reg Fitzgerald
Date: Thu, 29 Oct 2009 10:24:23
To: Simon Peyton-Jones
Cc: GHC users
Subject: Re: Update on GHC 6.12.1
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> Another minor question is whether "-XDoRec" is a good
> name for the flag. We can't really use "-XRecursiveDo"
> because that's the one we are deprecating!
"-XReDo" :)
-Greg
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ht
| Analogously, is
|
| | > do { a <- getChar
| | > ; rec { b <- f c
| | >; c <- g b }
| | > ; putChar c
| | > ; return b }
|
| equivalent to
|
| | > do { a <- getChar
| | > ; rec { b <- f c
| | >; c <- g b } in do
| | > { putChar c
Simon Peyton Jones answered me:
> | > do { a <- getChar
> | > ; rec { b <- f c
> | >; c <- g b }
> | > ; putChar c
> | > ; return b }
>
>
> | This last point notwithstanding,
> | I find the scoping rules very unintuitive!
> | (b and c appear to escape
On Wed, 2009-10-28 at 22:55 +, Simon Peyton-Jones wrote:
> SECOND, we have produced Release Candidate 1 for GHC 6.12.1, and are
> about to produce RC2. However, before releasing 6.12 we'd like to
> compile all of Hackage, in case doing so reveals bugs in GHC's APIs
> (which are not supposed t
g programs :-)
Simon
| -Original Message-
| From: Lennart Augustsson [mailto:lennart.augusts...@gmail.com]
| Sent: 29 October 2009 10:25
| To: Bulat Ziganshin
| Cc: Simon Peyton-Jones; GHC users
| Subject: Re: Update on GHC 6.12.1
|
| Bulat, that would not be in the ghc tradition of breakin
| > do { a <- getChar
| > ; rec { b <- f c
| >; c <- g b }
| > ; putChar c
| > ; return b }
| This last point notwithstanding,
| I find the scoping rules very unintuitive!
| (b and c appear to escape their apparently nested scope.)
well you are happy with
Hello Simon,
Thursday, October 29, 2009, 1:55:00 AM, you wrote:
> Currently 'mdo' is enabled by -XRecursiveDo. So we propose to
> deprecate this flag, with another flag -XDoRec to enable the 'rec'
> keyword.
i think the best way is to support both in 6.12, marking mdo usage as
deprecated, and r
Simon Peyton Jones wrote:
>
> Recursive do-notation.
> ~~
> The change is this. Instead of writing
>
> mdo { a <- getChar
> ; b <- f c
> ; c <- g b
> ; putChar c
> ; return b }
>
> you would write
>
> do { a <- getChar
> ; rec
Folks
This is an update on the status of GHC 6.12.
FIRST, as you probably know, Hackage and the Haskell Platform is
allowing GHC HQ to get out of the libraries business. So the plan is
- We release GHC 6.12 with very few libraries
- Bill Library Author downloads GHC 6.12 and tests his libra
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