ref: b7f42e58b25d64fa8a03e8ac06a5f5e5e92c552a dir: /tests/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; }