ref: 72996baa32cf2e7d7e26bbc3cca1ca4340a35f7d 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; }