luaV_concat
luaV_concat(L, n);
if (n > 0) luaV_concat(L, n + 1);
luaV_concat(L, total); /* concat them (may yield again) */
Protect(luaV_concat(L, c - b + 1));
LUAI_FUNC void luaV_concat (lua_State *L, int total);