copy/rename to a removed destination file When the destination of a copy or rename operation has been marked for removal, we need to restore it before we overwrite it with the new content. This also handles the case of idempotent renames, i.e. hg rename "a" "b" hg rename "b" "a"

Is there an error message when trying to diff non-existing files?
found: No such file or directory
not: No such file or directory
Is there an error message when trying to add non-existing files?
found: No such file or directory
not: No such file or directory