Function lua_toclose

third-party/lua-5.5.0/src/lapi.c:1283–1291

LUA_API void lua_toclose (lua_State *L, int idx) {
  StkId o;
  lua_lock(L);
  o = index2stack(L, idx);
  api_check(L, L->tbclist.p < o, "given index below or equal a marked one");
  luaF_newtbcupval(L, o);  /* create new to-be-closed upvalue */
  L->ci->callstatus |= CIST_TBC;  /* mark that function has TBC slots */
  lua_unlock(L);
}


LUA_API void lua_concat (lua_State *L, int n) {