[Bug c++/64428] New: aggregate with const member as union member [C++03]

[R.HL at gmx dot net]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64428

            Bug ID: 64428
           Summary: aggregate with const member as union member [C++03]
           Product: gcc
           Version: 5.0
            Status: UNCONFIRMED
          Severity: minor
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: R.HL at gmx dot net

struct A
{
    const int b;
};

union U
{
    A a;
};

int main()
{
    U a = {1, 1};
}

Fails to compile using -std=c++03, although it should. Consider that no special
member function apart from the destructor is implicitly defined, and the
trivialty of them is preserved.