GHCI parse bug?

[Hal Daume III]

Yes, the spaces are necessary.  This is because of the maximal munch
rule; it assumes that '->\' is an identifier.  In fact, you can define it
as such:

Prelude> let (->\) a b = a + b
Prelude> 5 ->\ 6
11
Prelude>

You can of course write

Prelude> let f = \x y z -> x (map (+y) z)

if you wish.

--
Hal Daume III

 "Computer science is no more about computers    | hdaume@isi.edu
  than astronomy is about telescopes." -Dijkstra | www.isi.edu/~hdaume

On Wed, 16 Oct 2002, Bryn Keller wrote:

> Prelude> let f = \x->\y->\z->x (map (+ y) z)
> <interactive>:1: parse error on input `->\'
> Prelude> let f = \x-> \y-> \z-> x (map (+ y) z)
> Prelude>
> 
> Are the spaces really necessary, or is this a bug?
> 
> Thanks,
> 
> Bryn
> 
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