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From: "jlame646 at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/106313] New: GCC incorrectly compiles code involving concept
Date: Fri, 15 Jul 2022 11:19:54 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D106313

            Bug ID: 106313
           Summary: GCC incorrectly compiles code involving concept
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: jlame646 at gmail dot com
  Target Milestone: ---

The following program is compiled in gcc 12.1 even though it should not as
`obj` is not a constant expression. A working demo can be seen
here:https://godbolt.org/z/aqoMGazfd

```
template<bool op>
class Person
{
    const bool own_pet;

public:
    Person() : own_pet(op) {}
    consteval bool OwnPet() const { return own_pet; }
    consteval bool OwnPetC() const { return true; }
    void PatPet() const {}
};

template<typename T>
concept MustOwnPet =3D requires(T obj) {
    requires obj.OwnPet();
};

void pat(const MustOwnPet auto& p)
{
    p.PatPet();
}

template<typename T>
concept MustOwnPetC =3D requires(T obj) {
    requires obj.OwnPetC();
};

void pat_c(const MustOwnPetC auto& p)
{
    p.PatPet();
}

int main()
{

    pat_c(Person<true>());=20

    return 0;
}
```=