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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 10 disallows modifying const member by an unused member function in a templated class; while Clang 9 allows it"
href="https://bugs.llvm.org/show_bug.cgi?id=47789">bug 47789</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
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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 - Clang 10 disallows modifying const member by an unused member function in a templated class; while Clang 9 allows it"
href="https://bugs.llvm.org/show_bug.cgi?id=47789#c1">Comment # 1</a>
on <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED INVALID - Clang 10 disallows modifying const member by an unused member function in a templated class; while Clang 9 allows it"
href="https://bugs.llvm.org/show_bug.cgi?id=47789">bug 47789</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>This is not a bug. The C++ language rules disallow templates that have no valid
instantiations, but don't require implementations to diagnose such problems.
(Clang always intends to diagnose such cases; what happened between Clang 9 and
10 was that we fixed a bug that incorrectly caused this pattern to result in a
dependent class member access. That bugfix then allowed us to diagnose
eagerly.)
For what it's worth, the EDG frontend also rejects this code in its strict
mode.</pre>
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