https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83529
--- Comment #7 from Nathan Sidwell <nathan at gcc dot gnu.org> ---
int Foo (void *);
template <int> class TPL;
template <int I> TPL<Foo (I)> Baz ();
int Foo (float);
template <int I> TPL<Foo (I)> Baz ();
constexpr int Foo (int) {return 0;}int Foo (int);
A less templatey case.
83529.ii:6:26: error: call to non-'constexpr' function 'int Foo(void*)'
template <int I> TPL<Foo (I)> Baz ();
~~~~^~~
83529.ii:10:36: internal compiler error: canonical types differ for identical
types 'TPL<Foo(I)>' and 'TPL<Foo(I)>'
