Re: [GHC] #5007: deriving seems to ignore class context for a type family
#5007: deriving seems to ignore class context for a type family
+---
Reporter: jkff | Owner: simonpj
Type: bug| Status: closed
Priority: high | Milestone: 7.2.1
Component: Compiler (Type checker)|Version: 7.0.2
Resolution: invalid| Keywords: type families,
datatype contexts, type classes, deriving
Testcase: | Blockedby:
Difficulty: | Os: Unknown/Multiple
Blocking: | Architecture: Unknown/Multiple
Failure: GHC rejects valid program |
+---
Changes (by simonpj):
* status: new = closed
* resolution: = invalid
Comment:
The error message is quite right.
Using a context on a data type declaration, as you are doing, is a mis-
feature of Haskell. If you read its specification carefully you'll see
that it is practically useless. Any program using it is suspicious.
Certainly, it has absolutely no effect on 'deriving' declarations.
You can follow the advice in the error message and use a standalone
deriving declaration, thus
{{{
{-# LANGUAGE StandaloneDeriving, FlexibleContexts, UndecidableInstances,
TypeFamilies #-}
module T5007 where
class Foo a where
data Bar a :: *
class (Show (Bar a)) = Qux a
data Xyzzy a = Xyzzy (Bar a)
deriving instance Show (Bar a) = Show (Xyzzy a)
}}}
--
Ticket URL: http://hackage.haskell.org/trac/ghc/ticket/5007#comment:2
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[GHC] #5027: Remove ability to use ghc-binary
#5027: Remove ability to use ghc-binary -+-- Reporter: igloo |Owner: Type: bug | Status: new Priority: high |Milestone: 7.2.1 Component: Compiler | Version: 7.0.2 Keywords:| Testcase: Blockedby:| Difficulty: Os: Unknown/Multiple | Blocking: Architecture: Unknown/Multiple | Failure: None/Unknown -+-- There have been a couple of cases recently where people have been using the `ghc-binary` package. We should either: * ship `binary` instead. Then people can legitimately use it, and as a bonus, as GHC moves to using `binary` the `Binary` instances for GHC's types will become available * Add something to GHC to allow us to ''really'' hide packages, so people can't use it We'll have to make some sort of decision about `hoopl`, too. -- Ticket URL: http://hackage.haskell.org/trac/ghc/ticket/5027 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler ___ Glasgow-haskell-bugs mailing list Glasgow-haskell-bugs@haskell.org http://www.haskell.org/mailman/listinfo/glasgow-haskell-bugs
[GHC] #5028: stage3 build failing with core-lint error
#5028: stage3 build failing with core-lint error
-+--
Reporter: simonmar |Owner:
Type: bug | Status: new
Priority: highest |Milestone: 7.2.1
Component: Compiler | Version: 7.1
Keywords:| Testcase:
Blockedby:| Difficulty:
Os: Unknown/Multiple | Blocking:
Architecture: Unknown/Multiple | Failure: Building GHC failed
-+--
Sometime around 10 March 2011, the nightly build on x86-64/Linux began
failing the stage3 build with the following core-lint error:
{{{
*** Core Lint errors : in result of CorePrep ***
no location info:
[RHS of ds4_s1PqX :: (FastString.FastString,
FastString.FastString)]
Occurrence of a dead Id wild3_s1S4x
*** Offending Program ***
notHappyAtAll_r3z1 :: forall t_a5OH. t_a5OH
[GblId, Str=DmdType b]
notHappyAtAll_r3z1 =
\ (@ t_a5OH) -
case GHC.Base.unpackCString# Internal Happy error
of sat_s1Q0Y { __DEFAULT -
GHC.Err.error @ t_a5OH sat_s1Q0Y
}
etc.
}}}
while building `compiler/stage3/build/Parser.hs`.
--
Ticket URL: http://hackage.haskell.org/trac/ghc/ticket/5028
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Re: [GHC] #5028: stage3 build failing with core-lint error
#5028: stage3 build failing with core-lint error -+-- Reporter: simonmar |Owner: Type: bug | Status: new Priority: highest |Milestone: 7.2.1 Component: Compiler | Version: 7.1 Keywords:| Testcase: Blockedby:| Difficulty: Os: Unknown/Multiple | Blocking: Architecture: Unknown/Multiple | Failure: Building GHC failed -+-- Changes (by simonpj): * cc: batterseapower (added) Comment: Max, might you look at this, since it's your patch that's implicated? Simon -- Ticket URL: http://hackage.haskell.org/trac/ghc/ticket/5028#comment:2 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler ___ Glasgow-haskell-bugs mailing list Glasgow-haskell-bugs@haskell.org http://www.haskell.org/mailman/listinfo/glasgow-haskell-bugs
Re: [GHC] #5017: Stage 1 core lint error: compiler/utils/Util.lhs
#5017: Stage 1 core lint error: compiler/utils/Util.lhs --+- Reporter: altaic | Owner: Type: bug | Status: closed Priority: normal | Milestone: Component: Compiler |Version: 7.1 Resolution: duplicate| Keywords: Testcase: | Blockedby: Difficulty: | Os: MacOS X Blocking: | Architecture: x86_64 (amd64) Failure: Building GHC failed | --+- Changes (by simonpj): * status: new = closed * resolution: = duplicate Comment: Appears to be a dup of #5028 (which was reported later, but may be easier to reproduce). -- Ticket URL: http://hackage.haskell.org/trac/ghc/ticket/5017#comment:1 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler ___ Glasgow-haskell-bugs mailing list Glasgow-haskell-bugs@haskell.org http://www.haskell.org/mailman/listinfo/glasgow-haskell-bugs
Re: [GHC] #5023: program exits at runtime with 'unimplemented/strange closure type' error
#5023: program exits at runtime with 'unimplemented/strange closure type' error ---+ Reporter: bfbarakat |Owner: Type: bug | Status: infoneeded Priority: normal |Milestone: Component: Compiler| Version: 6.12.3 Keywords: | Testcase: Blockedby: | Difficulty: Os: MacOS X | Blocking: Architecture: x86_64 (amd64) | Failure: None/Unknown ---+ Changes (by simonmar): * status: new = infoneeded Comment: Could you send us the data files too? Basically we need everything required to reproduce the problem here. -- Ticket URL: http://hackage.haskell.org/trac/ghc/ticket/5023#comment:1 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler ___ Glasgow-haskell-bugs mailing list Glasgow-haskell-bugs@haskell.org http://www.haskell.org/mailman/listinfo/glasgow-haskell-bugs
Re: [GHC] #5025: GHC should support -x objective-c
#5025: GHC should support -x objective-c -+-- Reporter: guest |Owner: Type: feature request | Status: new Priority: high |Milestone: 7.2.1 Component: Compiler | Version: 7.0.2 Keywords: objective-c | Testcase: Blockedby:| Difficulty: Easy (less than 1 hour) Os: MacOS X | Blocking: Architecture: Unknown/Multiple | Failure: None/Unknown -+-- Changes (by simonmar): * priority: normal = high * difficulty: = Easy (less than 1 hour) * milestone: = 7.2.1 -- Ticket URL: http://hackage.haskell.org/trac/ghc/ticket/5025#comment:1 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler ___ Glasgow-haskell-bugs mailing list Glasgow-haskell-bugs@haskell.org http://www.haskell.org/mailman/listinfo/glasgow-haskell-bugs
Re: [GHC] #5028: stage3 build failing with core-lint error
#5028: stage3 build failing with core-lint error -+-- Reporter: simonmar |Owner: Type: bug | Status: new Priority: highest |Milestone: 7.2.1 Component: Compiler | Version: 7.1 Keywords:| Testcase: Blockedby:| Difficulty: Os: Unknown/Multiple | Blocking: Architecture: Unknown/Multiple | Failure: Building GHC failed -+-- Changes (by altaic): * cc: william.knop.nospam@… (added) Comment: I confirmed that the core lint error from #5017 disappears after unpulling the aforementioned patch. -- Ticket URL: http://hackage.haskell.org/trac/ghc/ticket/5028#comment:4 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler ___ Glasgow-haskell-bugs mailing list Glasgow-haskell-bugs@haskell.org http://www.haskell.org/mailman/listinfo/glasgow-haskell-bugs
Re: [GHC] #5028: stage3 build failing with core-lint error
#5028: stage3 build failing with core-lint error
-+--
Reporter: simonmar |Owner:
Type: bug | Status: new
Priority: highest |Milestone: 7.2.1
Component: Compiler | Version: 7.1
Keywords:| Testcase:
Blockedby:| Difficulty:
Os: Unknown/Multiple | Blocking:
Architecture: Unknown/Multiple | Failure: Building GHC failed
-+--
Comment(by batterseapower):
It looks like this is because OccAnal implements binder-swapping. So if
you have this in the input:
{{{
case x of y { p - e[x] }
}}}
Then you get this in the output:
{{{
case x of y { p - let x = y in e }
}}}
This makes y live, and if it was dead to begin with this causes a lint
error. I had absolutely no idea OccAnal was playing games like this!
