Merge "Clarify error message when signature in list.txt does not exist."

    def _check_entries_set(self, keys_subset, source):

        assert isinstance(keys_subset, set)

        assert keys_subset.issubset(self._dict_keyset), (

            "Error processing: {}\n"

            "The following entries were unexpected:\n"

            "Error: {} specifies signatures not present in code:\n"

            "{}"

            "Please visit go/hiddenapi for more information.").format(

                source, "".join(map(lambda x: "  " + str(x), keys_subset - self._dict_keyset)))

                source, "".join(map(lambda x: "  " + str(x) + "\n", keys_subset - self._dict_keyset)))

    def _check_flags_set(self, flags_subset, source):

        assert isinstance(flags_subset, set)