MSVC zero size types

[TwoClocks]

compiler exploer says MSVC is ok w/ this

typedef int J[];

struct J_extra_alignment {
    char a;
    J b;
};
struct J_extra_alignment var83;

_Static_assert(sizeof(J) == 0, "");
_Static_assert(_Alignof(J) == 4, "");

AROCC says

❯ ./zig-out/bin/arocc --emulate=msvc test.c
./cur.c:7:26: error: variable has incomplete type 'struct J_extra_alignment'
struct J_extra_alignment var83;
                         ^
1 error generated.