My first thought was that perhaps OccAnal should be setting the OccInfo on
the y in it's manufactured binding to e.g. NoOccInfo. This would
certainly make the error go away, but it is not in the spirit of OccAnal -
as far as I can tell, OccAnal guarantees that *binders* will have the
right OccInfo, but relies on the simplifier to ensure that the
*occurrences* are up-to-date.
The obvious thing to do is paramaterise OccAnal so we can prevent it from
implementing binder-swap when we use it just before CorePrep. I'm working
on a patch to that effect.
--
Ticket URL: http://hackage.haskell.org/trac/ghc/ticket/5028#comment:5
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Re: [GHC] #5028: stage3 build failing with core-lint error
#5028: stage3 build failing with core-lint error -+-- Reporter: simonmar |Owner: Type: bug | Status: new Priority: highest |Milestone: 7.2.1 Component: Compiler | Version: 7.1 Keywords:| Testcase: Blockedby:| Difficulty: Os: Unknown/Multiple | Blocking: Architecture: Unknown/Multiple | Failure: Building GHC failed -+-- Comment(by batterseapower): (Unvalidated) patch attached. A stage 3 build goes through OK with this -dcore-lint with this patch applied. Does this look good to you, Simon? Or do you think there is a better approach? -- Ticket URL: http://hackage.haskell.org/trac/ghc/ticket/5028#comment:6 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler ___ Glasgow-haskell-bugs mailing list Glasgow-haskell-bugs@haskell.org http://www.haskell.org/mailman/listinfo/glasgow-haskell-bugs
Re: Data.ByteString.Lazy.ByteString vs Data.ByteString.Lazy.Internal.ByteString
Am 14.03.2011 06:26, schrieb C K Kashyap: Looks like a job for Data.Binary. I'd like to use it with just the libraries that are part of the platform I forgot to mention, Data.Binary does not seem to be in the platform. Right, it is not in the platform, but I would recommend to install those packages that you find useful (and vote for packages to be included into later versions of the platform.) Interestingly, there is a hidden package ghc-binary-0.5.0.2, which almost looks like binary-0.5.0.2. Maybe ghc developers and platform maintainers could comment on any differences. If there are none you could simple ghc-pkg expose ghc-binary. For future versions of ghc and the platform a single ghc-binary or binary version would be better. Cheers Christian ___ Glasgow-haskell-users mailing list Glasgow-haskell-users@haskell.org http://www.haskell.org/mailman/listinfo/glasgow-haskell-users
Re: [Haskell-cafe] Data.ByteString.Lazy.ByteString vs Data.ByteString.Lazy.Internal.ByteString
The ghc-binary package is used internal to GHC, and isn't gauranteed to be present from one version to the next, nor do I expect the GHC team to promise it will have a stable interface. You'd really be better of instaling the package binary, or something similar. On Mar 14, 2011 5:34 AM, Christian Maeder christian.mae...@dfki.de wrote: ___ Glasgow-haskell-users mailing list Glasgow-haskell-users@haskell.org http://www.haskell.org/mailman/listinfo/glasgow-haskell-users
testsuite missing was: Re: ANNOUNCE: GHC version 7.0.2
Why is the file still not being updated? http://www.haskell.org/ghc/dist/7.0.2/testsuite-7.0.2.tar.bz2 C. Am 10.03.2011 03:22, schrieb Jens Petersen: On 4 March 2011 23:14, Christian Maeder christian.mae...@dfki.de wrote: http://www.haskell.org/ghc/dist/7.0.2/testsuite-7.0.2.tar.bz2 This archive does not seem to have the actual tests inside the testsuite subdirectory. At least the README is identical to the top-level one. Not just the readme, but most of the files actually! $ tar jxf ghc-7.0.2-src.tar.bz $ tar jxf testsuite-7.0.2.tar.bz $ mv ghc-7.0.2/testsuite testsuite-7.0.2 $ diff -sr ghc-7.0.2 testsuite-7.0.2 | grep are identical$ | wc -l 1193 A week has passed now - can we please have a fixed testsuite-7.0.2.tar.bz2? :) Thanks, Jens ___ Glasgow-haskell-users mailing list Glasgow-haskell-users@haskell.org http://www.haskell.org/mailman/listinfo/glasgow-haskell-users
Re: Data.ByteString.Lazy.ByteString vs Data.ByteString.Lazy.Internal.ByteString
On 14/03/2011 10:33, Christian Maeder wrote: Am 14.03.2011 06:26, schrieb C K Kashyap: Looks like a job for Data.Binary. I'd like to use it with just the libraries that are part of the platform I forgot to mention, Data.Binary does not seem to be in the platform. Right, it is not in the platform, but I would recommend to install those packages that you find useful (and vote for packages to be included into later versions of the platform.) Interestingly, there is a hidden package ghc-binary-0.5.0.2, which almost looks like binary-0.5.0.2. Maybe ghc developers and platform maintainers could comment on any differences. If there are none you could simple ghc-pkg expose ghc-binary. For future versions of ghc and the platform a single ghc-binary or binary version would be better. You shouldn't use ghc-binary. It is indeed the same as binary, and is required because GHC uses it internally, but binary is not a platform package so we renamed it to ghc-binary and set it to be hidden by default. Cheers, Simon ___ Glasgow-haskell-users mailing list Glasgow-haskell-users@haskell.org http://www.haskell.org/mailman/listinfo/glasgow-haskell-users
Re: GHC build error: cannot satisfy -package ghc-7.1.20110217
On 10/03/2011 02:44, Dave Bayer wrote: I saw this same error, building GHC 7.0.2 from source on OS X. My builds are completely scripted, so I could attempt any experiments that would help. I always expect issues with major (here, 6 = 7) version changes; here all issues surrounded cabal-install in one way or another. My issues went away when I compiled GHC 7.0.2 using a bootstrap copy of GHC 7.0.2 (rather than from GHC 6.12.3). made the new install the active GHC, and then ran ./bootstrap.sh --global to install cabal-install-0.10.2. Either the change from cabal-install-0.10.0 helped (I couldn't track down release notes) or there is a subtle difference in a GHC 7.0.2 compiled from GHC 6.12.3, that gets exposed when one tries to install cabal-install. Can you tell us exactly which versions of GHC and Cabal you were using when the build failed? We should be able to reproduce the problem from that. Cheers, Simon I still can't use cabal-install on one copy of 7.0.2 to install to another copy of 7.0.2, but it looks like something I'll manage to sort out without help. I use PREFIX to localize the installation to e.g. /usr/local/ghc-7.0.2c. This requires that my script edits bootstrap.sh, as there's no way to change PREFIX from outside in --global mode. On Mar 8, 2011, at 9:44 AM, Simon Marlow wrote: I don't know what might case this I'm afraid. Is it reproducible from a completely clean tree? (i.e. make maintainer-clean first). Cheers, Simon ___ Glasgow-haskell-users mailing list Glasgow-haskell-users@haskell.org http://www.haskell.org/mailman/listinfo/glasgow-haskell-users
Linker error
Hi All. I've just installed the new Haskell platform (2011.2.0.0) on my MacOS X 10.6.6 with Xcode 4 Now the problem is that when I try to build my Haskel programs I receive the linker error: Linking lexer ... ld: library not found for -lcrt1.10.5.o collect2: ld returned 1 exit status Any idea? Thanks in advance. Luca ___ Glasgow-haskell-users mailing list Glasgow-haskell-users@haskell.org http://www.haskell.org/mailman/listinfo/glasgow-haskell-users
Re: Linker error
There's an open bug ticket about XCode 4 not linking properly (I think due to the new dtrace support making GHC builds tied to a specific XCode version). Can you downgrade to XCode 3 in the meantime? On Mon, Mar 14, 2011 at 8:43 AM, Luca Ciciriello luca_cicirie...@hotmail.com wrote: Hi All. I've just installed the new Haskell platform (2011.2.0.0) on my MacOS X 10.6.6 with Xcode 4 Now the problem is that when I try to build my Haskel programs I receive the linker error: Linking lexer ... ld: library not found for -lcrt1.10.5.o collect2: ld returned 1 exit status Any idea? Thanks in advance. Luca ___ Glasgow-haskell-users mailing list Glasgow-haskell-users@haskell.org http://www.haskell.org/mailman/listinfo/glasgow-haskell-users ___ Glasgow-haskell-users mailing list Glasgow-haskell-users@haskell.org http://www.haskell.org/mailman/listinfo/glasgow-haskell-users
Re: Linker error
The relevant GHC ticket is: http://hackage.haskell.org/trac/ghc/ticket/5011, which it seems has already been fixed in HEAD. You can also check this thread on Haskell-Cafe which contains a few workarounds for this problem: http://www.haskell.org/pipermail/haskell-cafe/2011-March/090051.html -Dave On Mar 14, 2011, at 10:55 AM, Don Stewart wrote: There's an open bug ticket about XCode 4 not linking properly (I think due to the new dtrace support making GHC builds tied to a specific XCode version). Can you downgrade to XCode 3 in the meantime? On Mon, Mar 14, 2011 at 8:43 AM, Luca Ciciriello luca_cicirie...@hotmail.com wrote: Hi All. I've just installed the new Haskell platform (2011.2.0.0) on my MacOS X 10.6.6 with Xcode 4 Now the problem is that when I try to build my Haskel programs I receive the linker error: Linking lexer ... ld: library not found for -lcrt1.10.5.o collect2: ld returned 1 exit status Any idea? Thanks in advance. Luca ___ Glasgow-haskell-users mailing list Glasgow-haskell-users@haskell.org http://www.haskell.org/mailman/listinfo/glasgow-haskell-users ___ Glasgow-haskell-users mailing list Glasgow-haskell-users@haskell.org http://www.haskell.org/mailman/listinfo/glasgow-haskell-users ___ Glasgow-haskell-users mailing list Glasgow-haskell-users@haskell.org http://www.haskell.org/mailman/listinfo/glasgow-haskell-users
Re: hoogling GHC
