<< ".";
    return false;
  }

  FunctionLibraryRuntime::Handle handle;
  Status s;
  NameAttrList function;
  s = NameAndAttrsFromFunctionCall(call_def, &function);
  if (s.ok()) {
    s = lib_runtime->Instantiate(function.name(), AttrSlice(&function.attr()),
                                 &handle);
  }
  if (!s.ok()) {