https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78308
TC <rs2740 at gmail dot com> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |rs2740 at gmail dot com --- Comment #1 from TC <rs2740 at gmail dot com> --- A rejects-valid case: struct C { template<int> void f(); }; struct D : C { template<char> void f(); using C::f; }; int main(){ D().f<0>(); } GCC rejects as ambiguous, Clang accepts as it only considers the template<char> one.