In search of: [a->b] -> a -> [b]

[Keith Wansbrough]

Derek Elkins wrote:

> Christian Sievers <sievers@math2.nat.tu-bs.de> wrote:
>
> > (and this could be a monad comprehension, if Haskell still had
> > them...)
> 
> I don't think Haskell ever had them (I'd have to check).
> Gofer did.

They were put in for Haskell 1.4, and removed again for Haskell 98
because of the horrendously confusing error messages they caused.

http://www.haskell.org/definition/

--KW 8-)
-- 
Keith Wansbrough <kw217@cl.cam.ac.uk>
http://www.cl.cam.ac.uk/users/kw217/
University of Cambridge Computer Laboratory.