isdead
if (isdead(g, o)) /* is it dead? */
if (isdead(g, o))
lua_assert(isblack(o) && iswhite(v) && !isdead(g, v) && !isdead(g, o));
lua_assert(isblack(o) && !isdead(g, o) && gch(o)->tt == LUA_TTABLE);
(righttt(obj) && !isdead(g,gcvalue(obj))))
if (isdead(G(L), o)) /* string is dead (but was not collected yet)? */