ref: 9cdf8d4b4c9ecf24e8e065fdbf9a6aea48d5f4af dir: /tests/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; }