LUAI_THROW
#define LUAI_THROW(L,c) longjmp(&(c)->b)
#define LUAI_THROW(L,c) throw(c)
#define LUAI_THROW(L,c) _longjmp((c)->b, 1)
#define LUAI_THROW(L,c) longjmp((c)->b, 1)
