cleanup: run pyupgrade on our source tree to clean up varying things Built with: hg files 'set:**.py - mercurial/thirdparty/** - "contrib/python-zstandard/**" - hgext/fsmonitor/pywatchman/**' | xargs pyupgrade --keep-percent-format --keep-extraneous-parens and then blackened. pyupgrade comes from https://github.com/asottile/pyupgrade with a patch to let me preserve extraneous parens (which we use for marking strings that shouldn't be translated), and lets us clean up a bunch of idioms that have cruftily accumulated over the years. # skip-blame no-op automated code cleanups Differential Revision: https://phab.mercurial-scm.org/D8255

--- a/tests/simplestorerepo.py	Fri Mar 06 10:52:44 2020 +0100
+++ b/tests/simplestorerepo.py	Fri Mar 06 13:27:41 2020 -0500
@@ -588,7 +588,7 @@
             start = nullid
         if stop is None:
             stop = []
-        stoprevs = set([self.rev(n) for n in stop])
+        stoprevs = {self.rev(n) for n in stop}
         startrev = self.rev(start)
         reachable = {startrev}
         heads = {startrev}