[Bug c++/91165] [10 Regression] error: location references block not in block tree

[marxin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91165

--- Comment #5 from Martin Liška <marxin at gcc dot gnu.org> ---
My reduced test-case is probably very similar:

template <typename _Tp> constexpr _Tp forward(_Tp p1) { return p1; }
template <typename _T1, typename _T2> struct A {
  _T1 first;
  _T2 second;
  constexpr A(_T1 p1, _T2 p2) : first(p1), second(p2) {}
};
template <typename _T1, typename _T2>
constexpr A<_T1, _T2> make_pair(_T1 &&p1, _T2 p2) {
  return A<_T1, _T2>(forward(p1), forward(p2));
}
typedef enum { EShLangCount } EShLanguage;
class B {
  A<EShLanguage, int> m_fn1() const;
};
const int a = 0;
void DecodeLineDirective() { make_pair(a, ""); }
A<EShLanguage, int> B::m_fn1() const { make_pair(EShLangCount, ""); }