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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Expanding template parameter pack followed by additional arguments into alias template trips assertion"
href="http://llvm.org/bugs/show_bug.cgi?id=15276">15276</a>
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<th>Summary</th>
<td>Expanding template parameter pack followed by additional arguments into alias template trips assertion
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>3.2
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>C++11
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>illissius@gmail.com
</td>
</tr>
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<th>CC</th>
<td>dgregor@apple.com, llvmbugs@cs.uiuc.edu
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<th>Classification</th>
<td>Unclassified
</td>
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<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=10022" name="attach_10022" title="preprocessed source">attachment 10022</a> <a href="attachment.cgi?id=10022&action=edit" title="preprocessed source">[details]</a></span>
preprocessed source
The smallest program I found which trips the assertion is:
template<typename... Ts>
struct Foo
{
template<typename U>
void foo();
};
template<typename... Ts>
using Bar = Foo<Ts...>;
template<typename... Ts>
template<typename U>
void Foo<Ts...>::foo()
{
Bar<Ts..., U> bar;
}
Any of the following make it go away:
- Bar<Ts...> instead of Bar<Ts..., U>
- Bar<U, Ts...> instead of Bar<Ts..., U>
- Foo<Ts..., U> instead of Bar<Ts..., U>
- using Bar = int; instead of using Bar = Foo<Ts...>;
Clang 3.1 and 3.2 both assert.</pre>
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