https://bz.mercurial-scm.org/1175

  $ hg init

  $ touch a

  $ hg ci -Am0

  adding a

  $ hg mv a a1

  $ hg ci -m1

  $ hg co 0

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

  $ hg mv a a2

  $ hg up

  note: possible conflict - a was renamed multiple times to:

   a2

   a1

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

  $ hg ci -m2

  $ touch a

  $ hg ci -Am3

  adding a

  $ hg mv a b

  $ hg ci -Am4 a

  $ hg ci --debug --traceback -Am5 b

  committing files:

  b

  warning: can't find ancestor for 'b' copied from 'a'!

  committing manifest

  committing changelog

  committed changeset 5:83a687e8a97c80992ba385bbfd766be181bfb1d1

  $ hg verify

  checking changesets

  checking manifests

  crosschecking files in changesets and manifests

  checking files

  4 files, 6 changesets, 4 total revisions

  $ hg export --git tip

  # HG changeset patch

  # User test

  # Date 0 0

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

  # Node ID 83a687e8a97c80992ba385bbfd766be181bfb1d1

  # Parent  1d1625283f71954f21d14c3d44d0ad3c019c597f

  5

  diff --git a/b b/b

  new file mode 100644

http://bz.selenic.com/show_bug.cgi?id=4476

  $ hg init foo

  $ cd foo

  $ touch a && hg ci -Aqm a

  $ hg mv a b

  $ echo b1 >> b

  $ hg ci -Aqm b1

  $ hg up 0

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

  $ hg mv a b

  $ echo b2 >> b

  $ hg ci -Aqm b2

  $ hg graft 1

  grafting 1:5974126fad84 "b1"

  merging b

  warning: conflicts while merging b! (edit, then use 'hg resolve --mark')

  abort: unresolved conflicts, can't continue

  (use hg resolve and hg graft --continue)

  [255]

  $ echo a > b

  $ echo b3 >> b

  $ hg resolve --mark b

  (no more unresolved files)

  $ hg graft --continue

  grafting 1:5974126fad84 "b1"

  warning: can't find ancestor for 'b' copied from 'a'!

  $ hg log -f b -T 'changeset:   {rev}:{node|short}\nsummary:     {desc}\n\n'

  changeset:   3:376d30ccffc0

  summary:     b1

  changeset:   2:416baaa2e5e4

  summary:     b2

  changeset:   0:3903775176ed

  summary:     a