gcc/testsuite/gcc.dg/torture/pr33563.c

/* { dg-do run } */

struct T
{
  int a, b;
} t, q;

int main (void)
{
  struct T *p;

  t.a = 1;
  t.b = 2;
  q = t;
  t.a = 3;

  if (q.a != 1)
    __builtin_abort ();

  return 0;
}