March 2012 - Haskell - Haskell.org

ANNOUNCE: ioctl 0.0.1
by Maciej Piechotka 13 Sep '15

13 Sep '15

A package for type-safe I/O control. Currently only ioctl is supported. Currently simply a extract from my tuntap fork TODO: - Return the integer as well as structure (will break the API) - Port for Windows Network.Socket.IOCtl (as soon as I manage to setup some sane environment on this platform) - Wrapping around DeviceIoControl Example (in hsc): data NotRead = NotRead instance NotRead Int where ioctlReq _ = #const FIONREAD notRead s = ioctlsocket' s NotRead Regards

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CFP: Term and Graph rewriting, special issue of MSCS
by Rachid Echahed 13 Feb '14

13 Feb '14

-------------------------------------------------------------------------- First Call for Papers Special Issue of Mathematical Structures in Computer Science (MSCS) on "TERM and GRAPH Rewriting" -------------------------------------------------------------------------- Scope -------------------------------------------------------------------------- Rewriting techniques constitute a foundational theory of computing science. They are being investigated for several structures such as lambda-terms, first-order terms or graphs and have been successfully used in many areas such as programming languages, automated reasoning, program verification, security, etc. This is witnessed by the leading international events ICGT, RTA or TLCA among others. During the last decade, a particular interest has been devoted to the study of the impact of shared structures in term and graph rewriting through the international editions of TERMGRAPH series of workshops. Sharing is indeed ubiquitous in several research areas, for instance: the modelling of first- and higher-order term rewriting by (acyclic or cyclic) graph rewriting, the modelling of biological or chemical abstract machines, the implementation techniques of programming languages. Term and graph rewriting are also used in automated theorem proving and symbolic computation systems working on shared structures... This special issue is devoted to recent developments in all aspects of TERM and GRAPH rewriting. This includes (but is not limited to): term rewriting, graph transformation, proof methods, programming languages, infinitary rewriting, rewrite strategies, semantics, properties of rewriting ... -------------------------------------------------------------------------- Submissions -------------------------------------------------------------------------- Submitted papers must be original and not submitted for publication elsewhere, and will be subject to the standard journal refereeing process of the Mathematical Structures in Computer Science (MSCS) journal. Submissions should be in pdf format following the MSCS instruction for contributors (http://assets.cambridge.org/MSC/MSC_ifc.pdf) and should be submitted electronically via the following easy-chair web site: https://www.easychair.org/conferences/?conf=mscsrewriting2012 -------------------------------------------------------------------------- Important Dates -------------------------------------------------------------------------- January 20, 2012 : Abstract submission February 20, 2012: Paper submission June 15, 2012 : Notification of acceptance -------------------------------------------------------------------------- Guest Editor: -------------------------------------------------------------------------- Rachid Echahed, CNRS LIG Lab., Grenoble, France echahed(a)imag.fr --------------------------------------------------------------------------

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cabal-install and ghc compatibility
by briand＠aracnet.com 31 Mar '12

31 Mar '12

Hello, I've got ghc 7.2.2 installed. trying to install cabal-install-0.10.2 results in: Linking Setup ... Configuring Cabal-1.10.1.0... Setup: At least the following dependencies are missing: base >=4 && <3 && >=2 && <5, unix >=2.0 && <2.5 Error during cabal-install bootstrap: Configuring the Cabal package failed Do I need to be using development versions of cabal/cabal-install if I'm also going to be using newer versions of ghc ? How do I know which version of cabal are compatible with which versions of ghc without trying to install it and seeing if it works ? Thank you, Brian

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DHD >>= UHac: Register by April 1 for the DHD
by Sean Leather 30 Mar '12

30 Mar '12

DHD >>= UHac will be held from Friday, April 20, to Sunday, April 22, 2012. The Dutch HUG Day (DHD) is on the first day. The Utrecht Hackathon (UHac) follows the DHD on Friday and continues through the weekend. http://www.haskell.org/haskellwiki/DHD_UHac *Please register for the DHD by Sunday, April 1.* Our sponsor for the DHD, Ordina, will use the registration to prepare the (free!) lunch and venue. If you're coming only to UHac and not the DHD, you can register by April 19. http://www.haskell.org/haskellwiki/DHD_UHac/Register See you in Utrecht! The Organizers: Sean Leather Jurriën Stutterheim Jurriaan Hage