Hi Neil -- Is there a command line option that allows one to change the default prefix for the URL returned by searches? For example, I managed to get a local hoogle server to index over ghc.foo but a query dfun returned the (dead) link http://hackage.haskell.org/packages/archive/ghc/latest/doc/html/Id.html#v:isDFunId presumably using the default prefix for hackage.haskell.org/... Instead, by manually tweaking the prefix to http://www.haskell.org/ghc/docs/7.0.1/html/libraries/ghc-7.0.1/Id.html#v:isDFunId I get something useful. Is there some way to rig the .txt -- .foo conversion to use a manually supplied prefix? Thanks for your help with this! Ranjit. On Mar 9, 2011, at 1:59 PM, Neil Mitchell wrote: Hi Ranjit, It sounds like you've got quite far. Sadly the manual is a bit out of date with respect to generating databases, but generally you need to produce ghc.txt on your own (using tools such as GHC's make system), then you can do: hoogle convert ghc.txt default.hoo Then you can run the local server with: hoogle server --databases=. That will find databases from the current directory, and serve them. Alternatively, if you put ghc.hoo (or default.hoo) in $DATADIR/databases it will pick them up automatically (where $DATADIR is whatever Cabal configured it to be). If you name the database as default.hoo it will be searched by default, if you name it ghc.hoo then foo +ghc will search for foo in the GHC database. If a copy of ghc.txt was publicly available somewhere (and updated on some schedule), I'd be happy to make the official Hoogle server search it. Usually I just grab databases off Hackage, but I'll happily make an exception for GHC. Thanks, Neil On Sun, Mar 6, 2011 at 7:52 AM, Malcolm Wallace malcolm.wall...@me.com wrote: The final stumbling block is getting the local webserver (hoogle server) to also search the above database. I'm sure there must be some simple way I can pass the name of the database as an argument when I boot up the server, but I can't seem to find it... Have you found the various versions of the web deployment procedure yet? deploy.txt: instructions to follow manually (seems to be up-to-date) deploy.sh: a shell script version to run locally (may be old) Deploy.hs: a haskell version to run remotely (may also be old) Obviously those scripts are tailored to the official installation, but there are some clues in there, for instance the steps cabal configure --datadir=/srv/web/haskell.org/hoogle/ --datasubdir=datadir -O2 and Upload datadir/resources to /srv/web/haskell.org/hoogle/datadir/resources Upload datadir/databases/* to /srv/web/haskell.org/hoogle/datadir/databases Regards, Malcolm ___ Glasgow-haskell-users mailing list Glasgow-haskell-users@haskell.org http://www.haskell.org/mailman/listinfo/glasgow-haskell-users ___ Glasgow-haskell-users mailing list Glasgow-haskell-users@haskell.org http://www.haskell.org/mailman/listinfo/glasgow-haskell-users
Re: hoogling GHC
Hi Ranjit, Is there a command line option that allows one to change the default prefix for the URL returned by searches? No command line option, but you can change the .txt file itself by doing: @url http://www.haskell.org/ghc/docs/7.0.1/html/libraries/ghc-7.0.1/ @package ghc That should cause all the URL's in the GHC package that aren't explicit to have the above URL prepended to them. If there's demand, I can add a flag. Thanks, Neil On Mar 9, 2011, at 1:59 PM, Neil Mitchell wrote: Hi Ranjit, It sounds like you've got quite far. Sadly the manual is a bit out of date with respect to generating databases, but generally you need to produce ghc.txt on your own (using tools such as GHC's make system), then you can do: hoogle convert ghc.txt default.hoo Then you can run the local server with: hoogle server --databases=. That will find databases from the current directory, and serve them. Alternatively, if you put ghc.hoo (or default.hoo) in $DATADIR/databases it will pick them up automatically (where $DATADIR is whatever Cabal configured it to be). If you name the database as default.hoo it will be searched by default, if you name it ghc.hoo then foo +ghc will search for foo in the GHC database. If a copy of ghc.txt was publicly available somewhere (and updated on some schedule), I'd be happy to make the official Hoogle server search it. Usually I just grab databases off Hackage, but I'll happily make an exception for GHC. Thanks, Neil On Sun, Mar 6, 2011 at 7:52 AM, Malcolm Wallace malcolm.wall...@me.com wrote: The final stumbling block is getting the local webserver (hoogle server) to also search the above database. I'm sure there must be some simple way I can pass the name of the database as an argument when I boot up the server, but I can't seem to find it... Have you found the various versions of the web deployment procedure yet? deploy.txt: instructions to follow manually (seems to be up-to-date) deploy.sh: a shell script version to run locally (may be old) Deploy.hs: a haskell version to run remotely (may also be old) Obviously those scripts are tailored to the official installation, but there are some clues in there, for instance the steps cabal configure --datadir=/srv/web/haskell.org/hoogle/ --datasubdir=datadir -O2 and Upload datadir/resources to /srv/web/haskell.org/hoogle/datadir/resources Upload datadir/databases/* to /srv/web/haskell.org/hoogle/datadir/databases Regards, Malcolm ___ Glasgow-haskell-users mailing list Glasgow-haskell-users@haskell.org http://www.haskell.org/mailman/listinfo/glasgow-haskell-users ___ Glasgow-haskell-users mailing list Glasgow-haskell-users@haskell.org http://www.haskell.org/mailman/listinfo/glasgow-haskell-users
[Haskell] ICFP 2011 Deadline Extension
= ICFP 2011: International Conference on Functional Programming http://www.icfpconference.org/icfp2011 = On behalf of the Program Committee of ICFP 2011, I would like to announce a deadline extension for authors affected by the recent earthquake in Japan. The Program Committee will accept titles and abstracts until Monday 4 April at 23:59, and full submissions until Thursday 7 April at 23:59 from those authors affected by the earthquake. Our thoughts go out to the victims of this tragedy. Wouter Swierstra ICFP Publicity Chair ___ Haskell mailing list Haskell@haskell.org http://www.haskell.org/mailman/listinfo/haskell
[arch-haskell] AUR Out-of-date Notification for haskell-alsa-core
Your package haskell-alsa-core has been flagged out of date by cgirard [1]. You may view your package at: http://aur.archlinux.org/packages.php?ID=41100 [1] - http://aur.archlinux.org/account.php?Action=AccountInfoID=16599 ___ arch-haskell mailing list arch-hask...@haskell.org http://www.haskell.org/mailman/listinfo/arch-haskell
[arch-haskell] AUR Comment for haskell-alsa-core
from http://aur.archlinux.org/packages.php?ID=41100 cgirard wrote: This package need to be updated following the ghc update. --- If you no longer wish to receive notifications about this package, please go the the above package page and click the UnNotify button. ___ arch-haskell mailing list arch-hask...@haskell.org http://www.haskell.org/mailman/listinfo/arch-haskell
[Haskell] LOPSTR 2011 - Last CFP
News: - Invited speakers: * John Gallagher (Roskilde University, Denmark) * Fritz Henglein (University of Copenhagen, Denmark) * Vitaly Lagoon (Cadence Design Systems, Boston, USA) - Springer accepted to publish the post-proceedings in the Lecture Notes in Computer Science series. - Submission deadlines approaching: * Paper submission: March 27, 2011 * Extended abstract submission: April 3, 2011 Call for papers 21th International Symposium on Logic-Based Program Synthesis and Transformation LOPSTR 2011 http://users.dsic.upv.es/~lopstr11/ Odense, Denmark, July 18-20, 2011 (co-located with PPDP 2011, AAIP 2011 and WFLP 2011) Objectives: The aim of the LOPSTR series is to stimulate and promote international research and collaboration on logic-based program development. LOPSTR is open to contributions in logic-based program development in any language paradigm. LOPSTR has a reputation for being a lively, friendly forum for presenting and discussing work in progress. Formal proceedings are produced only after the symposium so that authors can incorporate this feedback in the published papers. The 21st International Symposium on Logic-based Program Synthesis and Transformation (LOPSTR 2011) will be held in Odense, Denmark; previous symposia were held in Hagenberg, Coimbra, Valencia, Lyngby, Venice, London, Verona, Uppsala, Madrid, Paphos, London, Venice, Manchester, Leuven, Stockholm, Arnhem, Pisa, Louvain-la-Neuve, and Manchester (you might have a look at the contents of past LOPSTR symposia). LOPSTR 2011 will be co-located with PPDP 2011 (International ACM SIGPLAN Symposium on Principles and Practice of Declarative Programming). Topics: Topics of interest cover all aspects of logic-based program development, all stages of the software life cycle, and issues of both programming- in-the-small and programming-in-the-large. Papers describing applications in these areas are especially welcome. Contributions are welcome on all aspects of logic-based program development, including, but not limited to: - specification - synthesis - verification - transformation - analysis - optimisation - specialization - partial evaluation - inversion - composition - program/model manipulation - certification - security - transformational techniques in SE - applications and tools Survey papers, that present some aspect of the above topics from a new perspective, and application papers, that describe experience with industrial applications, are also welcome. Papers must describe original work, be written and presented in English, and must not substantially overlap with papers that have been published or that are simultaneously submitted to a journal or a conference with refereed proceedings. Work that already appeared in unpublished or informally published workshops proceedings may be submitted. Following past editions, the formal post-conference proceedings will be published by Springer in the Lecture Notes in Computer Science (LNCS) series. IMPORTANT DATES AND SUBMISSION GUIDELINES: - Paper submission: March 27, 2011 - Extended abstract submission: April 3, 2011 - Notification (for pre-proceedings): May 16, 2011 - Camera-ready (for pre-proceedings): June 