$ hg init $ echo "nothing" > a $ hg add a $ hg commit -m ancestor $ echo "something" > a $ hg commit -m branch1 $ hg co 0 1 files updated, 0 files merged, 0 files removed, 0 files unresolved $ echo "something else" > a $ hg commit -m branch2 created new head $ hg merge 1 merging a warning: conflicts during merge. merging a failed! 0 files updated, 0 files merged, 0 files removed, 1 files unresolved use 'hg resolve' to retry unresolved file merges or 'hg update -C .' to abandon [1] $ hg id 32e80765d7fe+75234512624c+ tip $ cat a <<<<<<< local something else ======= something >>>>>>> other $ hg status M a ? a.orig