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<body><span class="vcard"><a class="email" href="mailto:richard-llvm@metafoo.co.uk" title="Richard Smith <richard-llvm@metafoo.co.uk>"> <span class="fn">Richard Smith</span></a>
</span> changed
<a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED INVALID - Error about incomplete field is issued for inner typedef in incomplete class, but not for incomplete class itself"
href="https:llvm.org/bugs/show_bug.cgi?id=22838">bug 22838</a>
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<th>What</th>
<th>Removed</th>
<th>Added</th>
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<td style="text-align:right;">Status</td>
<td>NEW
</td>
<td>RESOLVED
</td>
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<td style="text-align:right;">CC</td>
<td>
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<td>richard-llvm@metafoo.co.uk
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<td style="text-align:right;">Resolution</td>
<td>---
</td>
<td>INVALID
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<b><a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED INVALID - Error about incomplete field is issued for inner typedef in incomplete class, but not for incomplete class itself"
href="https:llvm.org/bugs/show_bug.cgi?id=22838#c4">Comment # 4</a>
on <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED INVALID - Error about incomplete field is issued for inner typedef in incomplete class, but not for incomplete class itself"
href="https:llvm.org/bugs/show_bug.cgi?id=22838">bug 22838</a>
from <span class="vcard"><a class="email" href="mailto:richard-llvm@metafoo.co.uk" title="Richard Smith <richard-llvm@metafoo.co.uk>"> <span class="fn">Richard Smith</span></a>
</span></b>
<pre>C++ [res.on.functions](17.6.4.8)p2 says this about templates defined in the
standard library:
"In particular, the effects are undefined in the following cases:
[...]
-- if an incomplete type (3.9) is used as a template argument when
instantiating a template component, unless specifically allowed for that
component."
In any case, you've not presented evidence indicating a Clang bug. You could
try asking whoever wrote your standard library if they're prepared to allow
your code as an extension.</pre>
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