[Haskell-cafe] arr f

Sven Biedermann Sven.Biedermann at biedermann-consulting.de
Fri Jan 27 14:20:07 EST 2006

Dear Haskellers,
since this is my first post, 
    "Hello all"
I have a problem with a function taken from class Arrow.
    arr :: (b -> c) -> a b c
To build my own arrow, i need to distinguish between different kinds of
b or c.
For instance, if b has the form (d,e), i want to construct something
different as when having form (d,e,f).
Could I get a hint how to express my needs, please!
Many thanks in advance
Sven Biedermann
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