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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Can't constrain the auto introducing a trailing-return-type"
href="https://bugs.llvm.org/show_bug.cgi?id=51856">51856</a>
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<th>Summary</th>
<td>Can't constrain the auto introducing a trailing-return-type
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Keywords</th>
<td>compile-fail
</td>
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<th>Severity</th>
<td>enhancement
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>C++2a
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<tr>
<th>Reporter</th>
<td>johelegp@gmail.com
</td>
</tr>
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<th>CC</th>
<td>blitzrakete@gmail.com, erik.pilkington@gmail.com, johelegp@gmail.com, llvm-bugs@lists.llvm.org, richard-llvm@metafoo.co.uk
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<pre>This does not appear to be forbidden by [dcl.spec.auto.general].
See <a href="https://godbolt.org/z/96GcvfMdK">https://godbolt.org/z/96GcvfMdK</a>.
```C++
template<class>concept C=true;
C auto f()->int;
```
```
<source>:2:1: error: function with trailing return type must specify return
type 'auto', not 'C auto'
C auto f()->int;
^~~~~~
1 error generated.
Compiler returned: 1
```</pre>
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