On Mon, Jul 31, 2006 at 10:59:14AM +0200,
 Matthias Fischmann <[EMAIL PROTECTED]> wrote 
 a message of 89 lines which said:

>        try b <|> (return '-')
...
> The (return 'x') is needed for type consistency. 

OK, it works. Many thanks for the solution and the explanations.
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