gcc/testsuite/gcc.c-torture/compile/pr40321.c

   1 struct X { int flag; int pos; };
   2 int foo(struct X *a, struct X *b)
   3 {
   4   while (1)
   5     {
   6       if (a->flag)
   7         break;
   8       ({ struct X *tmp = a; a = b; b = tmp; });
   9     }
  10
  11   return a->pos + b->pos;
  12 }