Bye,
Tassilo

As a side-note: One thing that confused me while testing is that when
stepping through the function using edebug, I could validate it did the
right thing.  But without debugging, I got the "Copying article %d to
group %s" messages in *Messages*, but not the "Deleting article %d"
message.  But the article was deleted.  Edebugging again, I could see
this:

20101130T174123.051> Copying to nnimap+Fastmail:INBOX.training.ham: (12078)...
...
Result: "Deleting article 12078"

Huh?  How can it be that some messages issued with (gnus-message 9
"...") are printed in *Messages* and some are not (in the same function
with no surrounding let-binding of `gnus-verbose')?  I use the default
value 7 for `gnus-verbose', so IMO no message should have been printed
to *Messages* at all.