[Haskell-cafe] Maintaining laziness
miguelimo38 at yandex.ru
Mon Dec 29 15:59:46 EST 2008
BTW, why on earth should "inits undefined" be "undefined" instead of
":undefined"? I mean, come on, we all know that "inits anything"
starts with !
On 29 Dec 2008, at 20:41, Henning Thielemann wrote:
> In case someone cares - after some battles with functions that are
> less lazy than expected, I have written a tutorial on how to get
> functions lazy and how to test, whether they are actually lazy:
> I found it especially enlightening, that one can avoid a 'force'
> function in a lazy parser by making the possibility of a parser
> failure explicit in its type. I.e. a parser that cannot fail, need
> no 'force'. (I learnt that in polyparse the 'force' function is
> hidden in 'apply':
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