+ hg init
+ echo a
+ hg add a
+ hg commit -t 1 -u test -d '0 0'
+ hg status
? .out
+ cp a b
+ hg copy a b
+ hg status
A b
? .out
+ hg --debug commit -t 2 -u test -d '0 0'
b
 b: copy a:b789fdd96dc2f3bd229c1dd8eedf0fc60e2b68e3
+ hg history
changeset:   1:3b5b84850bbed12e8ff8c1b87b32dc93c59ae6d8
tag:         tip
user:        test
date:        Thu Jan  1 00:00:00 1970
summary:     2

changeset:   0:c19d34741b0a4ced8e4ba74bb834597d5193851e
user:        test
date:        Thu Jan  1 00:00:00 1970
summary:     1

+ hg log a
revision:    0:b789fdd96dc2f3bd229c1dd8eedf0fc60e2b68e3
changeset:   0:c19d34741b0a4ced8e4ba74bb834597d5193851e
user:        test
date:        Thu Jan  1 00:00:00 1970
summary:     1

+ hexdump -C .hg/data/b.d
00000000  75 01 0a 63 6f 70 79 72  65 76 3a 20 62 37 38 39  |u..copyrev: b789|
00000010  66 64 64 39 36 64 63 32  66 33 62 64 32 32 39 63  |fdd96dc2f3bd229c|
00000020  31 64 64 38 65 65 64 66  30 66 63 36 30 65 32 62  |1dd8eedf0fc60e2b|
00000030  36 38 65 33 0a 63 6f 70  79 3a 20 61 0a 01 0a 61  |68e3.copy: a...a|
00000040  0a                                                |.|
00000041
+ hg cat b
+ md5sum bsum
60b725f10c9c85c70d97880dfe8191b3  bsum
+ hg cat a
+ md5sum asum
60b725f10c9c85c70d97880dfe8191b3  asum
+ hg verify
checking changesets
checking manifests
crosschecking files in changesets and manifests
checking files
2 files, 2 changesets, 2 total revisions