isNull{Fun,}Ptr

[Marcin 'Qrczak' Kowalczyk]

Wed, 11 Sep 2002 16:42:55 +1000 (EST), Manuel M T Chakravarty <chak at cse.unsw.edu.au> pisze:

> Sure, but there is also 
> 
>   null = (== [])
> 
> in the Prelude and `Maybe.isNothing'.

Because they work even if list element type or the type argument of Maybe
isn't Eq. There is no analogous need for null pointers (as for numeric 0).

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