Yep.  I tried to rephrase this to work for the temporary scope case but I couldn't come up with a phrasing I liked.  On top of that, I'd consider using `with_temporary_scope` to be an "advanced" feature of rspec-mocks.  I think a newcomer (who has no idea what "an rspec-mocks scope" is) is more likely to be confused by a message worded in those terms than someone using `with_temporary_scope` being confused by this message.

Anyhow, I'm open to alternate phrasings if you have an idea. I was also thinking it could be good to mention `with_temporary_scope` in the messages raised from `RootSpace` so people know that's available but I couldn't come up with a good way to include that in the message.  Any ideas?