ref: 2b85cb9a6ffdbe1354527e6b67ba0c95fb80fd6f 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; }