[Haskell-cafe] stack overflow pain

[Bas van Dijk]

On 21 September 2011 17:32, Felipe Almeida Lessa <felipe.lessa at gmail.com> wrote:
> On Wed, Sep 21, 2011 at 6:04 AM, Ketil Malde <ketil at malde.org> wrote:
>> Tim Docker <tim at dockerz.net> 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