Re: [Haskell-cafe] stack overflow pain

On 21 September 2011 17:32, Felipe Almeida Lessa wrote:

On Wed, Sep 21, 2011 at 6:04 AM, Ketil Malde wrote:

...

Tim Docker writes:

...

        mapM_ applyAction sas

Maybe you could try a lazy version of mapM?  E.g., I think this would do it:

Another option is to use a version of mapM that accumulates the result on the heap.  Maybe this would do the trick:

mapM' f = go []  where    go acc [] = return (reverse acc)    go acc (a:as) = do {x <- a; go (x:acc) as}

HTH,

-- Felipe.

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I think that's indeed the problem. It reminds me of bug: http://hackage.haskell.org/trac/ghc/ticket/5042 There the fix was also to accumulate results on the heap. Bas