>Why didn't you introduce a new variable tramp-copy-failed-regexp? This
>would make the code more readable, and it would avoid several changes.
>  
>
I didn't want to clobber the name space, but I agree that adding a
variable makes my change more consistent with the rest of tramp.

>I don't know whether it is possible to cut trailing newlines in
>general. Some existing regexps claim "The regexp should match at end
>of buffer."
>
Then we better not change it.

My patch, whit your change suggestions is attached.