CACHE_FPL_SUPPORTED_CN_FLAGS
_Static_assert((CACHE_FPL_SUPPORTED_CN_FLAGS & CACHE_FPL_INTERNAL_CN_FLAGS) == 0,
if ((cnp->cn_flags & ~CACHE_FPL_SUPPORTED_CN_FLAGS) != 0) {
_Static_assert((CACHE_FPL_SUPPORTED_CN_FLAGS & RBENEATH) == 0,