KASSERT
#define KASSERT(exp, msg) assert(exp)
#define KASSERT(exp, msg) assert(exp)
#define KASSERT(e, m)
#undef KASSERT
#define KASSERT(x) _PROP_ASSERT(x)
#define KASSERT(x) /* nothing */
#define KASSERT(exp,msg) do { } while (0)
#define KASSERT(exp,msg) do { if (__predict_false(!(exp))) \
#define KASSERT(c, msg) do { \
#define KASSERT(exp, msg) do { if (!(exp)) panic msg; } while(0)