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Faça parte da minha rede no LinkedIn
by Carlos Camarao Figueiredo 29 Mar '12

29 Mar '12

LinkedIn ------------ Eu gostaria de adicioná-lo à minha rede profissional no LinkedIn. -Carlos Camarao Carlos Camarao Figueiredo Professor na UFMG Belo Horizonte e Região, Brasil Confirme que você conhece Carlos Camarao Figueiredo: https://www.linkedin.com/e/-y1615u-h0e41zcs-6/isd/6485083911/4PS7AfCQ/?hs=f… -- Você está recebendo convites de conexão por e-mail. Clique aqui para parar de recebê-los: http://www.linkedin.com/e/-y1615u-h0e41zcs-6/A5eR2FIG5M9-4jk43rQ4JqtVY2yX2K… (c) 2012 LinkedIn Corporation. 2029 Stierlin Ct, Mountain View, CA 94043 - EUA.

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ANNOUNCE: haskell-src-exts-1.13.0
by Niklas Broberg 29 Mar '12

29 Mar '12

Fellow Haskelleers, I'm pleased to announce the release of haskell-src-exts-1.13.0! * On hackage: http://hackage.haskell.org/package/haskell-src-exts * Via cabal: cabal install haskell-src-exts * Darcs repo: http://code.haskell.org/haskell-src-exts It's been a *very short* while since the last update before this, and another (smallish) major release it is. Sorry about that (especially to Neil who was quick to update). The main update of this release is to add support for DoAndIfThenElse, which means haskell-src-exts at long last is compliant with Haskell2010. This is also the cause for the backwards-incompatible change: default parse mode is now to use Haskell2010 mode. In particular this means that NPlusKPatterns is no longer recognized by default. No old code using haskell-src-exts should fail to compile (unless really unlucky with clashing imports from L.H.E.Extension), but it may now fail to work on some Haskell98-compliant source files. Changelog: 1.12.0 --> 1.13.0 =============== * Add extensions DoAndIfThenElse and NPlusKPatterns to Language.Haskell.Exts.Extensions. * DoAndIfThenElse is now supported, at long last, making HSE compatible with Haskell2010 * Introduce haskell98 and haskell2010 extension groups, exported from Language.Haskell.Exts.Extensions. * Backwards-incompatible change: default parse mode is now to use haskell2010, which means the following features are recognized by default: DoAndIfThenElse, PatternGuards, ForeignFunctionInterface, EmptyDataDecls. NPlusKPatterns is no longer recognized by default. Cheers, /Niklas

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CALL FOR PARTICIPATION: FLOPS 2012
by Peter Thiemann 29 Mar '12

29 Mar '12

CALL FOR PARTICIPATION: FLOPS 2012 ================================== Eleventh International Symposium on Functional and Logic Programming May 23-25, 2012 Takikawa Memorial Hall, Kobe University, Kobe, Japan http://www.org.kobe-u.ac.jp/flops2012/ *Early Registration: April 25 (Wed)* FLOPS is a forum for research on all issues concerning declarative programming, including functional programming and logic programming, and aims to promote cross-fertilization and integration between the two paradigms. The 23rd International Conference on Rewriting Techniques and Applications (RTA 2012) and satellite workshops including WFLP 2012 will be held in the week after FLOPS at Nagoya, Japan. Invited Speakers @ FLOPS ================ - Tachio Terauchi (Graduate School of Information Science, Nagoya University). Automated Verification of Higher-order Functional Programs - Michael Codish (Department of Computer Science, Ben-Gurion University of the Negev). Programming with Boolean Satisfaction - Stephanie Weirich (School of Engineering and Applied Science, University of Pennsylvania). Dependently-typed programming in GHC See the full program at http://www.org.kobe-u.ac.jp/flops2012/program.html Register now at http://www.org.kobe-u.ac.jp/flops2012/index.html#REGISTRATION CONFERENCE ORGANIZERS GENERAL CHAIR ============= - Naoyuki Tamura (Kobe University, Japan) PROGRAM CO-CHAIRS ================= - Tom Schrijvers (Ghent University, Belgium) - Peter Thiemann (University of Freiburg, Germany) CONFERENCE SPONSORS =================== - Japan Society for Software Science and Technology (JSSST) SIGPPL - Information Science and Technology Center, Kobe University IN COOPERATION WITH =================== - ACM SIGPLAN - Asian Association for Foundation of Software (AAFS) - Association for Logic Programming (ALP)

