ref: 495f9ed1829ea0843bf1cc5395d1f7fd9a8a6c9b dir: /tests/cc/execute/0055-enum.c/
enum E { x, y, z, }; int main() { enum E e; if(x != 0) return 1; if(y != 1) return 2; if(z != 2) return 3; e = x; return e; }