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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 erroneously enforcing alias template parameter kind"
href="http://llvm.org/bugs/show_bug.cgi?id=19373">bug 19373</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
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<td>RESOLVED
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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 - clang erroneously enforcing alias template parameter kind"
href="http://llvm.org/bugs/show_bug.cgi?id=19373#c1">Comment # 1</a>
on <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED INVALID - clang erroneously enforcing alias template parameter kind"
href="http://llvm.org/bugs/show_bug.cgi?id=19373">bug 19373</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>Your instantiation is this:
template<typename T, typename ...Us> using X = T;
struct S/*<X>*/ {
template<typename ...Us> using X = ::X<Us...>;
};
Clang implements the proposed direction of core issue 1430 here, under which
this is ill-formed. (You can't use alias templates to pull a pack apart;
they're substituted / canonicalized before the pack size is known, so this
would present significant implementation issues.)
GCC trunk rejects your testcase with essentially the same diagnostic that clang
provides.</pre>
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