28 Feb
2005
28 Feb
'05
1:47 p.m.
Andrew Pimlott
On Mon, Feb 28, 2005 at 01:45:25PM +0000, Malcolm Wallace wrote:
As examples of language features that should be removed or revised, how about these:
Perhaps
(d) the restriction of list comprehension to lists (instead of MonadPlus)
You do realise that we used to have monad comprehensions in Haskell 1.4, and they were deliberately removed for Haskell'98? The reason was that error messages for beginners' code were rather baffling. (And pretty baffling for some experts too!) In any case, the do notation is exactly analogous to list comprehensions with the restriction to a single monad lifted. Regards, Malcolm