[Bug c++/94508] ICE in tsubst_copy, at cp/pt.c:16186

[asolokha at gmx dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94508

--- Comment #2 from Arseny Solokha <asolokha at gmx dot com> ---
(In reply to Martin Liška from comment #1)
> Confirmed, -fconcepts started with GCC 6. Is it a valid or invalid code?

clang rejects it, but accepts the following one, on which g++ also ICEs:

template<typename T>
struct S4 {
  void foo() requires (this, true) { }
};

void
bar ()
{
  S4<int>{}.foo ();
}