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From: "hewillk at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/101990] New: ICE: tree check: expected class 'type', have
 'exceptional' (error_mark) in useless_type_conversion_p, at gimple-expr.c:87
Date: Fri, 20 Aug 2021 01:58:08 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D101990

            Bug ID: 101990
           Summary: ICE: tree check: expected class 'type', have
                    'exceptional' (error_mark) in
                    useless_type_conversion_p, at gimple-expr.c:87
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: hewillk at gmail dot com
  Target Milestone: ---

template<auto> class S {};

template<class T> concept C =3D requires { []<T x>() -> typename S<x> { }; =
};

void foo(bool);

int main() {
  foo(C<int>);
}

https://godbolt.org/z/zsYY5bPoW=