$ hg init t

  $ cd t

  $ 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 (glob)

  moving a/b to b/b (glob)

  $ 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

    unmatched files in other:

     b/a

     b/b

    all copies found (* = to merge, ! = divergent, % = renamed and deleted):

     src: 'a/a' -> dst: 'b/a' 

     src: 'a/b' -> dst: 'b/b' 

    checking for directory renames

     discovered dir src: 'a/' -> dst: 'b/'

     pending file src: 'a/c' -> dst: 'b/c'

  resolving manifests

   branchmerge: True, force: False, partial: False

   ancestor: f9b20c0d4c51, local: ce36d17b18fb+, remote: 397f8b00a740

   a/a: other deleted -> r

   a/b: other deleted -> r

  removing a/b

  updating: a/b 2/5 files (40.00%)

  getting b/a

  getting b/b

  updating: b/b 4/5 files (80.00%)

  updating: b/c 5/5 files (100.00%)

  moving a/c to b/c (glob)

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

  (branch merge, don't forget to commit)

  $ echo a/* b/*

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

  $ hg st -C

  M b/a

  M b/b

  A b/c

    a/c

  R a/a

  R a/b

  R a/c

  ? a/d

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

  $ hg debugrename b/c

  b/c renamed from a/c:354ae8da6e890359ef49ade27b68bbc361f3ca88 (glob)

  $ 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

    unmatched files in other:

     a/c

    all copies found (* = to merge, ! = divergent, % = renamed and deleted):

     src: 'a/a' -> dst: 'b/a' 

     src: 'a/b' -> dst: 'b/b' 

    checking for directory renames

     discovered dir src: 'a/' -> dst: 'b/'

     pending file src: 'a/c' -> dst: 'b/c'

  resolving manifests

   branchmerge: True, force: False, partial: False

   ancestor: f9b20c0d4c51, local: 397f8b00a740+, remote: ce36d17b18fb

   b/c: local directory rename - get from a/c -> dg

  updating: b/c 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/d b/a b/b b/c

  $ hg st -C

  A b/c

    a/c

  ? a/d

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

  created new head

  $ hg debugrename b/c

  b/c renamed from a/c:354ae8da6e890359ef49ade27b68bbc361f3ca88 (glob)

Second scenario with two repos:

  $ cd ..

  $ hg init r1

  $ cd r1

  $ mkdir a

  $ echo foo > a/f

  $ hg add a

  adding a/f (glob)

  $ hg ci -m "a/f == foo"

  $ cd ..

  $ hg clone r1 r2

  updating to branch default

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

  $ cd r2

  $ hg mv a b

  moving a/f to b/f (glob)

  $ echo foo1 > b/f

  $ hg ci -m" a -> b, b/f == foo1"

  $ cd ..

  $ cd r1

  $ mkdir a/aa

  $ echo bar > a/aa/g

  $ hg add a/aa

  adding a/aa/g (glob)

  $ hg ci -m "a/aa/g"

  $ hg pull ../r2

  pulling from ../r2

  searching for changes

  adding changesets

  adding manifests

  adding file changes

  added 1 changesets with 1 changes to 1 files (+1 heads)

  (run 'hg heads' to see heads, 'hg merge' to merge)

  $ hg merge

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

  (branch merge, don't forget to commit)

  $ hg st -C

  M b/f

  A b/aa/g

    a/aa/g

  R a/aa/g

  R a/f

  $ cd ..