Alexey Karakulov <[email protected]> writes:

> (Ord b) must be deduced from (Functor (Set b)) but it doesn't. I don't know
> whether it's my mistake somewhere or ghc problem.

I've come across this problem as well; the best solution I've seen so
far is the one taken by Ganesh in his rmonad library:
http://hackage.haskell.org/package/rmonad

-- 
Ivan Lazar Miljenovic
[email protected]
IvanMiljenovic.wordpress.com
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