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From: "ppalka at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/110197] [13/14 Regression] Empty constexpr object
 constructor erronously claims out of range access
Date: Thu, 20 Jul 2023 16:51:32 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D110197

--- Comment #4 from Patrick Palka <ppalka at gcc dot gnu.org> ---
Looks like this issue isn't specific to constexpr array construction:

struct Currency {
  constexpr Currency(int) { }
};
constexpr int f() { return __builtin_is_constant_evaluated(); };
struct A {
  Currency _M_elems;
};
constexpr A _M_elems =3D {Currency{f()}};

Since r13-963 we reject this with

<stdin>:8:38: error: =E2=80=98A{(void)0}=E2=80=99 is not a constant express=
ion=