Criss cross merging

  $ hg init criss-cross

  $ cd criss-cross

  $ echo '0 base' > f1

  $ echo '0 base' > f2

  $ hg ci -Aqm '0 base'

  $ echo '1 first change' > f1

  $ hg ci -m '1 first change f1'

  $ hg up -qr0

  $ echo '2 first change' > f2

  $ hg ci -qm '2 first change f2'

  $ hg merge -qr 1

  $ hg ci -m '3 merge'

  $ hg up -qr2

  $ hg merge -qr1

  $ hg ci -qm '4 merge'

  $ echo '5 second change' > f1

  $ hg ci -m '5 second change f1'

  $ echo '6 second change' > f2

  $ hg ci -m '6 second change f2'

  $ hg log -G

  @  changeset:   6:3b08d01b0ab5

  |  tag:         tip

  |  parent:      3:cf89f02107e5

  |  user:        test

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

  |  summary:     6 second change f2

  |

  | o  changeset:   5:adfe50279922

  | |  user:        test

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

  | |  summary:     5 second change f1

  | |

  | o    changeset:   4:7d3e55501ae6

  | |\   parent:      2:40663881a6dd

  | | |  parent:      1:0f6b37dbe527

  | | |  user:        test

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

  | | |  summary:     4 merge

  | | |

  o---+  changeset:   3:cf89f02107e5

  | | |  parent:      2:40663881a6dd

  |/ /   parent:      1:0f6b37dbe527

  | |    user:        test

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

  | |    summary:     3 merge

  | |

  | o  changeset:   2:40663881a6dd

  | |  parent:      0:40494bf2444c

  | |  user:        test

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

  | |  summary:     2 first change f2

  | |

  o |  changeset:   1:0f6b37dbe527

  |/   user:        test

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

  |    summary:     1 first change f1

  |

  o  changeset:   0:40494bf2444c

     user:        test

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

     summary:     0 base

  $ hg merge -v --debug --tool internal:dump 5

    searching for copies back to rev 3

  resolving manifests

   branchmerge: True, force: False, partial: False

   ancestor: 0f6b37dbe527, local: 3b08d01b0ab5+, remote: adfe50279922

   f1: remote is newer -> g

   f2: versions differ -> m

    preserving f2 for resolve of f2

  getting f1

  updating: f1 1/2 files (50.00%)

  updating: f2 2/2 files (100.00%)

  picked tool 'internal:dump' for f2 (binary False symlink False)

  merging f2

  my f2@3b08d01b0ab5+ other f2@adfe50279922 ancestor f2@40494bf2444c

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

  use 'hg resolve' to retry unresolved file merges or 'hg update -C .' to abandon

  [1]

  $ head *

  ==> f1 <==

  5 second change

  ==> f2 <==

  6 second change

  ==> f2.base <==

  0 base

  ==> f2.local <==

  6 second change

  ==> f2.orig <==

  6 second change

  ==> f2.other <==

  2 first change

  $ cd ..