12, 2011 - Symposium: July 18-20, 2011 Submissions can either be (short) extended abstracts or (full) papers whose length should not exceed 9 and 15 pages (including references), respectively. Submissions must be formatted in the Lecture Notes in Computer Science style (excluding well-marked appendices not intended for publication). Referees are not required to read the appendices, and thus papers should be intelligible without them. Short papers may describe work-in-progress or tool demonstrations. Both short and full papers can be accepted for presentation at the symposium and will then appear in the LOPSTR 2011 pre-proceedings. Full papers can also be immediately accepted for publication in the formal proceedings to be published by Springer in the LNCS series. In addition, after the symposium, the programme committee will select further short or full papers presented in LOPSTR 2011 to be considered for formal publication. These authors will be invited to revise and/or extend their submissions in the light of the feedback solicited at the symposium. Then after another round of reviewing, these revised papers can also be published in the formal proceedings. Invited speakers: - John Gallagher, Roskilde University, Denmark - Fritz Henglein, University of Copenhagen, Denmark (shared with PPDP) - Vitaly Lagoon, Cadence Design Systems, Boston, USA (shared with PPDP) Program Committee: Elvira Albert (Complutense University of Madrid, Spain) Malgorzata Biernacka (University of Wroclaw , Poland) Manuel Carro (Technical University of
Re: [arch-haskell] Transitive version bump/update of dependents?
Hi Leif, Is there a tool for bumping the version numbers / checking for newer versions of all the packages that transitively depend on those that would need to be rebuilt? my repository https://github.com/peti/arch-haskell contains the program scripts/reverse-dependencies.hs, which can list all users of a given package. I use it to determine which packages need their $pkgrel bumped after an update. Or do we even need to worry about that right now [...]? Yes, I think we do. The package 'haskell-utility-ht' has already been re-built with GHC 7.0.2, and it has been uploaded to the binary repository. If that package is updated, its users need their $pkgrel bumped. Take care, Peter ___ arch-haskell mailing list arch-hask...@haskell.org http://www.haskell.org/mailman/listinfo/arch-haskell
Re: [Haskell] Haskell mail server fail?
On 09/03/2011 14:40, Kenneth Hoste wrote: Since last week, I'm not receiving any mails from the Haskell mailing lists (haskell@, haskell-cafe@ and beginners@) at work. (I'm temporarily using my GMail account now) I checked with the guys in our IT department what's going on, and it seems like the Haskell mail server lambda.haskell.org is not (re)configured as it should. The relevant log message on our side is: reject: RCPT from lambda.haskell.org[78.46.100.180]: 504 5.5.2lambda: Helo command rejected: need fully-qualified hostname; from=haskell-boun...@haskell.org to=kenneth.ho...@ugent.be proto=ESMTP helo=lambda Apparently lambda should be responding with helo=lambda.haskell.org (or somesuch) in order to make the mails pass through on our end. We have a pretty strict anti-SPAM policy, and I was told that not using a fully qualified hostname as helo response is a common characteristic of spam servers. Can someone look into this? Ian Lynagh has just fixed this on the server. Please let us know at listname-ow...@haskell.org (e.g. haskell-ow...@haskell.org) if you encounter any further problems. Cheers, Simon ___ Haskell mailing list Haskell@haskell.org http://www.haskell.org/mailman/listinfo/haskell
[Haskell] ANN: craftwerk-0.1, craftwerk-cairo-0.1, craftwerk-gtk-0.1
Dear all, I just released the first version of the Craftwerk graphics library for 2d vector graphics. Craftwerk is intended to act as an abstract interface to different backend drivers. The library itself has a TikZ (http://sourceforge.net/projects/pgf) driver builtin to output vector graphics for use in LaTeX documents. The craftwerk-cairo library supplies a Cairo output function to the library. The aim is to support these two backends in a seamless manner such that graphics created with either backend are not or nearly not distinguishable. The third package (craftwerk-gtk) contains convenience functions to display graphics created with craftwerk directly in a Gtk window, including the basic zooming, PDF TikZ export via a file chooser dialog. It also allows to create a simple user interface that passes options to the rendering function. The feature support is rather rudimentary at the moment, but for current Cairo users most features should be already available from within the craftwerk API. The aim is to support more high level functions like TikZ offers. The project started when I realized that I need to prepare a lot of visualizations at university twice, once for display and once for print. I hope that this library proves to be useful for people with similar tasks. A great thing would be if the Chart library allows to plug another backend in. I haven't really looked into that, but this would allow me to leave Gnuplot and R behind for most purposes and at the same time get higher quality output that is better integrable. I started learning Haskell only half a year ago and this is my first real project. So far I have to say that I enjoy it very much. Therefore, if you find some weird constructions or have any comments about the design of the library, I'm looking forward for any feedback! The source repository can be found under: https://github.com/mahrz/Craftwerk and packages here: http://hackage.haskell.org/package/craftwerk-0.1 http://hackage.haskell.org/package/craftwerk-cairo-0.1 http://hackage.haskell.org/package/craftwerk-gtk-0.1 Best, Malte -- Malte Harder malte.har...@gmail.com ___ Haskell mailing list Haskell@haskell.org http://www.haskell.org/mailman/listinfo/haskell
Re: [Haskell] ANN: craftwerk-0.1, craftwerk-cairo-0.1, craftwerk-gtk-0.1
2011/3/14 Malte Harder malte.har...@googlemail.com: Dear all, I just released the first version of the Craftwerk graphics library for 2d vector graphics. Craftwerk is intended to act as an abstract interface to different backend drivers. The library itself has a TikZ (http://sourceforge.net/projects/pgf) driver builtin to output vector graphics for use in LaTeX documents. The craftwerk-cairo library supplies a Cairo output function to the library. The aim is to support these two backends in a seamless manner such that graphics created with either backend are not or nearly not distinguishable. The third package (craftwerk-gtk) contains convenience functions to display graphics created with craftwerk directly in a Gtk window, including the basic zooming, PDF TikZ export via a file chooser dialog. It also allows to create a simple user interface that passes options to the rendering function. The feature support is rather rudimentary at the moment, but for current Cairo users most features should be already available from within the craftwerk API. The aim is to support more high level functions like TikZ offers. The project started when I realized that I need to prepare a lot of visualizations at university twice, once for display and once for print. I hope that this library proves to be useful for people with similar tasks. A great thing would be if the Chart library allows to plug another backend in. I haven't really looked into that, but this would allow me to leave Gnuplot and R behind for most purposes and at the same time get higher quality output that is better integrable. I started learning Haskell only half a year ago and this is my first real project. So far I have to say that I enjoy it very much. Therefore, if you find some weird constructions or have any comments about the design of the library, I'm looking forward for any feedback! The source repository can be found under: https://github.com/mahrz/Craftwerk and packages here: http://hackage.haskell.org/package/craftwerk-0.1 http://hackage.haskell.org/package/craftwerk-cairo-0.1 http://hackage.haskell.org/package/craftwerk-gtk-0.1 Hi Malte, Your project sounds very good (I will unfortunately not have time to look at it carefully before some time). I guess you know about reddit, anyway there is a thread about your library there: http://www.reddit.com/r/haskell/comments/g3xp1/craftwerk_a_highlevel_and_easy_to_use_graphics/ Could you please as suggest one comment include some screenshots (even better with some code next to them) on the homepage? Thanks for making the code available on both github and hackage! Thu ___ Haskell mailing list Haskell@haskell.org http://www.haskell.org/mailman/listinfo/haskell
Re: [Haskell-cafe] writing to a fifo when the reader stops reading
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 On 3/13/11 03:16 , bri...@aracnet.com wrote: ghc: fdWriteBuf: resource vanished (Broken pipe) which make sense, sort of. I write a value, let's say 10, and the reader reads it. It's the last value so it closes the fifo. Now there's nothing reading, so when I get to threadWaitWrite, I would expect the program to wait, just as it does when it starts up and there is no reader. FIFOs don't work that way; like a regular pipe, once all readers go away it doesn't work any more. You need to open it read-write initially to keep a reader around. Haskell has no control over this: it's how they're defined to work. In general, trying to use a FIFO like an AF_UNIX socket is a mistake. - -- brandon s. allbery [linux,solaris,freebsd,perl]allber...@gmail.com system administrator [openafs,heimdal,too many hats]kf8nh -BEGIN PGP SIGNATURE- Version: GnuPG v1.4.11 (Darwin) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iEYEARECAAYFAk19tqkACgkQIn7hlCsL25VxGwCgsInAy4YJhOA2Ca/tQTRd0Cjs NmAAn2hjqtQm0/eZXVoLM8GMCMv+yxR4 =SDd8 -END PGP SIGNATURE- ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] [Haskell] Linker flags for foreign export.
