May 2005 - Haskell - Haskell.org

June Issue of The Monad.Reader now online - http://www.haskell.org/tmrwiki/IssueThree
by Shae Matijs Erisson 31 May '05

31 May '05

http://www.haskell.org/tmrwiki/IssueThree This month's issue has a definite introductory theme. It includes republished book reviews, notes on learning, a look at the differences between functional and object oriented programming, and distributed computation. As always, The Monad.Reader invites submissions on Haskell and related topics. Send a summary or abstract for your article to shae(a)ScannedInAvian.com As the summer approaches, it's getting harder to find authors. The Monad.Reader is fueled entirely by articles and time contributed by the community. Please contribute! -- It seems I've been living two lives. One life is a self-employed web developer In the other life, I'm shapr, functional programmer. | www.ScannedInAvian.com One of these lives has futures (and subcontinuations!)| --Shae Matijs Erisson

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Call for Participation: GPCE'05 - Generative Programming and Component Engineering
by Eelco Visser 31 May '05

31 May '05

PRELIMINARY CALL for PARTICIPANTS ANNOUNCEMENT of WORKSHOPS and TUTORIALS ---------------------------------------------------------------------- 4th International Conference on Generative Programming and Component Engineering (GPCE'05) Sep 29 - Oct 1, 2005, Tallinn (Estonia) http://www.gpce.org/05 Sponsored by ACM SIGPLAN, in cooperation with ACM SIGSOFT co-located with ICFP'05 and TFP'05 ---------------------------------------------------------------------- Consult http://www.gpce.org/05 for UP-TO-DATE and DETAILED information especially the calls for workshop contributions FORTHCOMING: on-line registration should become active in mid June ---------------------------------------------------------------------- IMPORTANT DATES * Jun 13, 2005: suggested deadline for workshop contributions (please check on workshop web pages for details) * Jul 29, 2005: EARLY REGISTRATION DEADLINE * Sep 27-28, 2005: GPCE workshops and tutorials * Sep 29 - Oct 1, 2005: GPCE papers and demos ---------------------------------------------------------------------- SCOPE. Generative and component approaches have the potential to revolutionize software development in a similar way as automation and components revolutionized manufacturing. Generative Programming (developing programs that synthesize other programs), Component Engineering (raising the level of modularization and analysis in application design), and Domain-Specific Languages (elevating program specifications to compact domain-specific notations that are easier to write and maintain) are key technologies for automating program development. GPCE arose as a joint conference, merging the conference on Generative and Component-Based Software Engineering (GCSE) and the workshop on Semantics, Applications, and Implementation of Program Generation (SAIG). The goal of GPCE is to provide a meeting place for researchers and practitioners interested in cutting edge approaches to software development. We aim to foster further cross-fertilization between the software engineering research community and the programming languages community, in addition to supporting the original research goals of both the GCSE and the SAIG communities. ---------------------------------------------------------------------- 3 INVITED SPEAKERS: * Oscar Nierstrasz: Object-oriented reengineering patterns * Oege de Moor: TBA * Bernd Fischer: Certifiable generative programming 25 TECHNICAL PAPERS (see conference web page for the list of accepted papers) 2 DEMONSTRATIONS: * Developing Dynamic and Adaptable Applications with CAM/DAOP: a Virtual Office Application * Metamodeling made easy - MetaEdit+ 3 TUTORIALS T1: Multi-stage Programming in MetaOCaml (Presenters: W.Taha, C.Calcagno) T2: Implementing Domain-Specific Modelling Languages and Generators (Presenters: R.Pohjonen and J-P.Tolvanen) T3: Challenges and Best Practices of Generative Software Engineering in the Context of Large Complex Business Applications (Presenter: M.M.Davydov) 3 WORKSHOPS W1: Seventh Young Researchers Workshop (Organizers: D.R.Dechow, D.Foetsch, S.Kiebusch, S.Perugini, M.J.Rutherford, D.Shestakov) W2: Second MetaOCaml Workshop (Organizers: K.Swadi, W.Taha) W3: Graph and Model Transformations Workshop (Organizers: G.Karsai, G.Taentzer) ---------------------------------------------------------------------- PROGRAM COMMITTEE Chairs: * Robert Glück (U. of Copenhagen) * Michael Lowry (NASA) Members: * Don Batory (U. of Texas, USA) * Ira Baxter (Semantic Designs) * Cristiano Calcagno (Imperial College) * Prem Devanbu (U. of California at Davis) * Ulrich Eisenecker (U. of Leipzig) * Tom Ellman (Vassar College) * Robert Filman (NASA) * Zhenjiang Hu (U. of Tokyo) * Patricia Johann (Rutgers U.) * John Launchbury (Galois) * Anne-Françoise Le Meur (U. of Sci. and Tech. Lille) * Hong Mei (Peking U.) * Nicolas Rouquette (NASA) * William Scherlis (CMU) * Yannis Smaragdakis (Georgia Inst. of Tech.) * Walid Taha (Rice U.) * Todd Veldhuizen (Chalmers U. of Tech.) ORGANIZING COMMITTEE General Chair * Eugenio Moggi (Genova U.) Publicity Chair: * Eelco Visser (Utrecht U.) Workshops and Tutorials Chairs * Jeff Gray (U. of Alabama at Birmingham) * Andrew Malton (Waterloo U.) Local Arrangements Chair * Tarmo Uustalu (Inst. of Cybernetics, Tallinn) ----------------------------------------------------------------------

