typing: add `from __future__ import annotations` to most files Now that py36 is no longer supported, we can postpone annotation evaluation. This means that the quoting is usually optional (for things imported under the guard of `if typing.TYPE_CHECKING:` to avoid circular imports), and there's less overhead on startup[1]. There may be some missing here. I backed out 6000f5b25c9b (which removed the `from __future__ import ...` that was supporting py2), reverted the changes in `contrib/`, `doc/`, and `tests/`, and then ran: $ hg status -n --change . | \ xargs sed -i -e 's/from __future__ import .*$/from __future__ import annotations/' There were some minor tweaks needed when reviewing (mostly making the spacing around the import consistent, and `mercurial/testing/__init__.py` had a multiline import that wasn't fully rewritten. [1] https://docs.python.org/3/whatsnew/3.7.html#pep-563-postponed-evaluation-of-annotations

     1

# Copyright 2016-present Facebook. All Rights Reserved.

     2

#

     3

# error: errors used in fastannotate

     4

#

     5

# This software may be used and distributed according to the terms of the

     6

# GNU General Public License version 2 or any later version.

     7

from __future__ import annotations

     8

     9

    10

class CorruptedFileError(Exception):

    11

    pass

    12

    13

    14

class CannotReuseError(Exception):

    15

    """cannot reuse or update the cache incrementally"""