/* { dg-do run } */extern void abort(void);typedef struct Foo { int a; int b; }  Foo;Foo foo(Foo first, Foo last, _Bool ret_first){  Foo t;  Foo *t1 = (ret_first ? &first : &last);  first.a = 2;  last.b = 3;  t.a = t1->a;  t.b = t1->b;  t.a += first.a;  t.b += last.b;  return t;}int main(){  Foo first = (Foo){1, 2};  Foo last = (Foo){3, 4};  Foo ret = foo(first, last, 0);  if (ret.b != 6)    abort ();  return 0;}