dan.doel at gmail.com
Thu Feb 26 09:47:10 EST 2009
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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