[Bug c++/70347] New: [5.x Regression] default member initializer not picked up by union

[lichray at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70347

            Bug ID: 70347
           Summary: [5.x Regression] default member initializer not picked
                    up by union
           Product: gcc
           Version: 5.3.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: lichray at gmail dot com
  Target Milestone: ---

#include <iostream>

  //struct A {
   union A {
     int a = 3;
     int b;
   };
  //};

  int main() {
     A c{};
     std::cout << c.a << "\n";
  }

Prints 0 in 5.x, 3 in 4.9.2, same for anonymous union.