Invalid coding system: unicode-1-1-utf-7

["Jochen Küpper" <jochen-+It19tn3Rl9sbm7dSapR3bNAH6kLmebB@public.gmane.org>]

In my .gnus I have 
,----
| (add-to-list 'mm-charset-synonym-alist (if (and (not (mm-coding-system-p 'unicode-1-1-utf-7))
|                                                 (mm-coding-system-p 'utf-7))
|                                            '(unicode-1-1-utf-7 . utf-7)))
`----
and that seems to work correctly:
,----[ C-h v mm-charset-synonym-alist RET ]
| mm-charset-synonym-alist's value is 
| ((unicode-1-1-utf-7 . utf-7)
|  (big5-hkscs . big5)
|  (unicode . utf-16-le)
|  (ks_c_5601-1987 . cp949))
| 
| 
| A mapping from invalid charset names to the real charset names.
| 
| Defined in `mm-util'.
| 
| [back]
`----

However, when sending (S o m) messages with the unicode-1-1-utf-7
coding system, Gnus gives the following error (and stops):
,----
| mm-encode-body: Invalid coding system: unicode-1-1-utf-7
`----

No Gnus v0.4
GNU Emacs 22.0.50.22 (i686-pc-linux-gnu, Motif Version 2.2.2) of 2005-07-27

Anything I am doing wrong or overlooking here? 

Greetings,
Jochen
-- 
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        (Part 3 you find in my messages before fall 2003.)