[C++11] trivial use of variadic templates crashes clang

[llvmbot]

Bugzilla Link	13386
Resolution	FIXED
Resolved on	Jul 17, 2012 20:29
Version	trunk
OS	Windows NT
Reporter	LLVM Bugzilla Contributor
CC	@DougGregor,@zygoloid

Extended Description

The following code is currently crashing clang for me:

template<typename ...T>
struct foo
{
template<typename ...U>
void bar(T &&...t, U &&... u) {}
};

int main()
{
foo<>().bar(42);
}

It is accepted by gcc 4.7.

[zygoloid]

SemaTemplateInstantiateDecl.cpp:2184 has an almost prescient comment, just before the point where we crash:

// FIXME: Is this right? OldParam could expand to an empty parameter
// pack and the next parameter could be an unexpanded parameter pack

[zygoloid]

Fixed in r160416.