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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>
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<a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - assertion "Replacement.isCanonical() && "replacement types must always be canonical"""
href="http://llvm.org/bugs/show_bug.cgi?id=19372">bug 19372</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>FIXED
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<b><a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - assertion "Replacement.isCanonical() && "replacement types must always be canonical"""
href="http://llvm.org/bugs/show_bug.cgi?id=19372#c8">Comment # 8</a>
on <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - assertion "Replacement.isCanonical() && "replacement types must always be canonical"""
href="http://llvm.org/bugs/show_bug.cgi?id=19372">bug 19372</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>Fixed in r221832.
And now I understand the problem, here's a simpler reducer:
template<typename...> struct S;
template<typename ...A> using X = S<A...>;
template<typename ...A> using Y = X<A..., A...>;</pre>
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