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From: "jeanmichael.celerier at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/111748] New: GCC does not understand partial ordering
 between non-constrained and constrained templates for specialization
Date: Mon, 09 Oct 2023 22:24:54 +0000
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: c++
X-Bugzilla-Version: 13.1.1
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X-Bugzilla-Who: jeanmichael.celerier at gmail dot com
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D111748

            Bug ID: 111748
           Summary: GCC does not understand partial ordering between
                    non-constrained and constrained templates for
                    specialization
           Product: gcc
           Version: 13.1.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: jeanmichael.celerier at gmail dot com
  Target Milestone: ---

Consider:=20

    #include<concepts>

    template<typename>
    void foo() { }

    template<std::integral>=20
    void foo() { }

    template<>=20
    void foo<bool>() { }

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


According to the answers I got in https://stackoverflow.com/questions/77261=
120/
GCC should be able to compile this code, yet it fails due to a supposed
ambiguity between=20

    template<typename>
    void foo() { }

and

    template<std::integral>=20
    void foo() { }

as the base of foo<bool>=