On 13 March 2011 22:02, Jason Dusek jason.du...@gmail.com wrote: Is there any case in which the empty string would be unsafe? AFAIK this stuff is only used to setup the +RTS options and some of the stuff in System.Environment. I think that the contents of the program name will only cause problems if some code that uses getProgName chokes on the empty string. Cheers, Max ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Data.ByteString.Lazy.ByteString vs Data.ByteString.Lazy.Internal.ByteString
Am 14.03.2011 06:26, schrieb C K Kashyap: Looks like a job for Data.Binary. I'd like to use it with just the libraries that are part of the platform I forgot to mention, Data.Binary does not seem to be in the platform. Right, it is not in the platform, but I would recommend to install those packages that you find useful (and vote for packages to be included into later versions of the platform.) Interestingly, there is a hidden package ghc-binary-0.5.0.2, which almost looks like binary-0.5.0.2. Maybe ghc developers and platform maintainers could comment on any differences. If there are none you could simple ghc-pkg expose ghc-binary. For future versions of ghc and the platform a single ghc-binary or binary version would be better. Cheers Christian ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
[Haskell-cafe] ICFP 2011 Deadline Extension
= ICFP 2011: International Conference on Functional Programming http://www.icfpconference.org/icfp2011 = On behalf of the Program Committee of ICFP 2011, I would like to announce a deadline extension for authors affected by the recent earthquake in Japan. The Program Committee will accept titles and abstracts until Monday 4 April at 23:59, and full submissions until Thursday 7 April at 23:59 from those authors affected by the earthquake. Our thoughts go out to the victims of this tragedy. Wouter Swierstra ICFP Publicity Chair ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] ANN: unordered-containers - a new, faster hashing-based containers library
On 22 Feb 2011, at 22:21, Bryan O'Sullivan wrote: for some code that's (b) faster than anything else currently available I look forward to seeing some benchmarks against libraries other than containers, such as AVL trees, bytestring-trie, hamtmap, list-trie, etc. Good comparisons of different API-usage patterns are hard to come by. Regards, Malcolm ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Data.ByteString.Lazy.ByteString vs Data.ByteString.Lazy.Internal.ByteString
The ghc-binary package is used internal to GHC, and isn't gauranteed to be present from one version to the next, nor do I expect the GHC team to promise it will have a stable interface. You'd really be better of instaling the package binary, or something similar. On Mar 14, 2011 5:34 AM, Christian Maeder christian.mae...@dfki.de wrote: ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Some quick experiments with GHC 7.0.2 in Intel's Manycore Testing Lab (32 cores)
Hi José, On 11/03/2011 14:16, José Pedro Magalhães wrote: I've played a bit with Intel's Manycore Testing Lab (http://software.intel.com/en-us/articles/intel-many-core-testing-lab/). Part of the agreement to use it requires that you report back your experiences, which I did in an Intel forum post (http://software.intel.com/en-us/forums/showthread.php?t=81396). I thought this could be interesting to the Haskell community in general as well, so I'm reposting here, and pasting the text below for convenience. I've replaced the images with links. Is it possible for you to make the code for your benchmarks available? I'd be interested in analysing the results further. In our testing I've been able to achieve speedups over 20 on 24 cores with GHC 7.0.2, so there should be no reason in principle that you couldn't achieve similar results for obviously parallel problems, which yours seem to be. Some tweaking of GC parameters might be necessary: e.g. I've found that +RTS -A1m helps if your L2 caches are large enough. A good starting point for profiling is ThreadScope, which will tell you if the program is really trying to use all the cores or not. Cheers, Simon Cheers, Pedro As per the agreement with Intel, I am reporting my experiences with the Intel Manycore Testing Lab (Linux). This was my first time in the lab, and I wanted to test GHC's [1] SMP parallelism [2] features. The first challenge was to actually get GHC to work on the lab. There was a working version of ghc under /opt/ghc6.13/bin/ghc, but I really needed GHC 7. So first I built GHC 7.0.2-rc2, which worked without much trouble. Next step was to get all the necessary libraries in place. Since the lab has no direct internet access, cabal-install [3] wouldn't be of much use. Instead, I downloaded a snapshot of hackage [4] with the latest version of every package and manually installed the packages I needed. A bit boring, but doable. Finally I was ready to compile my programs and test. First thing I tried was an existing algorithm I had which, at some point, takes a list of about 500 trees and, for each tree, computes a measure which is expressed as a floating point number. This is basically a map over a list transforming each tree into a float. Each operation is independent of the others, and all require the same input, so it seems ideal for parallelisation. A quick benchmark revealed the following running times: http://dreixel.net/images/perm/ParList.png (Note the non-linear number of cores at the end of the x-axis.) Apparently there are performance gains with up to 6 cores; adding more cores after this makes the total running time worse. While this might sound bad, do note that all that was necessary to parallelise this algorithm was a one line change: basically, at the point where the list of floats @l@ is generated, it is replaced with @l `using` parList rdeepseq@. This change, together with recompilation using -threaded, is all that is necessary to parallelise this program. Later I performed a more accurate benchmark, this time using the equality function (take two elements and compare them for equality). The first step was to parallelise the equality function, which, again, is a very simple task: -- Tree datatype data Tree a = Leaf | Bin a (Tree a) (Tree a) -- Parallel equality eqTreePar :: Tree Int - Tree Int - Bool eqTreePar Leaf Leaf = True eqTreePar (Bin x1 l1 r1) (Bin x2 l2 r2) = x1 == x2 par l (pseq r (l r)) where l = eqTreePar l1 l2 r = eqTreePar r1 r2 eqTreePar _ _ = False `par` and `pseq` are the two primitives for parallelisation in GHC [5]. The performance graph follows: http://dreixel.net/images/perm/ParEq.png (This time I ran the benchmark several times; the error bars on the graph are the standard deviations.) Again we get performance improvements with up to 6 cores, and after that performance decreases. What I find really nice is the improvement with two cores, which is almost a 50% decrease in running time. The ratios for 2 to 4 cores wrt. the running time with 1 core are 0.52, 0.39, and 0.35, respectively. This is really good for such a simple change in the source code, and most people only have up to 4 cores anyway. In any case, the results of this (very preliminary) experiment seem to indicate that GHC's SMP parallelism is not particularly optimized for a high number of cores (yet). I'm planning to explore this line of research further, and I'm hoping to be able to conduct more experiments in the near future. Feel free to contact me if you want more information on what I've done. Cheers, Pedro [1] http://www.haskell.org/ghc/ [2]
Re: [Haskell-cafe] Data.ByteString.Lazy.ByteString vs Data.ByteString.Lazy.Internal.ByteString
On 14/03/2011 10:33, Christian Maeder wrote: Am 14.03.2011 06:26, schrieb C K Kashyap: Looks like a job for Data.Binary. I'd like to use it with just the libraries that are part of the platform I forgot to mention, Data.Binary does not seem to be in the platform. Right, it is not in the platform, but I would recommend to install those packages that you find useful (and vote for packages to be included into later versions of the platform.) Interestingly, there is a hidden package ghc-binary-0.5.0.2, which almost looks like binary-0.5.0.2. Maybe ghc developers and platform maintainers could comment on any differences. If there are none you could simple ghc-pkg expose ghc-binary. For future versions of ghc and the platform a single ghc-binary or binary version would be better. You shouldn't use ghc-binary. It is indeed the same as binary, and is required because GHC uses it internally, but binary is not a platform package so we renamed it to ghc-binary and set it to be hidden by default. Cheers, Simon ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] ANN: unordered-containers - a new, faster hashing-based containers library
