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
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- hg 2 additions, 0 deletionshg
- hgdemandimport/__init__.py 1 addition, 0 deletionshgdemandimport/__init__.py
- hgdemandimport/demandimportpy3.py 2 additions, 0 deletionshgdemandimport/demandimportpy3.py
- hgdemandimport/tracing.py 2 additions, 0 deletionshgdemandimport/tracing.py
- hgext/__init__.py 2 additions, 0 deletionshgext/__init__.py
- hgext/absorb.py 1 addition, 0 deletionshgext/absorb.py
- hgext/acl.py 1 addition, 0 deletionshgext/acl.py
- hgext/amend.py 1 addition, 0 deletionshgext/amend.py
- hgext/automv.py 1 addition, 0 deletionshgext/automv.py
- hgext/beautifygraph.py 1 addition, 0 deletionshgext/beautifygraph.py
- hgext/blackbox.py 1 addition, 0 deletionshgext/blackbox.py
- hgext/bookflow.py 2 additions, 0 deletionshgext/bookflow.py
- hgext/bugzilla.py 1 addition, 0 deletionshgext/bugzilla.py
- hgext/censor.py 1 addition, 0 deletionshgext/censor.py
- hgext/children.py 1 addition, 0 deletionshgext/children.py
- hgext/churn.py 1 addition, 0 deletionshgext/churn.py
- hgext/clonebundles.py 1 addition, 0 deletionshgext/clonebundles.py
- hgext/closehead.py 1 addition, 0 deletionshgext/closehead.py
- hgext/commitextras.py 1 addition, 0 deletionshgext/commitextras.py
- hgext/convert/__init__.py 1 addition, 0 deletionshgext/convert/__init__.py
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