$ pijul init p1
$ cd p1
$ pijul fork m
$ pijul channel switch m
$ touch a
$ pijul add a
$ pijul rec -am.
Hash: TDOALAIKJGA4CK5HVVNWX3B22V653B3QDFMNFMS4WYFVLIHV2BJAC
$ pijul channel switch main
$ pijul tag create -m. --channel m
Error: Cannot change channel, as there are unrecorded changes.
$