On Mar 14, 2011 6:23 PM, Malcolm Wallace malcolm.wall...@me.com wrote: On 22 Feb 2011, at 22:21, Bryan O'Sullivan wrote: for some code that's (b) faster than anything else currently available I look forward to seeing some benchmarks against libraries other than containers, such as AVL trees, bytestring-trie, hamtmap, list-trie, etc. Good comparisons of different API-usage patterns are hard to come by. Milan Straka compared containers to a number of other libraries (including some of those you mentioned) and found them all to be slower. Since unordered-containers is faster (or sometimes as fast) as containers I haven't really bothered comparing it to libraries other than containers. Johan ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
[Haskell-cafe] Uninstall Haskell Platform on Mac OS X
Simple question which an hour of googling and a question on #haskell couldn't satisfy. :( I have installed the Haskell Platform 2011.2.0.0 on Mac OS X 10.6.6. Now how do I *uninstall* it? Thanks, Jesse ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Uninstall Haskell Platform on Mac OS X
On Monday, March 14, 2011 at 3:22 PM, Jesse Schalken wrote: Simple question which an hour of googling and a question on #haskell couldn't satisfy. :( I have installed the Haskell Platform 2011.2.0.0 on Mac OS X 10.6.6. Now how do I uninstall it? sudo /Library/Frameworks/GHC.framework/Versions/Current/Tools/Uninstaller ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] writing to a fifo when the reader stops reading
On Mon, 14 Mar 2011 02:33:13 -0400 Brandon S Allbery KF8NH allber...@gmail.com wrote: -BEGIN PGP SIGNED MESSAGE- Hash: SHA1 On 3/13/11 03:16 , bri...@aracnet.com wrote: ghc: fdWriteBuf: resource vanished (Broken pipe) which make sense, sort of. I write a value, let's say 10, and the reader reads it. It's the last value so it closes the fifo. Now there's nothing reading, so when I get to threadWaitWrite, I would expect the program to wait, just as it does when it starts up and there is no reader. FIFOs don't work that way; like a regular pipe, once all readers go away it doesn't work any more. You need to open it read-write initially to keep a reader around. Haskell has no control over this: it's how they're defined to work. ok, I wanted to make sure that I wasn't missing something on the Haskell side. In general, trying to use a FIFO like an AF_UNIX socket is a mistake. and using a socket doesn't really make sense because everything is running on the same host, always will be, and using sockets will unnecessarily complicate things. although it's not that bad and works really well. I'll go figure out a different strategy. Thank you, Brian ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Uninstall Haskell Platform on Mac OS X
According to the installer it puts symlinks for executables (a list of which is on the HP website) in /usr/bin, so you'll want to delete those. As far as I recall (I think the installer mentions something about this): - GHC is installed in /Library/Frameworks/GHC.framework - HP is installed in /Library/Haskell and /Library/Frameworks/HaskellPlatform.framework so deleting those should get rid of it. - Finally, cabal creates a local configuration and binaries folder ~/.cabal I'm not sure if this is the recommended uninstall method and I haven't tried it, but it should get rid of HP for you. On Mon, Mar 14, 2011 at 10:22 AM, Jesse Schalken jesseschal...@gmail.com wrote: Simple question which an hour of googling and a question on #haskell couldn't satisfy. :( I have installed the Haskell Platform 2011.2.0.0 on Mac OS X 10.6.6. Now how do I uninstall it? Thanks, Jesse ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe -- Edward Amsden Student Computer Science Rochester Institute of Technology www.edwardamsden.com ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Uninstall Haskell Platform on Mac OS X
This leaves the symlinks alex, cabal, cabal.real, cabal.wrap and happy in /usr/bin, and also leaves /Library/Frameworks/HaskellPlatform.framework, and while I can remove those myself how can I be certain there isn't something else left behind? On Tue, Mar 15, 2011 at 1:31 AM, Anders Persson anders.cj.pers...@gmail.com wrote: This is what I do. At a terminal prompt: sudo /Library/Frameworks/GHC.framework/Versions/Current/Tools/Uninstaller sudo rm -r /Library/Haskell Cheers, Anders On Mar 14, 2011, at 3:22 PM, Jesse Schalken wrote: Simple question which an hour of googling and a question on #haskell couldn't satisfy. :( I have installed the Haskell Platform 2011.2.0.0 on Mac OS X 10.6.6. Now how do I *uninstall* it? Thanks, Jesse ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Uninstall Haskell Platform on Mac OS X
I have done this and it has only removed GHC, not the rest of the Haskell Platform. On Tue, Mar 15, 2011 at 1:40 AM, Daniël de Kok m...@danieldk.eu wrote: On Monday, March 14, 2011 at 3:22 PM, Jesse Schalken wrote: Simple question which an hour of googling and a question on #haskell couldn't satisfy. :( I have installed the Haskell Platform 2011.2.0.0 on Mac OS X 10.6.6. Now how do I uninstall it? sudo /Library/Frameworks/GHC.framework/Versions/Current/Tools/Uninstaller ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] writing to a fifo when the reader stops reading
On Mon, Mar 14, 2011 at 9:44 AM, bri...@aracnet.com wrote: On Mon, 14 Mar 2011 02:33:13 -0400 Brandon S Allbery KF8NH allber...@gmail.com wrote: -BEGIN PGP SIGNED MESSAGE- Hash: SHA1 On 3/13/11 03:16 , bri...@aracnet.com wrote: ghc: fdWriteBuf: resource vanished (Broken pipe) which make sense, sort of. I write a value, let's say 10, and the reader reads it. It's the last value so it closes the fifo. Now there's nothing reading, so when I get to threadWaitWrite, I would expect the program to wait, just as it does when it starts up and there is no reader. FIFOs don't work that way; like a regular pipe, once all readers go away it doesn't work any more. You need to open it read-write initially to keep a reader around. Haskell has no control over this: it's how they're defined to work. ok, I wanted to make sure that I wasn't missing something on the Haskell side. In general, trying to use a FIFO like an AF_UNIX socket is a mistake. and using a socket doesn't really make sense because everything is running on the same host, always will be, and using sockets will unnecessarily complicate things. although it's not that bad and works really well. I think the prior emailer was recommending file sockets, not TCP sockets: http://en.wikipedia.org/wiki/Unix_domain_socket These only work on the same host. I'll go figure out a different strategy. Thank you, Brian ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Uninstall Haskell Platform on Mac OS X
This is a procedure suggested by Mark Lentczner on the haskell-platform mailing list. It clears out _any_ and _all_ versions of haskell platform, so use with care. /Anders Begin forwarded message: These installers don't attempt to uninstall prior versions, and depending on how your prior versions were installed, they may, or may not, happily co-exist with this installation. I'm interested to hear experience reports of trying these installers both systems both with and without prior Haskell setups. You can probably erase most (all?) traces of a prior Haskell install with this procedure: sudo rm -rf /Library/Frameworks/GHC.framework sudo rm -rf /Library/Frameworks/HaskellPlatform.framework sudo rm -rf /Library/Haskell rm -rf .cabal rm -rf .ghc rm -rf ~/Library/Haskell find /usr/bin /usr/local/bin -type l | \ xargs -If sh -c '/bin/echo -n f /; readlink f' | \ egrep '//Library/(Haskell|Frameworks/(GHC|HaskellPlatform).framework)' | \ cut -f 1 -d ' ' /tmp/hs-bin-links # review /tmp/hs-links sudo rm `cat /tmp/hs-bin-links` On Mar 14, 2011, at 3:48 PM, Jesse Schalken wrote: This leaves the symlinks alex, cabal, cabal.real, cabal.wrap and happy in /usr/bin, and also leaves /Library/Frameworks/HaskellPlatform.framework, and while I can remove those myself how can I be certain there isn't something else left behind? On Tue, Mar 15, 2011 at 1:31 AM, Anders Persson anders.cj.pers...@gmail.com wrote: This is what I do. At a terminal prompt: sudo /Library/Frameworks/GHC.framework/Versions/Current/Tools/Uninstaller sudo rm -r /Library/Haskell Cheers, Anders On Mar 14, 2011, at 3:22 PM, Jesse Schalken wrote: Simple question which an hour of googling and a question on #haskell couldn't satisfy. :( I have installed the Haskell Platform 2011.2.0.0 on Mac OS X 10.6.6. Now how do I uninstall it? Thanks, Jesse ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
[Haskell-cafe] Question on a common pattern
In my code, I'm doing this quite a lot: x - someIO case x of Opt1 - ... Having a line for extracting the value from the IO (or STM) and then acting on the value seems unnatural. Is there a more concise way to do this? This code: case someIO of Opt1 - ... Doesn't work, but is there something like that, that is valid? ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Question on a common pattern
