[Bug c++/91081] New: [DR 2120] Array as first non-static data member in standard-layout class

[mpolacek at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91081

            Bug ID: 91081
           Summary: [DR 2120] Array as first non-static data member in
                    standard-layout class
           Product: gcc
           Version: 10.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: mpolacek at gcc dot gnu.org
  Target Milestone: ---

Cf. https://wg21.link/cwg2120

Test:

struct A {};
struct B : A {};
struct C { A a; };
struct D { C c[5]; };
struct E : B { D d; };
static_assert(__is_standard_layout(B), "");
static_assert(__is_standard_layout(D), "");
static_assert(!__is_standard_layout(E), "");