[Haskell-cafe] instance Enum Double considered not entirely great?

[Brandon Allbery]

On Wed, Sep 21, 2011 at 14:31, Casey McCann <cam at uptoisomorphism.net> wrote:

> My thoughts are that the first interpretation is most naturally suited
> to list range syntax, that the second would be better served by a
> slightly different syntax to make the predicate more explicit, and
> that the third bugs the crap out of me because it's really very useful
> but I can't think of a concise and unambiguous syntax for it.
>

Based on what you said, I'm wondering if the first gets basic fromTo syntax,
the third gets fromThenTo syntax, and the second strikes me as a simplified
form of list comprehension and might possibly be phrased as a cross between
range and comprehension.  Although the most "correct" such cross has an
ambiguity with the comma... can we still use | as the delimiter, read as
"such that"?  ([a .. z | filter])

-- 
brandon s allbery                                      allbery.b at gmail.com
wandering unix systems administrator (available)     (412) 475-9364 vm/sms
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.haskell.org/pipermail/haskell-cafe/attachments/20110921/2f2ea42d/attachment.htm>