ref: c679d867ba0e7d6c4ebbd82649d0eed8a4fe0c2a dir: /tests/execute/0037-assignop.c/
int main() { int x; x = 0; x += 2; x += 2; if (x != 4) return 1; x -= 3; if (x != 1) return 2; return 0; }