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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - LLVM_NODISCARD does not work in for loops."
href="https://bugs.llvm.org/show_bug.cgi?id=37767">37767</a>
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<th>Summary</th>
<td>LLVM_NODISCARD does not work in for loops.
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>Support Libraries
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>gchatelet@google.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>See the following snippe (<a href="https://godbolt.org/g/DxoBaC">https://godbolt.org/g/DxoBaC</a>)
<span class="quote">> #include "llvm/Support/Error.h"
>
> struct A {
> llvm::Error foo() const;
> };
>
> void bar(llvm::ArrayRef<A> As) {
> for(const auto& A : As)
> A.foo(); // No warning.
> }
>
> void baz(llvm::ArrayRef<A> As) {
> As.front().foo(); // Warning.
> }</span >
llvm::Error is marked LLVM_NODISCARD and should generate a warning if not
consumed.
`baz` generates a warning with clang but `bar` does not.
When using gcc, no warning is generated at all.</pre>
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