Re: [Haskell-cafe] (no subject)

2011-11-28 Thread Erik Hesselink
On Mon, Nov 28, 2011 at 23:55, Willem O wrote: > And I added this function: > createPoint :: Int -> Point > createPoint x = Point x > When I loaded the file containing all this into ghci and executed 'Vector $ > map createPoint [1..5]' the result was '(1, 2, 3, 4, 5)' (without the > quotes). Note

Re: [Haskell-cafe] containers-deepseq?

2011-11-28 Thread Michael Snoyman
On Tue, Nov 29, 2011 at 7:43 AM, Michael Snoyman wrote: > Hi all, > > Since the release of deepseq 1.2, we've had a bit of a problem: when > using the newest versions of packages on Hackage, there is no NFData > instance available for the containers types. When GHC 7.4 comes out > with its newer v

[Haskell-cafe] containers-deepseq?

2011-11-28 Thread Michael Snoyman
Hi all, Since the release of deepseq 1.2, we've had a bit of a problem: when using the newest versions of packages on Hackage, there is no NFData instance available for the containers types. When GHC 7.4 comes out with its newer version of containers, this will be addressed, but we'll still have p

[Haskell-cafe] Built-in LLVM exception handling

2011-11-28 Thread Gregory Crosswhite
Purely out of curiosity, would it be more efficient for GHC to use the new built-in exception handling instructions in LLVM? http://blog.llvm.org/2011/11/llvm-30-exception-handling-redesign.html Cheers, Greg___ Haskell-Cafe mailing list Haskell

Re: [Haskell-cafe] Haskell Platform 64 bit

2011-11-28 Thread David Pollak
Please try the following: raptor:~ root# rm -rf /Library/Haskell/ raptor:~ root# cd ~dpp/Library/ raptor:Library root# rm -rf Haskell/ raptor:Library root# cd .. raptor:dpp root# rm -rf .cabal/ raptor:dpp root# I think the issue is that the installer was trying to install on top of an existing i

Re: [Haskell-cafe] (no subject)

2011-11-28 Thread Willem O
Yes, thank you. Here's my simple fix: newtype Point = Point Int instance Show Point where show (Point a) = [chr $ a + 48] data Vector = Vector [Point] instance Show Vector where show (Vector ys) = let show' [z] = show z show' (x:xs) = show x ++ ", " ++ show' xs

Re: [Haskell-cafe] (no subject)

2011-11-28 Thread Brent Yorgey
On Mon, Nov 28, 2011 at 04:20:54PM -0600, Antoine Latter wrote: > On Mon, Nov 28, 2011 at 4:12 PM, Willem Obbens wrote: > > Hello, > > I get this error when I try to derive an instance of the Show typeclass: > > Abc.hs:21:60: > >     Couldn't match expected type `Vector' with actual type `[Point]'

Re: [Haskell-cafe] (no subject)

2011-11-28 Thread Antoine Latter
On Mon, Nov 28, 2011 at 4:12 PM, Willem Obbens wrote: > Hello, > I get this error when I try to derive an instance of the Show typeclass: > Abc.hs:21:60: >     Couldn't match expected type `Vector' with actual type `[Point]' >     In the first argument of `show'', namely `xs' >     In the second a

[Haskell-cafe] (no subject)

2011-11-28 Thread Willem Obbens
Hello, I get this error when I try to derive an instance of the Show typeclass: Abc.hs:21:60:Couldn't match expected type `Vector' with actual type `[Point]'In the first argument of `show'', namely `xs'In the second argument of `(++)', namely `show' xs'In the second argument of

Re: [Haskell-cafe] Overloaded Strings as default

2011-11-28 Thread Ivan Lazar Miljenovic
On 29 November 2011 07:28, Daniel Díaz Casanueva wrote: > Hi Cafe, > > I only feel curious about what would be the consequences of becoming the > Overloaded Strings feature (currently, an extension) to be default in > Haskell. This is not a proposal. I just want to know what pros and > cons there

[Haskell-cafe] Overloaded Strings as default

2011-11-28 Thread Daniel Díaz Casanueva
Hi Cafe, I only feel curious about what would be the consequences of becoming the Overloaded Strings feature (currently, an extension) to be default in Haskell. This is not a proposal. I just want to know what pros and cons there are. Thanks! ___ Haskel

Re: [Haskell-cafe] Drawing charts over a lot of data

2011-11-28 Thread Tim Docker
On 22/11/2011, at 10:55 AM, Bryan O'Sullivan wrote: Be aware that Chart is pretty slow on large data sets. I've noticed this too. I believe the issue is with the cairo bindings - hopefully a new version of gtk2hs will fix this: http://www.mail-archive.com/haskell-cafe@haskell.org/msg94451.h

[Haskell-cafe] PADL 2012 Call for Participation

2011-11-28 Thread Claudio Russo
Call for Participation == 14th International Symposium on Practical Aspects of Declarative Languages (PADL 2012) http://research.microsoft.com/~crusso/padl12 Philadelphia, Pennsylvania, USA, January 23-24, 2012

Re: [Haskell-cafe] Haskell Platform 64 bit

2011-11-28 Thread Jean-Marie Gaillourdet
Hi, On 26.11.2011, at 01:29, Philippe Sismondi wrote: > I just tried to install the Haskell Platform 64-bit on OS X Snow Leopard > 10.6.8. The install fails with "an error". This is all I see in > /var/log/install.log: > > 11-11-25 6:22:01 PM Installer[53992]The Installer encountere

Re: [Haskell-cafe] Proposed change to mime-mail

2011-11-28 Thread Michael Snoyman
On Wed, Nov 23, 2011 at 9:39 PM, Erik Hesselink wrote: > Hi all, > > I've found and solved a problem with mime-mail, and Michael Snoyman > asked me to send a request for feedback to -cafe, so here goes. > > In short, the issue is with address headers containing 'special' > (non-ascii) characters.