$ hg init public

  $ cd public

  $ echo a > a

  $ hg commit -A -m init

  adding a

  $ cd ..

  $ evolvepath=$(echo $(dirname $TESTDIR))/hgext/evolve.py

  $ hg clone -U public private

  $ cd private

  $ cat >> .hg/hgrc <<EOF

  > [extensions]

  > evolve = $evolvepath

  > [phases]

  > publish = false

  > EOF

  $ cd ..

  $ cp -a private alice

  $ cp -a private bob

  $ cd alice

  $ hg update

  1 files updated, 0 files merged, 0 files removed, 0 files unresolved

  $ echo a >> a

  $ hg commit -u alice -m 'modify a'

  $ hg push ../private

  pushing to ../private

  searching for changes

  adding changesets

  adding manifests

  adding file changes

  added 1 changesets with 1 changes to 1 files

  $ hg log -r 'draft()'

  changeset:   1:4d1169d82e47

  tag:         tip

  user:        alice

  date:        Thu Jan 01 00:00:00 1970 +0000

  summary:     modify a

  $ cd ../bob

  $ hg pull ../private

  pulling from ../private

  searching for changes

  adding changesets

  adding manifests

  adding file changes

  added 1 changesets with 1 changes to 1 files

  pull obsolescence markers

  (run 'hg update' to get a working copy)

  $ hg log -r 'draft()'

  changeset:   1:4d1169d82e47

  tag:         tip

  user:        alice

  date:        Thu Jan 01 00:00:00 1970 +0000

  summary:     modify a

  $ hg push ../public

  pushing to ../public

  searching for changes

  adding changesets

  adding manifests

  adding file changes

  added 1 changesets with 1 changes to 1 files

  $ hg log -r 'draft()'

  $ cd ../alice

  $ hg amend -m 'tweak a'

  $ hg pull ../public

  pulling from ../public

  searching for changes

  no changes found

  pull obsolescence markers

  1 new bumped changesets

  $ hg evolve -a

  recreate:[2] tweak a

  atop:[1] modify a

  computing new diff

  committed as 4d1169d82e47

  working directory is now at 4d1169d82e47