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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 - Incorrectly accepts double declarations"
href="https://bugs.llvm.org/show_bug.cgi?id=38144">bug 38144</a>
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<th>What</th>
<th>Removed</th>
<th>Added</th>
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<td style="text-align:right;">CC</td>
<td>
</td>
<td>richard-llvm@metafoo.co.uk
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<td style="text-align:right;">Status</td>
<td>NEW
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<td>RESOLVED
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<td style="text-align:right;">Resolution</td>
<td>---
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<td>INVALID
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<b><a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED INVALID - Incorrectly accepts double declarations"
href="https://bugs.llvm.org/show_bug.cgi?id=38144#c1">Comment # 1</a>
on <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED INVALID - Incorrectly accepts double declarations"
href="https://bugs.llvm.org/show_bug.cgi?id=38144">bug 38144</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>[namespace.udecl]p10: "A using-declaration is a declaration and can therefore
be used repeatedly where (and only where) multiple declarations are allowed"
Block scope is a place where multiple declarations are allowed. GCC allows
this, for example:
void f() {
extern int i;
extern int i;
}
So I would argue that this is a GCC bug. However, see core issue 36
(<a href="http://wg21.link/cwg36">http://wg21.link/cwg36</a>) -- CWG does not have a consensus position on the
desired validity of this example.</pre>
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