Christian.Maeder at dfki.de
Thu Feb 26 10:46:12 EST 2009
Dan Doel wrote:
> On Thursday 26 February 2009 5:36:05 am Christian Maeder wrote:
>> browsing through the sources of Data.List I discovered "select", which
>> is only used for the implementation of partition and not exported.
>> Can someone explain, why the irrefutable pattern "~" is used? Both
>> components are used in both branches.
> To see the difference, go into ghci, and define select without the irrefutable
> pattern. Then run the following:
> foldr (select even) (,) [1..]
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