Similar to#49188, but whereas in that issue the problem was anauto return type being deduced tovoid, here the problem is theauto in the return type being modified by a pointer qualification. For example:https://godbolt.org/z/T8j3j7j58

namespace Bug {  template<class T> concept C = false;  C auto *f() {    return (int*)nullptr;  }}

This should be a hard error, becauseauto deduces toint andC<int> is false. But instead, Clang silently accepts!