See this thread: http://www.haskell.org/pipermail/haskell-cafe/2010-October/084291.html On 14 March 2011 15:48, tsuraan tsur...@gmail.com wrote: In my code, I'm doing this quite a lot: x - someIO case x of Opt1 - ... Having a line for extracting the value from the IO (or STM) and then acting on the value seems unnatural. Is there a more concise way to do this? This code: case someIO of Opt1 - ... Doesn't work, but is there something like that, that is valid? ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe -- Ozgur Akgun ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Question on a common pattern
Your first line is entirely natural. The alternative doesn't look right at all. I am not aware of a more concise alternative to this general construction (assuming there are multiple case alternative, and that the work can't be done with library functions). Chris From: haskell-cafe-boun...@haskell.org [mailto:haskell-cafe-boun...@haskell.org] On Behalf Of tsuraan Sent: 14 March 2011 15:49 To: haskell-cafe@haskell.org Subject: [Haskell-cafe] Question on a common pattern In my code, I'm doing this quite a lot: x - someIO case x of Opt1 - ... Having a line for extracting the value from the IO (or STM) and then acting on the value seems unnatural. Is there a more concise way to do this? This code: case someIO of Opt1 - ... Doesn't work, but is there something like that, that is valid? ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe _ No virus found in this message. Checked by AVG - www.avg.com Version: 10.0.1204 / Virus Database: 1498/3506 - Release Date: 03/14/11 ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Question on a common pattern
If you have only one alternative, then you can simply do: Opt1 - someIO E.g., if you are _sure_ that foo returns always a 'Just' within a monad you can perfectly do : Just x - foo 2011/3/14 tsuraan tsur...@gmail.com In my code, I'm doing this quite a lot: x - someIO case x of Opt1 - ... Having a line for extracting the value from the IO (or STM) and then acting on the value seems unnatural. Is there a more concise way to do this? This code: case someIO of Opt1 - ... Doesn't work, but is there something like that, that is valid? ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Question on a common pattern
See this thread: http://www.haskell.org/pipermail/haskell-cafe/2010-October/084291.html Which links to http://hackage.haskell.org/trac/ghc/ticket/4359 . Looks like there's already been quite a bit of discussion on this already :) Thanks for the link. ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Question on a common pattern
If you have only one alternative, then you can simply do: Opt1 - someIO E.g., if you are _sure_ that foo returns always a 'Just' within a monad you can perfectly do : Just x - foo That's interesting. I had no idea that one could do that. I think what I'm looking for is something along the lines of lambda-case, but thanks for the tip. ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
[Haskell-cafe] Wanted: composoable parsers from haskell-src-exts
Hi. I want to use parsers from haskell-src-exts as sub-parsers, which does not seem to work since they insist on consuming the input completely. I would need them to parse a maximal prefix, and return the (unconsumed) rest of input as well (cf. http://hackage.haskell.org/packages/archive/parsec/3.1.1/doc/html/Text-Parsec-Prim.html#v:getInput ) I figure that happy has the %partial directive for that, but the description http://www.haskell.org/happy/doc/html/sec-directives.html#sec-partial-parsers does not really tell me how to obtain the rest of the input. Any hints (or code samples) appreciated. Thanks - J.W. ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Wanted: composoable parsers from haskell-src-exts
I haven't tried myself - but from the docs, partial parsers seem to depend on finding an error token so they seem to be partial as in handles failure. If you want to parse specific fragments you probably want to generate multiple parsers from a single grammar see section 2.7. ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
[Haskell-cafe] ANN: craftwerk-0.1, craftwerk-cairo-0.1, craftwerk-gtk-0.1
Dear all, I just released the first version of the Craftwerk graphics library for 2d vector graphics. Craftwerk is intended to act as an abstract interface to different backend drivers. The library itself has a TikZ (http://sourceforge.net/projects/pgf) driver builtin to output vector graphics for use in LaTeX documents. The craftwerk-cairo library supplies a Cairo output function to the library. The aim is to support these two backends in a seamless manner such that graphics created with either backend are not or nearly not distinguishable. The third package (craftwerk-gtk) contains convenience functions to display graphics created with craftwerk directly in a Gtk window, including the basic zooming, PDF TikZ export via a file chooser dialog. It also allows to create a simple user interface that passes options to the rendering function. The feature support is rather rudimentary at the moment, but for current Cairo users most features should be already available from within the craftwerk API. The aim is to support more high level functions like TikZ offers. The project started when I realized that I need to prepare a lot of visualizations at university twice, once for display and once for print. I hope that this library proves to be useful for people with similar tasks. A great thing would be if the Chart library allows to plug another backend in. I haven't really looked into that, but this would allow me to leave Gnuplot and R behind for most purposes and at the same time get higher quality output that is better integrable. I started learning Haskell only half a year ago and this is my first real project. So far I have to say that I enjoy it very much. Therefore, if you find some weird constructions or have any comments about the design of the library, I'm looking forward for any feedback! The source repository can be found under: https://github.com/mahrz/Craftwerk and packages here: http://hackage.haskell.org/package/craftwerk-0.1 http://hackage.haskell.org/package/craftwerk-cairo-0.1 http://hackage.haskell.org/package/craftwerk-gtk-0.1 Best, Malte -- Malte Harder malte.har...@gmail.com ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] [Haskell] ANN: craftwerk-0.1, craftwerk-cairo-0.1, craftwerk-gtk-0.1
2011/3/14 Malte Harder malte.har...@googlemail.com: Dear all, I just released the first version of the Craftwerk graphics library for 2d vector graphics. Craftwerk is intended to act as an abstract interface to different backend drivers. The library itself has a TikZ (http://sourceforge.net/projects/pgf) driver builtin to output vector graphics for use in LaTeX documents. The craftwerk-cairo library supplies a Cairo output function to the library. The aim is to support these two backends in a seamless manner such that graphics created with either backend are not or nearly not distinguishable. The third package (craftwerk-gtk) contains convenience functions to display graphics created with craftwerk directly in a Gtk window, including the basic zooming, PDF TikZ export via a file chooser dialog. It also allows to create a simple user interface that passes options to the rendering function. The feature support is rather rudimentary at the moment, but for current Cairo users most features should be already available from within the craftwerk API. The aim is to support more high level functions like TikZ offers. The project started when I realized that I need to prepare a lot of visualizations at university twice, once for display and once for print. I hope that this library proves to be useful for people with similar tasks. A great thing would be if the Chart library allows to plug another backend in. I haven't really looked into that, but this would allow me to leave Gnuplot and R behind for most purposes and at the same time get higher quality output that is better integrable. I started learning Haskell only half a year ago and this is my first real project. So far I have to say that I enjoy it very much. Therefore, if you find some weird constructions or have any comments about the design of the library, I'm looking forward for any feedback! The source repository can be found under: https://github.com/mahrz/Craftwerk and packages here: http://hackage.haskell.org/package/craftwerk-0.1 http://hackage.haskell.org/package/craftwerk-cairo-0.1 http://hackage.haskell.org/package/craftwerk-gtk-0.1 Hi Malte, Your project sounds very good (I will unfortunately not have time to look at it carefully before some time). I guess you know about reddit, anyway there is a thread about your library there: http://www.reddit.com/r/haskell/comments/g3xp1/craftwerk_a_highlevel_and_easy_to_use_graphics/ Could you please as suggest one comment include some screenshots (even better with some code next to them) on the homepage? Thanks for making the code available on both github and hackage! Thu ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] [Haskell] ANN: craftwerk-0.1, craftwerk-cairo-0.1, craftwerk-gtk-0.1
