[Bug c++/79706] invalid delete[] expression doesn't cause substitution failure

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79706

--- Comment #5 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Ah good point.

struct A {
  void operator delete(void*) = delete;
  void operator delete[](void*) = delete;
};

A* f();
A* f2();

using type1 = decltype(delete f());
using type2 = decltype(delete[] f2());

This fails as expected.

Comment 2 is not a bug then, but comment 1 and comment 3 still seem like bugs.