$ mkdir t
$ cd t
$ hg init
$ echo 1 > a
$ hg ci -qAm "first" -d "1000000 0"
$ hg cp a b
$ hg mv a c
$ echo 2 >> b
$ echo 2 >> c
$ hg ci -qAm "second" -d "1000000 0"
$ hg co -C 0
1 files updated, 0 files merged, 2 files removed, 0 files unresolved
$ echo 0 > a
$ echo 1 >> a
$ hg ci -qAm "other" -d "1000000 0"
$ hg merge --debug
searching for copies back to rev 1
unmatched files in other:
b
c
all copies found (* = to merge, ! = divergent):
c -> a *
b -> a *
checking for directory renames
resolving manifests
overwrite None partial False
ancestor 583c7b748052 local fb3948d97f07+ remote 7f1309517659
a: remote moved to c -> m
a: remote moved to b -> m
preserving a for resolve of b
preserving a for resolve of c
removing a
updating: a 1/2 files (50.00%)
picked tool 'internal:merge' for b (binary False symlink False)
merging a and b to b
my b@fb3948d97f07+ other b@7f1309517659 ancestor a@583c7b748052
premerge successful
updating: a 2/2 files (100.00%)
picked tool 'internal:merge' for c (binary False symlink False)
merging a and c to c
my c@fb3948d97f07+ other c@7f1309517659 ancestor a@583c7b748052
premerge successful
0 files updated, 2 files merged, 0 files removed, 0 files unresolved
(branch merge, don't forget to commit)
file b
$ cat b
0
1
2
file c
$ cat c
0
1
2