Does this do the right thing in the context of variadic template pack
expansions? For lambda expressions, we deliberately do not inherit the mangling
number because that would not be correct:
template<typename ...Ts> void f(std::function<T()> ...fn = []{ return T();
}) {}
... would give all the instantiated lambdas the same mangling number, for
instance.
What we do for lambdas is to compute the mangling number during instantiation
in the same way we compute it during parsing.
http://llvm-reviews.chandlerc.com/D2203
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