Minor fix for revert: No need to make a backup when forgetting added files. echo foo > foo && hg add foo && hg revert foo creates foo.orig, though foo is not changed or deleted.

#!/bin/sh

mkdir t
cd t
hg init
echo a > a
hg add a
hg commit -m "test" -d "1000000 0"
hg verify
hg parents
hg status
hg undo
hg verify
hg parents
hg status