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<body><span class="vcard"><a class="email" href="mailto:aaron@aaronballman.com" title="Aaron Ballman <aaron@aaronballman.com>"> <span class="fn">Aaron Ballman</span></a>
</span> changed
<a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED INVALID - Compile fails when using enum declaration"
href="https://bugs.llvm.org/show_bug.cgi?id=52403">bug 52403</a>
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<table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>What</th>
<th>Removed</th>
<th>Added</th>
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<tr>
<td style="text-align:right;">Status</td>
<td>CONFIRMED
</td>
<td>RESOLVED
</td>
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<td style="text-align:right;">Resolution</td>
<td>---
</td>
<td>INVALID
</td>
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<b><a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED INVALID - Compile fails when using enum declaration"
href="https://bugs.llvm.org/show_bug.cgi?id=52403#c1">Comment # 1</a>
on <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED INVALID - Compile fails when using enum declaration"
href="https://bugs.llvm.org/show_bug.cgi?id=52403">bug 52403</a>
from <span class="vcard"><a class="email" href="mailto:aaron@aaronballman.com" title="Aaron Ballman <aaron@aaronballman.com>"> <span class="fn">Aaron Ballman</span></a>
</span></b>
<pre>Oops, I jumped the gun on confirming this. Sorry for the confusion!
I think Clang is correct to reject this code. <a href="http://eel.is/c++draft/enum.udecl">http://eel.is/c++draft/enum.udecl</a>
says that the production needs to parse an elaborated-enum-specifier. One of
the requirements for a valid elaborated-enum-specifier is that the elaboration
has to agree in kind with the given declaration
(<a href="https://eel.is/c++draft/dcl.type.elab#6">https://eel.is/c++draft/dcl.type.elab#6</a>). In this case, the given declaration
is not an enum, it's a type alias.
You can see that all compilers agree that `enum Hog` is an invalid elaborated
type specifier outside of a using enum declaration:
<a href="https://godbolt.org/z/MY7PbqbhK">https://godbolt.org/z/MY7PbqbhK</a>
Because it's not a valid elaborated-type-specifier, I think GCC and MSVC are
incorrect to accept this code.</pre>
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