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Haskell Weekly News: Issue 220
by Daniel Santa Cruz 29 Mar '12

29 Mar '12

Welcome to issue 220 of the HWN, an issue covering crowd-sourced bits of information about Haskell from around the web. This issue covers the week of March 18 to 24, 2012. Quotes of the Week * shachaf: Type classes are a scary story that you tell new Haskellers so they can go to sleep at night. * acowley: Parametric polymorphism is the inspiring story you tell them to get them riled up and raring to go. It's like Braveheart for programmers. * monochrom: the purpose of types is to ban more programs * rostayob: I was a type constructor, then I took an arrow in the kind * shachaf: @let otherfoolish = not otherwise * flebron: Monoidal objects in the monoidal category of endofunctors on a category. I took a small detour through tensor products to understand monoidal categories better, with one example of such a product. mauke: I have no idea what you just said * weexplat: starts a proposal to replace launchMissiles with atomicDestroyBiosphere * monochrom: rumour: SPJ will write a thick book "A New Science of Kind" * JonathanShapiro: [on abandoning BitC] "And I *still* don't believe in monads. :-)" Top Reddit Stories * Starting the Mezzo Haskell Book Domain: yesodweb.com, Score: 58, Comments: 28 On Reddit: [1] http://goo.gl/pOSlR Original: [2] http://goo.gl/ecy4O * First patches for iPhone cross compiler against GHC head Domain: haskell.org, Score: 55, Comments: 27 On Reddit: [3] http://goo.gl/OOAai Original: [4] http://goo.gl/p7C3L * Retrospective thoughts on BitC by its author, and why type classes didn't work for him Domain: coyotos.org, Score: 44, Comments: 22 On Reddit: [5] http://goo.gl/0sL80 Original: [6] http://goo.gl/5pCp2 * Google Summer of Code 2012 - Haskell.org is participating Domain: haskell.org, Score: 42, Comments: 11 On Reddit: [7] http://goo.gl/9EwzD Original: [8] http://goo.gl/XqcUJ * Conduits vs. Pipes. Using Void as an Input or Output type can reduce the number of concepts (source, sink, conduit) from 3 to 1 (pipe). Domain: twanvl.nl, Score: 34, Comments: 50 On Reddit: [9] http://goo.gl/bc8RB Original: [10] http://goo.gl/eb7oz * Announcing conduit 0.3 Domain: yesodweb.com, Score: 33, Comments: 9 On Reddit: [11] http://goo.gl/JrgV0 Original: [12] http://goo.gl/OsDl7 * Haskell for embedded domain-specific languages (Functional Programming eXchange 2012) Domain: skillsmatter.com, Score: 31, Comments: 4 On Reddit: [13] http://goo.gl/pSREX Original: [14] http://goo.gl/1azVh * Domain theory course Domain: cs.nott.ac.uk, Score: 31, Comments: 5 On Reddit: [15] http://goo.gl/5VHyG Original: [16] http://goo.gl/o2pRC * ANNOUNCE: options, an easy-to-use command-line option parser Domain: self.haskell, Score: 29, Comments: 21 On Reddit: [17] http://goo.gl/s6ktw Original: [18] http://goo.gl/s6ktw * A Case Study in Creating Rich Internet Apps in Haskell (Silk at FP eXchange 2012) Domain: skillsmatter.com, Score: 22, Comments: 18 On Reddit: [19] http://goo.gl/ZdtDq Original: [20] http://goo.gl/Ta2HQ * It just occurred to me that (lift .) defines a functor... Domain: self.haskell, Score: 22, Comments: 15 On Reddit: [21] http://goo.gl/GMzPt Original: [22] http://goo.gl/GMzPt Top StackOverflow Questions * Haskell platform: nested functions and optimization votes: 15, answers: 2 Read on SO: [23] http://goo.gl/nreIr * newtype with RankNTypes votes: 14, answers: 2 Read on SO: [24] http://goo.gl/UT9DV * Pattern Matching - Prolog Vs Haskell votes: 13, answers: 4 Read on SO: [25] http://goo.gl/3hZV1 * How does this definition of ArrowLoop.loop work? votes: 13, answers: 2 Read on SO: [26] http://goo.gl/ocSCM * Data.Set : does it always know best? votes: 12, answers: 2 Read on SO: [27] http://goo.gl/NUjkB * Building a histogram with haskell, many times slower than with python votes: 11, answers: 3 Read on SO: [28] http://goo.gl/kbh5i * What is the scope of let when used without in? votes: 11, answers: 2 Read on SO: [29] http://goo.gl/bNwna * Strange "half to even" rounding in different languages [closed] votes: 11, answers: 3 Read on SO: [30] http://goo.gl/lnPch * Practical reasons for Сhurch Encoding votes: 10, answers: 1 Read on SO: [31] http://goo.gl/xYoef * Can the FFI deal with arrays? If so, how? votes: 9, answers: 3 Read on SO: [32] http://goo.gl/d4R3H Until next time, Daniel Santa Cruz References 1. http://www.yesodweb.com/blog/2012/03/start-mezzo-haskell 2. http://www.reddit.com/r/haskell/comments/r9xdq/starting_the_mezzo_haskell_b… 3. http://www.haskell.org/pipermail/iphone/2012-March/000120.html 4. http://www.reddit.com/r/haskell/comments/r3ge7/first_patches_for_iphone_cro… 5. http://www.coyotos.org/pipermail/bitc-dev/2012-March/003300.html 6. http://www.reddit.com/r/haskell/comments/rbk7z/retrospective_thoughts_on_bi… 7. http://www.haskell.org/pipermail/haskell-cafe/2012-March/100247.html 8. http://www.reddit.com/r/haskell/comments/r5h81/google_summer_of_code_2012_h… 9. http://twanvl.nl/blog/haskell/conduits-vs-pipes 10. http://www.reddit.com/r/haskell/comments/rbgvz/conduits_vs_pipes_using_void… 11. http://www.yesodweb.com/blog/2012/03/announcing-conduit-0-3 12. http://www.reddit.com/r/haskell/comments/r6wdh/announcing_conduit_03/ 13. http://skillsmatter.com/podcast/scala/haskell-for-embedded-domain-specific-… 14. http://www.reddit.com/r/haskell/comments/r22d6/haskell_for_embedded_domains… 15. http://www.cs.nott.ac.uk/~gmh/domains.html 16. http://www.reddit.com/r/haskell/comments/r250h/domain_theory_course/ 17. http://www.reddit.com/r/haskell/comments/rbpmb/announce_options_an_easytous… 18. http://www.reddit.com/r/haskell/comments/rbpmb/announce_options_an_easytous… 19. http://skillsmatter.com/podcast/home/silkapp-a-case-study-in-creating-rich-… 20. http://www.reddit.com/r/haskell/comments/r1xey/a_case_study_in_creating_ric… 21. http://www.reddit.com/r/haskell/comments/raxsk/it_just_occurred_to_me_that_… 22. http://www.reddit.com/r/haskell/comments/raxsk/it_just_occurred_to_me_that_… 23. http://stackoverflow.com/questions/9757515/haskell-platform-nested-function… 24. http://stackoverflow.com/questions/9779301/newtype-with-rankntypes 25. http://stackoverflow.com/questions/9780779/pattern-matching-prolog-vs-haske… 26. http://stackoverflow.com/questions/9856342/how-does-this-definition-of-arro… 27. http://stackoverflow.com/questions/9755851/data-set-does-it-always-know-best 28. http://stackoverflow.com/questions/9772098/building-a-histogram-with-haskel… 29. http://stackoverflow.com/questions/9777399/what-is-the-scope-of-let-when-us… 30. http://stackoverflow.com/questions/9829769/strange-half-to-even-rounding-in… 31. http://stackoverflow.com/questions/9806729/practical-reasons-for-hurch-enco… 32. http://stackoverflow.com/questions/9854782/can-the-ffi-deal-with-arrays-if-…

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ANNOUNCE: haskell-src-exts-1.12.0
by Niklas Broberg 27 Mar '12

