ref: 83bd84e42a0dd0d049e1c8a8dbb7ee52cdfa0b9d 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; }