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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 - clang reports an error: no member a class defination"
href="https://bugs.llvm.org/show_bug.cgi?id=47520">bug 47520</a>
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<table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>What</th>
<th>Removed</th>
<th>Added</th>
</tr>
<tr>
<td style="text-align:right;">Status</td>
<td>NEW
</td>
<td>RESOLVED
</td>
</tr>
<tr>
<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 - clang reports an error: no member a class defination"
href="https://bugs.llvm.org/show_bug.cgi?id=47520#c1">Comment # 1</a>
on <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED INVALID - clang reports an error: no member a class defination"
href="https://bugs.llvm.org/show_bug.cgi?id=47520">bug 47520</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>Clang is correct; this code is ill-formed. In the context of
C1<T1>::C2::C3::f(), C1<T1> is considered to be part of "the current
instantiation", because it can't be specialized without eliminating that
declaration of C1<T1>::C2::C3::f() as a member. Therefore the standard
specifies that lookup of E is done from the template definition context, and
because C1 has no dependent base classes, it needs to succeed in that context.
Now, GCC's behavior here is also conforming -- an implementation is more or
less never required to diagnose invalid template definitions if the template is
nevrer instantiated -- but the behavior of Clang and other compilers that
diagnose this eagerly (such as EDG) is generally considered preferable.</pre>
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