Hi Thu, Could you please as suggest one comment include some screenshots (even better with some code next to them) on the homepage? indeed, that's a good idea. I just put two examples up. There will be some more examples coming soon. Best, Malte ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
[Haskell-cafe] simple stm question
I recently upgraded to ghc 7.0.2 from 6.12.3, along with the Haskell platform, and noticed that the following code no longer works as expected: waitFor tvar = atomically $ do count - readTVar tvar check (count == 0) worker tchan tvar = loop where loop = do putStrLn checking finished - atomically $ isEmptyTChan tchan threadDelay 5 if finished then atomically $ do val - readTVar tvar writeTVar tvar $ (subtract 1) val else (atomically $ readTChan tchan) loop test = do tchan - newTChanIO pure $ forM_ [1..5] $ writeTChan tchan -- THIS LINE tvar - newTVarIO 1 forkIO $ worker tchan tvar waitFor tvar putStrLn DONE This will work if I use atomically, but otherwise it does nothing, tchan remains empty afterwards. I'm not clear how this should behave. ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] simple stm question
I recently upgraded to ghc 7.0.2 from 6.12.3, along with the Haskell platform, and noticed that the following code no longer works as expected: waitFor tvar = atomically $ do count - readTVar tvar check (count == 0) worker tchan tvar = loop where loop = do putStrLn checking finished - atomically $ isEmptyTChan tchan threadDelay 5 if finished then atomically $ do val - readTVar tvar writeTVar tvar $ (subtract 1) val else (atomically $ readTChan tchan) loop test = do tchan - newTChanIO pure $ forM_ [1..5] $ writeTChan tchan -- THIS LINE tvar - newTVarIO 1 forkIO $ worker tchan tvar waitFor tvar putStrLn DONE You did not include your imports, but I assume that's Control.Applicative.pure. If so, that line should never do anything. pure for IO is the same as return - you are never running the STM action that line calculates. It's the same as if you had written test = do tchan - newTChanIO let neverGetsUsed = forM_ [1..5] $ writeTChan tchan -- THIS LINE tvar - newTVarIO 1 forkIO $ worker tchan tvar waitFor tvar putStrLn DONE Brandon ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] simple stm question
On Mon, Mar 14, 2011 at 11:56 PM, qld3303 qld3...@gmail.com wrote: This will work if I use atomically, but otherwise it does nothing, tchan remains empty afterwards. I'm not clear how this should behave. You really should use atomically on that line. I don't see how it worked before. -- Felipe. ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] simple stm question
I must've been mistaken. Thanks On Mon, Mar 14, 2011 at 7:05 PM, Felipe Almeida Lessa felipe.le...@gmail.com wrote: On Mon, Mar 14, 2011 at 11:56 PM, qld3303 qld3...@gmail.com wrote: This will work if I use atomically, but otherwise it does nothing, tchan remains empty afterwards. I'm not clear how this should behave. You really should use atomically on that line. I don't see how it worked before. -- Felipe. ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
[arch-haskell] AUR Out-of-date Notification for haskell-haskellformaths
Your package haskell-haskellformaths has been flagged out of date by Sara [1]. You may view your package at: http://aur.archlinux.org/packages.php?ID=2 [1] - http://aur.archlinux.org/account.php?Action=AccountInfoID=12529 ___ arch-haskell mailing list arch-haskell@haskell.org http://www.haskell.org/mailman/listinfo/arch-haskell
[arch-haskell] AUR Comment for haskell-yesod
from http://aur.archlinux.org/packages.php?ID=35370 pdxleif wrote: Apparently this package triggers a compiler error in GHC 7.0.2. http://hackage.haskell.org/trac/ghc/ticket/5004 --- If you no longer wish to receive notifications about this package, please go the the above package page and click the UnNotify button. ___ arch-haskell mailing list arch-haskell@haskell.org http://www.haskell.org/mailman/listinfo/arch-haskell
[arch-haskell] AUR Comment for haskell-yesod
from http://aur.archlinux.org/packages.php?ID=35370 deteego wrote: You can add the -fproduction flag to setup configure in the PKGBUILD to build yesod with GHC 7.0.2. i.e. change runhaskell Setup configure -O --enable-split-objs --enable-shared to runhaskell Setup configure -O --enable-split-objs --enable-shared -fproduction --- If you no longer wish to receive notifications about this package, please go the the above package page and click the UnNotify button. ___ arch-haskell mailing list arch-haskell@haskell.org http://www.haskell.org/mailman/listinfo/arch-haskell
[arch-haskell] AUR Out-of-date Notification for haskell-hinotify
Your package haskell-hinotify has been flagged out of date by cgirard [1]. You may view your package at: http://aur.archlinux.org/packages.php?ID=17596 [1] - http://aur.archlinux.org/account.php?Action=AccountInfoID=16599 ___ arch-haskell mailing list arch-haskell@haskell.org http://www.haskell.org/mailman/listinfo/arch-haskell
[arch-haskell] AUR Comment for lhs2tex
from http://aur.archlinux.org/packages.php?ID=12648 benediktf wrote: I had the same error. It worked after running: sudo chmod a+r -R /usr/share/lhs2tex-1.16 --- If you no longer wish to receive notifications about this package, please go the the above package page and click the UnNotify button. ___ arch-haskell mailing list arch-haskell@haskell.org http://www.haskell.org/mailman/listinfo/arch-haskell
Re: [arch-haskell] Please contribute patches
I submitted a pull request for yesod and a number of other things: https://github.com/archhaskell/habs/pull/47 https://github.com/archhaskell/habs/pull/47Do I also need to drop a note here for it to get noticed, or what is the preferred way of notifying about such things? -Leif Warner On Sun, Mar 13, 2011 at 7:55 AM, Peter Simons sim...@cryp.to wrote: Hi guys, the following packages don't build anymore because of version conflicts: agda-executable haskell-agda haskell-authenticate haskell-dbus-core haskell-libxml-sax haskell-sifflet-lib haskell-yesod-auth haskell-yesod-core haskell-yesod-form haskell-yesod-json haskell-yesod-persistent haskell-yesod-static haskell-yesod sifflet yi I guess that the problems are simple to fix, but if anyone happens to have such a fix already, then please send in a patch! It's probably easiest to post the output from 'git format-patch' to this list. If you prefer to work via Github, then the usual fork/merge-request procedure for the archhaskell/habs repository works fine, too, of course. Take care, Peter ___ arch-haskell mailing list arch-haskell@haskell.org http://www.haskell.org/mailman/listinfo/arch-haskell ___ arch-haskell mailing list arch-haskell@haskell.org http://www.haskell.org/mailman/listinfo/arch-haskell
Re: [arch-haskell] Please contribute patches
Hi Leif, I submitted a pull request for yesod and a number of other things: https://github.com/archhaskell/habs/pull/47. Do I also need to drop a note here for it to get noticed, or what is the preferred way of notifying about such things? as of now, I don't receive e-mail notifications when a pull request is opened. I've tried to enable that feature in Github, but I couldn't figure out how to do it. Notificationts seem to be enabled for repositories that my user owns, but 'archhaskell/habs' isn't one of them. Duh. :-( It's probably best to send an e-mail to this list, too, when filing a pull request. Take care, Peter ___ arch-haskell mailing list arch-haskell@haskell.org http://www.haskell.org/mailman/listinfo/arch-haskell
Re: [arch-haskell] Please contribute patches
On Mon, Mar 14, 2011 at 19:22, Peter Simons sim...@cryp.to wrote: Hi Leif, I submitted a pull request for yesod and a number of other things: https://github.com/archhaskell/habs/pull/47. Do I also need to drop a note here for it to get noticed, or what is the preferred way of notifying about such things? as of now, I don't receive e-mail notifications when a pull request is opened. I've tried to enable that feature in Github, but I couldn't figure out how to do it. Notificationts seem to be enabled for repositories that my user owns, but 'archhaskell/habs' isn't one of them. Duh. :-( I had that problem myself in the beginning, what I found out was that you need to be member of a team that has access to the repo. There is a notice of it, but I didn't see it until long after I got help from the github team. /M -- Magnus Therning OpenPGP: 0xAB4DFBA4 email: mag...@therning.org jabber: mag...@therning.org twitter: magthe http://therning.org/magnus ___ arch-haskell mailing list arch-haskell@haskell.org http://www.haskell.org/mailman/listinfo/arch-haskell
