Function luaF_unlinkupval

extlibs/lua/src/lfunc.c:215–220

void luaF_unlinkupval (UpVal *uv) {
  lua_assert(upisopen(uv));
  *uv->u.open.previous = uv->u.open.next;
  if (uv->u.open.next)
    uv->u.open.next->u.open.previous = uv->u.open.previous;
}


int luaF_close (lua_State *L, StkId level, int status) {