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From: "doko at debian dot org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/95678] New: [9 Regression] ICE in dependent_type_p, at
 cp/pt.c:25610
Date: Mon, 15 Jun 2020 09:12:28 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D95678

            Bug ID: 95678
           Summary: [9 Regression] ICE in dependent_type_p, at
                    cp/pt.c:25610
           Product: gcc
           Version: 9.3.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: doko at debian dot org
  Target Milestone: ---

seen with the gcc-9 branch 20200518, not with the gcc-10 branch.

$ cat unique.ii
# 7 "" 3
template <class b> struct c {
  using d =3D b;
  template <class bb, class e> auto operator()(bb l, e) -> decltype(d{l});
};
template <class f, template <class> class g> h() {
  using i =3D g<f>;
  int a[]{};
  unsigned j;
  i{}(a, j);
}
k() { h<int *, c>(); }

$ g++ -c -std=3Dc++14 -Wall -fconcepts unique.ii
: In instantiation of =E2=80=98decltype (c<b>::d{l}) c<b>::operator()(bb, e=
) [with bb =3D
int*; e =3D unsigned int; b =3D int*]=E2=80=99:
:9:37: internal compiler error: in dependent_type_p, at cp/pt.c:25610
0x7f56f3effe0a __libc_start_main
        ../csu/libc-start.c:308
Please submit a full bug report,
with preprocessed source if appropriate.=