[Haskell-cafe] Re: [Haskell] Nested guards?

[Stefan O'Rear]

On Thu, Dec 06, 2007 at 11:40:58PM +0100, Ben Franksen wrote:
> Aaron Denney wrote:
> > On 2007-12-06, Wolfgang Jeltsch <g9ks157k at acme.softbase.org> wrote:
> >> list comprehensions deal with specific operations (map, filter, etc.)
> >> of a specific type ([]).
> > 
> > Ah, so we should bring back monad comprehensions?
> 
> I don't miss monad comprehension much, but I'd like to have a way to use
> comprehension for other sequence types, notably ByteString, array types and
> Data.Sequence (other than converting to lists and back).

If we had monad comprehensions and some kind of restricted monads (see
my post 'Constructor classes considered harmful', but note that I didn't
then and still don't have a tolerable replacement), we'd get bytestring
/ sequence comprehensions for free.

Stefan
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