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Haskell workshop 2005: final call for papers
by Daan Leijen 30 May '05

30 May '05

Final call for papers, with still two working weeks to go: 2005 Haskell Workshop Tallinn, Estonia, 30 September, 2005 http://www.cs.uu.nl/~daan/hw2005 Final Call for papers -- Important Dates --------------------------------------------------- Submission deadline : June 10 Acceptance notification: July 5 Final version due : July 19 Haskell workshop : September 30 -- The Haskell Workshop ---------------------------------------------- The Haskell Workshop 2005 is an ACM SIGPLAN sponsored workshop affiliated with the 2005 International Conference on Functional Programming (ICFP). Previous Haskell Workshops have been held in La Jolla (1995), Amsterdam (1997), Paris (1999), Montreal (2000), Firenze (2001), Pittsburgh (2002), Uppsala (2003), and Snowbird (2004). -- Scope ------------------------------------------------------------- The purpose of the Haskell Workshop is to discuss experience with Haskell, and future developments for the language. The scope of the workshop includes all aspects of the design, semantics, theory, application, implementation, and teaching of Haskell. Topics of interest include, but are not limited to, the following: * Language Design, with a focus on possible extensions and modifications of Haskell as well as critical discussions of the status quo; * Theory, in the form of a formal treatment of the semantics of the present language or future extensions, type systems, and foundations for program analysis and transformation; * Implementations, including program analysis and transformation, static and dynamic compilation for sequential, parallel, and distributed architectures, memory management as well as foreign function and component interfaces; * Tools, in the form of profilers, tracers, debuggers, pre-processors, and so forth; * Applications, Practice, and Experience, with Haskell for scientific and symbolic computing, database, multimedia and Web applications, and so forth as well as general experience with Haskell in education and industry; * Functional Pearls, being elegant, instructive examples of using Haskell. Papers in the latter two categories need not necessarily report original research results; they may instead, for example, report practical experience that will be useful to others, re-usable programming idioms, or elegant new ways of approaching a problem. The key criterion for such a paper is that it makes a contribution from which other practitioners can benefit. It is not enough simply to describe a program! If there is sufficient demand, we will try to organise a time slot for system or tool demonstrations. If you are interested in demonstrating a Haskell related tool or application, please send a brief demo proposal to the program chair (daan(a)cs.uu.nl) -- Submissions ------------------------------------------------------- Authors should submit papers in postscript or portable document format (pdf), formatted for A4 paper, to Daan Leijen (daan(a)cs.uu.nl) The length should be restricted to 12 pages in standard ACM SIG proceedings format. In particular, LaTeX users should use the most recent sigplan proceedings style available from the Haskell workshop web-site. Furthermore, the "abbrv" style should be used for the bibliography. Accepted papers are published by the ACM and appear in the ACM digital library. Each paper should explain its contributions in both general and technical terms, clearly identifying what has been accomplished, explaining why it is significant, and comparing it with previous work. Authors should strive to make the technical content of their papers understandable to a broad audience. -- Program committee ------------------------------------------------- Martin Erwig Oregon State University John Hughes Chalmers University of Technology Mark Jones OGI School of Science and Engineering at OHSU Ralf Lämmel Microsoft Corp. Daan Leijen Universiteit Utrecht (Program Chair) Andres Löh Universiteit Utrecht Andrew Moran Galois Connections Inc. Simon Thompson University of Kent Malcolm Wallace University of York

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PPrint license
by Samuel Bronson 30 May '05

30 May '05

I was messing around with some pretty printing stuff in Pugs, and I got tired of Text.PrettyPrint.HughesPJ, and wound up wanting to use PPrint. But I don't see any license anywhere for it, so I'm naturally a bit hessitant to stick it in the Pugs svn tree... Anybody know anything about this? -- thanks, Sam

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The 17th Nordic Workshop on Programming Theory (NWPT'05)
by jespera＠diku.dk 30 May '05

