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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/108503] [13 Regression] ICE in get_array_or_vector_nelts,
 at cp/constexpr.cc:4119
Date: Tue, 24 Jan 2023 00:48:51 +0000
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X-Bugzilla-Type: changed
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: c++
X-Bugzilla-Version: 13.0
X-Bugzilla-Keywords: ice-on-invalid-code, openmp
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D108503

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
     Ever confirmed|0                           |1
   Target Milestone|---                         |13.0
   Last reconfirmed|                            |2023-01-24
             Status|UNCONFIRMED                 |NEW

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Confirmed, here is a testcase that does not error out before the ICE:
```
namespace std {
  template<typename T> struct tuple_size;
  template<int, typename> struct tuple_element;
}
struct A {
  template <int I> int get() { return 1; }
};
template<> struct std::tuple_size<A> { static const int value =3D 3; };
template<int I> struct std::tuple_element<I,A> { using type =3D int; };
struct B {
  A *begin();
  A *end();
};
void f (B a)
{
  #pragma omp for collapse(2)
  for (auto [i, j, k] : a)
    for (int l =3D i; l < j; l +=3D k)
      ;
}
```
Note -fopenmp -Wall is needed to get the ICE.=