ref: 8c3fe74ebda3b3bdd8d1fbd5af3c03de6229c834 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; }