err">↓</span><span class="k">async</span> <span class="p">{</span>
|
||
<span class="k">let</span> <span class="nv">bar</span> <span class="o">=</span> <span class="p">{</span>
|
||
<span class="kd">func</span> <span class="nf">foo</span><span class="p">()</span> <span class="err">↓</span><span class="k">async</span> <span class="p">{}</span>
|
||
<span class="p">}</span>
|
||
<span class="p">}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="k">let</span> <span class="nv">x</span><span class="p">:</span> <span class="p">(()</span> <span class="err">↓</span><span class="k">async</span> <span class="o">-></span> <span class="kt">Void</span><span class="p">)?</span> <span class="o">=</span> <span class="p">{</span> <span class="nf">test</span><span class="p">()</span> <span class="p">}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="k">var</span> <span class="nv">test</span><span class="p">:</span> <span class="kt">Int</span> <span class="p">{</span>
|
||
<span class="k">get</span> <span class="err">↓</span><span class="k">async</span> <span class="k">throws</span> <span class="p">{</span>
|
||
<span class="nf">foo</span><span class="p">()</span>
|
||
<span class="p">}</span>
|
||
<span class="p">}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="k">var</span> <span class="nv">test</span><span class="p">:</span> <span class="kt">Int</span> <span class="p">{</span>
|
||
<span class="k">get</span> <span class="err">↓</span><span class="k">async</span> <span class="k">throws</span> <span class="p">{</span>
|
||
<span class="kd">func</span> <span class="nf">foo</span><span class="p">()</span> <span class="err">↓</span><span class="k">async</span> <span class="p">{}</span>
|
||
<span class="k">let</span> <span class="nv">bar</span> <span class="o">=</span> <span class="p">{</span> <span class="k">await</span> <span class="nf">foo</span><span class="p">()</span> <span class="p">}</span>
|
||
<span class="p">}</span>
|
||
<span class="p">}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="k">var</span> <span class="nv">test</span><span class="p">:</span> <span class="kt">Int</span> <span class="p">{</span>
|
||
<span class="k">get</span> <span class="k">throws</span> <span class="p">{</span>
|
||
<span class="kd">func</span> <span class="nf">foo</span><span class="p">()</span> <span class="p">{}</span>
|
||
<span class="k">let</span> <span class="nv">bar</span><span class="p">:</span> <span class="p">()</span> <span class="err">↓</span><span class="k">async</span> <span class="o">-></span> <span class="kt">Void</span> <span class="o">=</span> <span class="p">{</span> <span class="nf">foo</span><span class="p">()</span> <span class="p">}</span>
|
||
<span class="p">}</span>
|
||
<span class="p">}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="nf">init</span><span class="p">()</span> <span class="err">↓</span><span class="k">async</span> <span class="p">{}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="nf">init</span><span class="p">()</span> <span class="err">↓</span><span class="k">async</span> <span class="p">{</span>
|
||
<span class="kd">func</span> <span class="nf">foo</span><span class="p">()</span> <span class="err">↓</span><span class="k">async</span> <span class="p">{}</span>
|
||
<span class="k">let</span> <span class="nv">bar</span><span class="p">:</span> <span class="p">()</span> <span class="err">↓</span><span class="k">async</span> <span class="o">-></span> <span class="kt">Void</span> <span class="o">=</span> <span class="p">{</span> <span class="nf">foo</span><span class="p">()</span> <span class="p">}</span>
|
||
<span class="p">}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="nf">subscript</span><span class="p">(</span><span class="nv">row</span><span class="p">:</span> <span class="kt">Int</span><span class="p">)</span> <span class="o">-></span> <span class="kt">Double</span> <span class="p">{</span>
|
||
<span class="k">get</span> <span class="err">↓</span><span class="k">async</span> <span class="p">{</span>
|
||
<span class="mf">1.0</span>
|
||
<span class="p">}</span>
|
||
<span class="p">}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="kd">func</span> <span class="nf">test</span><span class="p">()</span> <span class="err">↓</span><span class="k">async</span> <span class="p">{</span>
|
||
<span class="k">for</span> <span class="n">foo</span> <span class="k">in</span> <span class="n">bar</span> <span class="p">{}</span>
|
||
<span class="p">}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="kd">func</span> <span class="nf">test</span><span class="p">()</span> <span class="err">↓</span><span class="k">async</span> <span class="p">{</span>
|
||
<span class="k">while</span> <span class="k">let</span> <span class="nv">foo</span> <span class="o">=</span> <span class="nf">bar</span><span class="p">()</span> <span class="p">{}</span>
|
||
<span class="p">}</span>
|
||
</code></pre>
|
||
|
||
</div>
|
||
</section>
|
||
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||
|
||
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|
||
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|
||
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|
||
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||
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