lonely-tiger/tests/pre/replace

#define MAIN main wusi
#undef MAIN
#define MAIN main
#define V void
#define N_W 3
#define HMM V MAIN

#define A B
#define B A

HMM() {
    test(N_W);
#undef N_W
#define N_W 5
    test(N_W);
}