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// PR c++/48115 template<typename> struct templ { }; template<typename T> T declval(); typedef int (*F2)(...); template<int> struct Int { }; template<typename F, typename T> struct S { template<typename A> Int<sizeof( declval<F>()(T()) )> f(A); }; int main() { S<F2, templ<int> >().f(0); }