From patchwork Tue Jan  7 01:00:23 2020
Content-Type: text/plain; charset="utf-8"
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit
Subject: D7805: graft: don't remove from a list in a loop
From: phabricator <phabricator@mercurial-scm.org>
X-Patchwork-Id: 44169
Message-Id: <differential-rev-PHID-DREV-ebn4q6vhnbaluj23ab6c-req@mercurial-scm.org>
To: Phabricator <phabricator@mercurial-scm.org>
Cc: mercurial-devel@mercurial-scm.org
Date: Tue, 7 Jan 2020 01:00:23 +0000

martinvonz created this revision.
Herald added a subscriber: mercurial-devel.
Herald added a reviewer: hg-reviewers.

REVISION SUMMARY
  This addresses a TODO added in a1381eea7c7d <https://phab.mercurial-scm.org/rHGa1381eea7c7d3ee8a92b4d9fcc403b4b518aa56c> (graft: do not use
  `.remove` on a smart set (regression), 2014-04-28). I couldn't measure
  any speedup.

REPOSITORY
  rHG Mercurial

BRANCH
  default

REVISION DETAIL
  https://phab.mercurial-scm.org/D7805

AFFECTED FILES
  mercurial/commands.py

CHANGE DETAILS




To: martinvonz, #hg-reviewers
Cc: mercurial-devel

diff --git a/mercurial/commands.py b/mercurial/commands.py
--- a/mercurial/commands.py
+++ b/mercurial/commands.py
@@ -3080,14 +3080,13 @@
         crev = repo[b'.'].rev()
         ancestors = repo.changelog.ancestors([crev], inclusive=True)
         # XXX make this lazy in the future
-        # don't mutate while iterating, create a copy
-        for rev in list(revs):
+        for rev in revs:
             if rev in ancestors:
                 ui.warn(
                     _(b'skipping ancestor revision %d:%s\n') % (rev, repo[rev])
                 )
-                # XXX remove on list is slow
-                revs.remove(rev)
+        revs = [r for r in revs if r not in ancestors]
+
         if not revs:
             return -1