139   if (ttisnil(key)) return -1;  /* first iteration */  in findindex()
165     if (!ttisnil(&t->array[i])) {  /* a non-nil value? */  in luaH_next()
172     if (!ttisnil(gval(gnode(t, i)))) {  /* a non-nil value? */  in luaH_next()
237       if (!ttisnil(&t->array[i-1]))  in numusearray()
253     if (!ttisnil(gval(n))) {  in numusehash()
310       if (!ttisnil(&t->array[i]))  in resize()
319     if (!ttisnil(gval(old)))  in resize()
384     if (ttisnil(gkey(t->lastfree)))  in getfreepos()
401   if (!ttisnil(gval(mp)) || mp == dummynode) {  in newkey()
427   lua_assert(ttisnil(gval(mp)));  in newkey()
500     if (ttisnil(key)) luaG_runerror(L, "table index is nil");  in luaH_set()
536   while (!ttisnil(luaH_getnum(t, j))) {  in unbound_search()
542       while (!ttisnil(luaH_getnum(t, i))) i++;  in unbound_search()
549     if (ttisnil(luaH_getnum(t, m))) j = m;  in unbound_search()
562   if (j > 0 && ttisnil(&t->array[j - 1])) {  in luaH_getn()
567       if (ttisnil(&t->array[m - 1])) j = m;  in luaH_getn()