Given the following workspace:

foo
bar/

and the following actions on this workspace

$ mtn mv bar/ baz/
$ mtn mv foo bar

both commands, mtn ls unknown and mtn ls missing keep completly quite, while mtn ls changed warns about "bar not being a directory" and advices the usage of mtn revert.

Derek Scherger once proposed of having a separate mtn ls invalid command for these things, but I'm not sure if another command would be such helpful. I think the existing commands should be able to detect such discrepancies as well.