Variadic Reification

Due to the semantic properties of each reifier, each one cannot necessarily be used anywhere a parameter pack can be used. The namespace reifier cannot be used as a variadic reifier. The following is a table of the specific contexts in which a variadic reifier can be used:

	valueof	idexpr	unqualid	typename	namespace
function parameter list	x	x	x
template argument list	x	x	x	x
base specifier				x
member initializer list				x
brace initializer list	x	x	x
alignment specifier	x	x	x