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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/110513] Invalid use of incomplete type std::bool_constant
 inside requires expression
Date: Sat, 01 Jul 2023 18:35:04 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: c++
X-Bugzilla-Version: 13.1.0
X-Bugzilla-Keywords: rejects-valid
X-Bugzilla-Severity: normal
X-Bugzilla-Who: pinskia at gcc dot gnu.org
X-Bugzilla-Status: NEW
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X-Bugzilla-Priority: P3
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Message-ID: <bug-110513-4-IBv1udmMFT@http.gcc.gnu.org/bugzilla/>
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D110513

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2023-07-01
     Ever confirmed|0                           |1
           Keywords|                            |rejects-valid

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Reduced testcase:
```
template<bool a>
struct bool_const1=20
{
  typedef bool T;
  static constexpr T value =3D a;
  constexpr T operator()(){return value;}
};

struct B {
    bool b =3D true;
};

// ok everywhere
static_assert( bool_const1<B{}.b>{}() );

// error in GCC
static_assert( requires() { bool_const1<B{}.b>{}(); } );
```=