+ hg init
+ hg add file1 file2
+ hg commit -m added file1 and file2 -d 0 0 -u user
+ hg commit -m changed file1 -d 0 0 -u user
+ hg -q log
1:3aa14bbc23d90e3f8b5b639b4a43d76509bae76c
0:8633637036c18f021d771208e16ae3508ab81d28
+ hg id
3aa14bbc23d9 tip
+ hg update -C 0
+ hg id
8633637036c1
+ hg id
8633637036c1+
+ hg revert
+ hg diff
+ hg status
+ hg id
8633637036c1
+ hg update
+ hg diff
+ hg status
+ hg id
3aa14bbc23d9 tip
+ hg update -C 0
+ hg update
merge: warning: conflicts during merge
merging file1
merging file1 failed!
+ hg diff
diff -r 3aa14bbc23d9 file1
--- a/file1
+++ b/file1
@@ -1,2 +1,6 @@
 added file1
+<<<<<<<
+changed file1 different
+=======
 changed file1
+>>>>>>>
+ hg status
M file1
+ hg id
3aa14bbc23d9+ tip
+ hg revert
+ hg diff
FIXME: This is a known bug:
+ hg status
+ hg id
3aa14bbc23d9 tip
+ hg revert -r tip
+ hg diff
+ hg status
+ hg id
3aa14bbc23d9 tip
+ hg update -C
+ hg diff
+ hg status
+ hg id
3aa14bbc23d9 tip