30 May '05

PRELIMINARY ANNOUNCEMENT AND CALL FOR PAPERS The 17th Nordic Workshop on Programming Theory (NWPT'05) http://www.diku.dk/NWPT05/ 19-21 October, 2005, Copenhagen, Denmark The NWPT series of annual workshops is a forum bringing together programming theorists from the Nordic and Baltic countries (but also elsewhere). The previous workshops were held in Uppsala (1989, 1999 and 2004), Aalborg (1990), Gothenburg (1991 and 1995), Bergen (1992 and 2000), Turku (1993, 1998, and 2003), Aarhus (1994), Oslo (1996), Tallinn (1997 and 2002), Lyngby (2001). This time the workshop will be held in Copenhagen. Scope Typical topics of the workshop include (but are not limited to): " Semantics of programs " Programming logics " Program verification " Formal specification of programs " Program synthesis " Program transformation and program refinement " Real-Time and hybrid systems " Modeling of concurrency " Programming methods " Tools for program construction and verification SUBMISSIONS Authors wishing to give a talk at the workshop are requested to submit an abstract of 1-3 pages (ps or pdf, printable on A4 paper) to nwpt05(at)diku.dk by 19th September 2005. Submission of work submitted for formal publication elsewhere and work in progress is permitted. The abstracts of the accepted contributions will be available at the workshop. After the workshop, selected papers will be published in a special issue of Nordic Journal of Computing. Important Dates (tentative) 19. September: Submission of abstracts 5. October: Notification of acceptance 3. October: Registration 19-21October: WORKSHOP ORGANISING COMMITTEE Neil Jones, Jesper Andersen,... nwpt05(at)diku.dk More (and more current) information is available at http://www.diku.dk/NWPT05/ A short history of the workshop is available at http://www.cc.ioc.ee/nwpt02/history.html

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signification of RWS and RWST
by Wolfgang Jeltsch 30 May '05

30 May '05

Hello, why do we have RWS and RWST in the libaries? Isn't RWS r w s a isomorphic to ReaderT r (StateT s (Writer w a)) and RWST r w s m isomorphic to ReaderT r (StateT s (WriterT w m a))? Best wishes, Wolfgang

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simple MonadWriter instance
by Wolfgang Jeltsch 30 May '05

30 May '05

Hello, there is an instance MonadReader r ((->) r). Why isn't there an instance MonadWriter w ((,) w)? Best wishes, Wolfgang

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new monad library
by Wolfgang Jeltsch 30 May '05

30 May '05

By the way, wasn't there some effort to build a new monad library which should replace most of the things under Control.Monad? Best wishes, Wolfgang

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standard monads and strictness
by Wolfgang Jeltsch 30 May '05

30 May '05

Hello, I looked at the implementation of Writer, WriterT, State, StateT, RWS and RWST. They all use tuples to knit the result with the written value and/or state. Now, there seems to be an inconsistency between the transformer and non-transformer variants concerning strictness. The non-transformer variants (Writer, State and RWS) use let binding to extract the tuple components while the transformer variants use pattern matching in do expressions. So the expression evalState (undefined >> return ()) () yields () while evalStateT (undefined >> return ()) () yields _|_ for any inner monad. Is there any good reason for this behaviour? Since the tuples are only used for knitting together several values, the most logical solution would be to use unboxed tuples in all of the above cases, in my opinion. If this is not feasible, we probably should use lazy pattern matching with the transformer versions. Best wishes, Wolfgang

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error rebuilding ghc-6.4
by vadim 30 May '05

30 May '05

Dear all, when trying to rebuild ghc-6.4 from source, I fall into following error: ........ gcc -O -I../../includes -Wall -c Shade.c -o Shade.o gcc -O -I../../includes -Wall -c TopTwenty.c -o TopTwenty.o gcc -O -I../../includes -Wall -c TraceElement.c -o TraceElement.o gcc -O -I../../includes -Wall -c Utilities.c -o Utilities.o gcc -o hp2ps -O -I../../includes -Wall AreaBelow.o AuxFile.o Axes.o Curves.o Deviation.o DimensiDeviation.o(.text+0x316): In function `Deviation': : undefined reference to `sqrt' collect2: ld returned 1 exit status make[3]: *** [hp2ps] Error 1 make[2]: *** [all] Error 1 make[1]: *** [all] Error 1 make[1]: Leaving directory `/root/build/ghc-6.4/ghc' make: *** [build] Error 1 When building, I followed recommendations from http://www.haskell.org/ghc/docs/latest/html/building/sec-building-from-sour… That said, I did: autoreconf ./configure --prefix=/opt/ghc64 make My OS is Linux, kernel 2.6.9 GCC version is 3.3.2 Perl version is 5.8.3 Could you please advice? Thanks in advance, Vadim.

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