$ mkdir t

  $ cd t

  $ hg init

  $ mkdir a

  $ echo foo > a/a

  $ echo bar > a/b

  $ hg ci -Am "0"

  adding a/a

  adding a/b

  $ hg co -C 0

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

  $ hg mv a b

  moving a/a to b/a

  moving a/b to b/b

  $ hg ci -m "1 mv a/ b/"

  $ hg co -C 0

  2 files updated, 0 files merged, 2 files removed, 0 files unresolved

  $ echo baz > a/c

  $ echo quux > a/d

  $ hg add a/c

  $ hg ci -m "2 add a/c"

  created new head

  $ hg merge --debug 1

    searching for copies back to rev 1

    unmatched files in local:

     a/c

     a/d

    unmatched files in other:

     b/a

     b/b

    all copies found (* = to merge, ! = divergent):

     b/a -> a/a 

     b/b -> a/b 

    checking for directory renames

    dir a/ -> b/

    file a/c -> b/c

    file a/d -> b/d

  resolving manifests

   overwrite None partial False

   ancestor f9b20c0d4c51 local ce36d17b18fb+ remote 397f8b00a740

   a/d: remote renamed directory to b/d -> d

   a/c: remote renamed directory to b/c -> d

   a/b: other deleted -> r

   a/a: other deleted -> r

   b/a: remote created -> g

   b/b: remote created -> g

  updating: a/a 1/6 files (16.67%)

  removing a/a

  updating: a/b 2/6 files (33.33%)

  removing a/b

  updating: a/c 3/6 files (50.00%)

  moving a/c to b/c

  updating: a/d 4/6 files (66.67%)

  moving a/d to b/d

  updating: b/a 5/6 files (83.33%)

  getting b/a

  updating: b/b 6/6 files (100.00%)

  getting b/b

  4 files updated, 0 files merged, 2 files removed, 0 files unresolved

  (branch merge, don't forget to commit)

  $ echo a/* b/*

  a/* b/a b/b b/c b/d

  $ hg st -C

  M b/a

  M b/b

  A b/c

    a/c

  R a/a

  R a/b

  R a/c

  ? b/d

  $ hg ci -m "3 merge 2+1"

  $ hg debugrename b/c

  b/c renamed from a/c:354ae8da6e890359ef49ade27b68bbc361f3ca88

  $ hg co -C 1

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

  $ hg merge --debug 2

    searching for copies back to rev 1

    unmatched files in local:

     b/a

     b/b

     b/d

    unmatched files in other:

     a/c

    all copies found (* = to merge, ! = divergent):

     b/a -> a/a 

     b/b -> a/b 

    checking for directory renames

    dir a/ -> b/

    file a/c -> b/c

  resolving manifests

   overwrite None partial False

   ancestor f9b20c0d4c51 local 397f8b00a740+ remote ce36d17b18fb

   None: local renamed directory to b/c -> d

  updating:None 1/1 files (100.00%)

  getting a/c to b/c

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

  (branch merge, don't forget to commit)

  $ echo a/* b/*

  a/* b/a b/b b/c b/d

  $ hg st -C

  A b/c

    a/c

  ? b/d

  $ hg ci -m "4 merge 1+2"

  created new head

  $ hg debugrename b/c

  b/c renamed from a/c:354ae8da6e890359ef49ade27b68bbc361f3ca88