Function luaT_tryconcatTM

third-party/lua-5.5.0/src/ltm.c:173–177

** The use of 'p1' after 'callbinTM' is safe because, when a tag ** method is not found, 'callbinTM' cannot change the stack. */

** method is not found, 'callbinTM' cannot change the stack.
*/
void luaT_tryconcatTM (lua_State *L) {
  StkId p1 = L->top.p - 2;  /* first argument */
  if (l_unlikely(callbinTM(L, s2v(p1), s2v(p1 + 1), p1, TM_CONCAT) < 0))
    luaG_concaterror(L, s2v(p1), s2v(p1 + 1));
}


void luaT_trybinassocTM (lua_State *L, const TValue *p1, const TValue *p2,