Function luaL_argerror

depends/lua/src/lauxlib.c:164–179

*/

LUALIB_API int luaL_argerror (lua_State *L, int arg, const char *extramsg) {
  lua_Debug ar;
  if (!lua_getstack(L, 0, &ar))  /* no stack frame? */
    return luaL_error(L, "bad argument #%d (%s)", arg, extramsg);
  lua_getinfo(L, "n", &ar);
  if (strcmp(ar.namewhat, "method") == 0) {
    arg--;  /* do not count 'self' */
    if (arg == 0)  /* error is in the self argument itself? */
      return luaL_error(L, "calling '%s' on bad self (%s)",
                           ar.name, extramsg);
  }
  if (ar.name == NULL)
    ar.name = (pushglobalfuncname(L, &ar)) ? lua_tostring(L, -1) : "?";
  return luaL_error(L, "bad argument #%d to '%s' (%s)",
                        arg, ar.name, extramsg);
}


static int typeerror (lua_State *L, int arg, const char *tname) {