py3: use native string when comparing with a function's argspec
I only found two such bugs in `contrib/perf.py`
Differential Revision: https://phab.mercurial-scm.org/D9149
# Copyright 2016-present Facebook. All Rights Reserved.
#
# error: errors used in fastannotate
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.
from __future__ import absolute_import
class CorruptedFileError(Exception):
pass
class CannotReuseError(Exception):
"""cannot reuse or update the cache incrementally"""