ref: 4eb0595fdcfb5064a5f81b1ffe4fb2de4c6a3dd3
dir: /tests/execute/0066-cppelse.c/
#define BAR 0
#ifdef BAR
#ifdef FOO
XXX
#ifdef FOO
XXX
#endif
#else
#define FOO
#ifdef FOO
int x = BAR;
#endif
#endif
#endif
int
main()
{
return BAR;
}