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From: "ppalka at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/97679] New: ICE with CTAD on a nested class template with
 constrained constructor
Date: Mon, 02 Nov 2020 18:47:47 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D97679

            Bug ID: 97679
           Summary: ICE with CTAD on a nested class template with
                    constrained constructor
           Product: gcc
           Version: 10.2.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: ppalka at gcc dot gnu.org
  Target Milestone: ---

$ cat testcase.C
template <bool V> struct A {
  template <class T> struct B { B(T) requires V; };
};

A<true>::B x(0);

$ g++ -std=3Dc++20 testcase.C
testcase.C: In substitution of =E2=80=98template<class T> B(T)-> A<true>::B=
<T> requires
 T [with T =3D int]=E2=80=99:
testcase.C:5:15:   required from here
testcase.C:5:15: internal compiler error: Segmentation fault
    5 | A<true>::B x(0);
      |               ^=