$ cat >> $HGRCPATH <<EOF
  > [web]
  > push_ssl = false
  > allow_push = *
  > [extensions]
  > EOF
  $ echo "states=$(echo $(dirname $TESTDIR))/obsolete.py" >> $HGRCPATH
  $ mkcommit() {
  >    echo "$1" > "$1"
  >    hg add "$1"
  >    hg ci -m "add $1"
  > }

  $ hg init repo
  $ cd repo
  $ mkcommit a # 0
  $ mkcommit b # 1
  $ mkcommit c # 2
  $ hg up 1
  0 files updated, 0 files merged, 1 files removed, 0 files unresolved
  $ mkcommit obsol_c # 3
  created new head
  $ hg debugobsolete 3 2
  $ hg log
  changeset:   3:0d3f46688ccc
  tag:         tip
  parent:      1:7c3bad9141dc
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     add obsol_c
  
  changeset:   1:7c3bad9141dc
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     add b
  
  changeset:   0:1f0dee641bb7
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     add a
  
  $ hg log --hidden
  changeset:   3:0d3f46688ccc
  tag:         tip
  parent:      1:7c3bad9141dc
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     add obsol_c
  
  changeset:   2:4538525df7e2
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     add c
  
  changeset:   1:7c3bad9141dc
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     add b
  
  changeset:   0:1f0dee641bb7
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     add a