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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Variadic pack at the beginning of function parameters not seen as a non-deduced context"
href="http://llvm.org/bugs/show_bug.cgi?id=15799">15799</a>
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<th>Summary</th>
<td>Variadic pack at the beginning of function parameters not seen as a non-deduced context
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>C++11
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>hivemaster@hotmail.de
</td>
</tr>
<tr>
<th>CC</th>
<td>dgregor@apple.com, llvmbugs@cs.uiuc.edu
</td>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>The following simple snippet fails to compile:
template<typename T> struct any{ template<typename U> any(U){} };
template<typename... Ts, typename T>
T back(any<Ts>..., T);
int main(){
using _ = decltype(back<int>(true, 42));
}
With:
main.cpp:7:24: error: no matching function for call to 'back'
using _ = decltype(back<int>(true, 42));
^~~~~~~~~
main.cpp:4:3: note: candidate template ignored: couldn't infer template
argument 'T'
T back(any<Ts>..., T);
May be related to <a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Pack expansion that was already expanded treated as a non-deduced context."
href="show_bug.cgi?id=9020">http://llvm.org/bugs/show_bug.cgi?id=9020</a></pre>
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