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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/102013] Incorrect aggregate initialization of union
Date: Mon, 23 Aug 2021 23:06:32 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D102013

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
This is interesting:
struct A { int x =3D 6; };
struct B { int x =3D 3; };
union U {
    A a;
    B b;
};
static_assert (U{}.a.x=3D=3D6);
U a{};
int main() {
    if (a.a.x !=3D 6)
      __builtin_abort();
}

The static_assert works ....=