Hi!

> How about this?
>
>   let a' = addToFM_C (+) a x 1 in
>       maybe () (`seq` ()) (lookupFM a' x) `seq` a'
>
> It worked for me.

Thank you. It works for me too, but I don't understand why and how ;-))
Could you explain?

-- 
Alexander Kogan
Institute of Applied Physics
Russian Academy of Sciences
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