$ cat >> $HGRCPATH <<EOF

  > [extensions]

  > graphlog=

  > rebase=

  > 

  > [alias]

  > tglog = log -G --template "{rev}: '{desc}' {branches}\n"

  > EOF

  $ hg init a

  $ cd a

  $ echo c1 > common

  $ hg add common

  $ hg ci -m C1

  $ echo c2 >> common

  $ hg ci -m C2

  $ echo c3 >> common

  $ hg ci -m C3

  $ hg up -q -C 1

  $ echo l1 >> extra

  $ hg add extra

  $ hg ci -m L1

  created new head

  $ sed -e 's/c2/l2/' common > common.new

  $ mv common.new common

  $ hg ci -m L2

  $ hg tglog

  @  4: 'L2'

  |

  o  3: 'L1'

  |

  | o  2: 'C3'

  |/

  o  1: 'C2'

  |

  o  0: 'C1'

Conflicting rebase:

  $ hg rebase -s 3 -d 2

  merging common

  warning: conflicts during merge.

  merging common failed!

  [255]

Abort:

  $ hg rebase --abort

  saved backup bundle to $TESTTMP/a/.hg/strip-backup/*-backup.hg (glob)

  rebase aborted

  $ hg tglog

  @  4: 'L2'

  |

  o  3: 'L1'

  |

  | o  2: 'C3'

  |/

  o  1: 'C2'

  |

  o  0: 'C1'

  $ cd ..

Constrcut new repo:

  $ hg init b

  $ cd b

  $ echo a > a

  $ hg ci -Am A

  adding a

  $ echo b > b

  $ hg ci -Am B

  adding b

  $ echo c > c

  $ hg ci -Am C

  adding c

  $ hg up -q 0

  $ echo b > b

  $ hg ci -Am 'B bis'

  adding b

  created new head

  $ echo c1 > c

  $ hg ci -Am C1

  adding c

Rebase and abort without generating new changesets:

  $ hg tglog

  @  4: 'C1'

  |

  o  3: 'B bis'

  |

  | o  2: 'C'

  | |

  | o  1: 'B'

  |/

  o  0: 'A'

  $ hg rebase -b 4 -d 2

  merging c

  warning: conflicts during merge.

  merging c failed!

  [255]

  $ hg tglog

  @  4: 'C1'

  |

  o  3: 'B bis'

  |

  | @  2: 'C'

  | |

  | o  1: 'B'

  |/

  o  0: 'A'

  $ hg rebase -a

  rebase aborted

  $ hg tglog

  @  4: 'C1'

  |

  o  3: 'B bis'

  |

  | o  2: 'C'

  | |

  | o  1: 'B'

  |/

  o  0: 'A'