$ hg rename a b $ hg diff diff -r b01d46ff402d a --- a/a Fri Jun 05 15:49:22 2009 +0000 +++ /dev/null Thu Jan 01 00:00:00 1970 +0000 @@ -1,1 +0,0 @@ -a diff -r b01d46ff402d b --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/b Fri Jun 05 15:49:23 2009 +0000 @@ -0,0 +1,1 @@ +a