27 Mar '12

Fellow Haskelleers, I'm pleased to announce the release of haskell-src-exts-1.12.0! * On hackage: http://hackage.haskell.org/package/haskell-src-exts * Via cabal: cabal install haskell-src-exts * Darcs repo: http://code.haskell.org/haskell-src-exts It's been a long while since the last update before this, but it is my definite hope that I will once again be able to update regularly. This major release primarily enables the (relatively) new quasi-quoter syntax. The "major" version bump is questionable, but better safe than sorry. The only backwards incompatible change is that pretty- and exact-printing now use the new quasi-quoter syntax, which makes the round-tripping 'exactPrint . parse' cycle fail for code using the old syntax. There are more changes in the pipeline, some larger and some smaller. Stay tuned! Changelog: 1.11.1 --> 1.12.0 =============== * Move from old [$...| quasi-quote syntax to the new [...| one. The old syntax is still recognized while parsing. * Allow symbols as variables when TypeOperators is enabled. * Rename ExplicitForall in ExplicitForAll, to be consistent with GHC and the Haskell' process. Cheers, /Niklas

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ANNOUNCE: GHC version 7.2.1
by Ian Lynagh 26 Mar '12

26 Mar '12

============================================================= The (Interactive) Glasgow Haskell Compiler -- version 7.2.1 ============================================================= The GHC Team is pleased to announce a new major release of GHC, 7.2.1. The 7.2 branch is intended to be more of a "technology preview" than normal GHC stable branches; in particular, it supports a significantly improved version of DPH, as well as new features such as compiler plugins and "safe Haskell". The design of these new features may evolve as we get more experience with them. See the release notes for more details of what's new and what's changed. We are also using this branch as an opportunity to work out the best workflows to use with git. We expect the 7.2 branch to be short-lived, with 7.4.1 coming out shortly after ICFP as normal. Full release notes are here: http://www.haskell.org/ghc/docs/7.2.1/html/users_guide/release-7-2-1.html How to get it ~~~~~~~~~~~~~ The easy way is to go to the web page, which should be self-explanatory: http://www.haskell.org/ghc/ We supply binary builds in the native package format for many platforms, and the source distribution is available from the same place. Packages will appear as they are built - if the package for your system isn't available yet, please try again later. Background ~~~~~~~~~~ Haskell is a standard lazy functional programming language. GHC is a state-of-the-art programming suite for Haskell. Included is an optimising compiler generating good code for a variety of platforms, together with an interactive system for convenient, quick development. The distribution includes space and time profiling facilities, a large collection of libraries, and support for various language extensions, including concurrency, exceptions, and foreign language interfaces (C, whatever). GHC is distributed under a BSD-style open source license. A wide variety of Haskell related resources (tutorials, libraries, specifications, documentation, compilers, interpreters, references, contact information, links to research groups) are available from the Haskell home page (see below). On-line GHC-related resources ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Relevant URLs on the World-Wide Web: GHC home page http://www.haskell.org/ghc/ GHC developers' home page http://hackage.haskell.org/trac/ghc/ Haskell home page http://www.haskell.org/ Supported Platforms ~~~~~~~~~~~~~~~~~~~ The list of platforms we support, and the people responsible for them, is here: http://hackage.haskell.org/trac/ghc/wiki/Contributors Ports to other platforms are possible with varying degrees of difficulty. The Building Guide describes how to go about porting to a new platform: http://hackage.haskell.org/trac/ghc/wiki/Building Developers ~~~~~~~~~~ We welcome new contributors. Instructions on accessing our source code repository, and getting started with hacking on GHC, are available from the GHC's developer's site run by Trac: http://hackage.haskell.org/trac/ghc/ Mailing lists ~~~~~~~~~~~~~ We run mailing lists for GHC users and bug reports; to subscribe, use the web interfaces at http://www.haskell.org/mailman/listinfo/glasgow-haskell-users http://www.haskell.org/mailman/listinfo/glasgow-haskell-bugs There are several other haskell and ghc-related mailing lists on www.haskell.org; for the full list, see http://www.haskell.org/mailman/listinfo/ Some GHC developers hang out on #haskell on IRC, too: http://www.haskell.org/haskellwiki/IRC_channel Please report bugs using our bug tracking system. Instructions on reporting bugs can be found here: http://www.haskell.org/ghc/reportabug

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