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From: "roi.jacobson1 at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/108769] New: [C++20] __is_trivial returns true even if a
 default constructor's constrains are unsatisfied
Date: Mon, 13 Feb 2023 09:06:49 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D108769

            Bug ID: 108769
           Summary: [C++20] __is_trivial returns true even if a default
                    constructor's constrains are unsatisfied
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: roi.jacobson1 at gmail dot com
  Target Milestone: ---

GCC accepts this code:

template <class T>
struct S {
    S() requires false =3D default;
};
static_assert(__is_trivial(S<int>));

There are some related DRs that GCC doesn't implement (like DR1363), but I
don't think this falls under any of them.=