Explicit instantiation of empty template parameter packs

[Sam Varshavchik]

Given the following template, with gcc 4.6 and -std=c++0x:

=============================================================================

template<typename... Args>
void foo(Args... args)
{
}

=============================================================================

Both "foo();" and "foo(4);" compiles, as expected. If I want to explicitly  
instantiate both template signatures:

template void foo(int);

This goes through. But this does not:

template void foo();

gcc 4.6 rejects this:

/tmp/t.C:16:15: error: template-id ‘foo<>’ for ‘void foo()’ does not match  
any template declaration

How do I tell gcc to explicitly instantiate template with an empty parameter  
pack. It'll obviously instantiate it implicitly, since "foo();" gets  
compiled, as expected.

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