What is the idiomatic way to say in (ghc) Haskell: "run this computation for at most x seconds" (e. g. it returns Boolean; imagine a primality test) so I want something :: Int -> a -> Maybe a with the guarantee that the result is Just x with x in whnf, or Nothing. I guess one answer is "that's not Haskell because that's not a function". Sure, but I think I need it anyways, so I would accept some IO .. in the types. Best regards, -- -- Johannes Waldmann -- Tel/Fax (0341) 3076 6479/80 -- ---- http://www.imn.htwk-leipzig.de/~waldmann/ -------
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