April 2016 - Haskell-Cafe

SBLP 2016 Deadline Extension
by Simon Thompson 09 Apr '16

09 Apr '16

We'd like to let you know that, due to multiple requests, we have extended the deadline for both abstract and paper submissions to SBLP. The new dates are the following: Abstract submission (extended!): April 22nd 2016 Paper submission (extended!): April 29th 2016 Author notification: June 10th 2016 Camera ready deadline: June 24th 2016 Please distribute the attached call for papers (with the extended deadlines) wherever you may find appropriate. Do not hesitate to contact us if you have any questions. Kind regards, Fernando Castor Yu David Liu The Brazilian Symposium on Programming Languages is a well-established symposium which provides a venue for researchers and practitioners interested in the fundamental principles and innovations in the design and implementation of programming languages and systems. SBLP 2016 will be held in Maringá, in the Southern region of Brazil, and will be the 20th edition of the symposium. SBLP is part of the 7th edition of CBSoft, the Brazilian Congress on Software: Theory and Practice. More information is available at http://cbsoft.org/sblp2016/xx-brazilian-symposium-on-programming-languages. IMPORTANT DATES Abstract submission: April 22nd 2016 Paper submission: April 29th 2016 Author notification: June 10th 2016 Camera ready deadline: June 24th 2016 Symposium dates: September 22nd and 23rd Authors are invited to submit original research on any relevant topic which can be either in the form of regular or short papers. TOPICS Topics of interest include, but are not limited to: - Program generation and transformation, including domain-specific languages, and model-driven development in the context of programming languages. - Programming paradigms and styles, including functional, object-oriented, aspect-oriented, scripting languages, real-time, service-oriented, multithreaded, parallel, and distributed programming. - Formal semantics and theoretical foundations, including denotational, operational, algebraic, and categorical. - Program analysis and verification, including type systems, static analysis, and abstract interpretation. - Programming language design and implementation, including new programming models, programming language environments, compilation, and interpretation techniques. SUBMISSION AND PUBLICATION All submissions will be peer-reviewed and judged on the basis of its originality, contribution to the field, technical and presentation quality, and relevance to the symposium. Contributions should be written in Portuguese or English. Papers should fall into one of two different categories: regular papers, which can be up to 15 pages long in LNCS format, or short papers, with up to 6 pages in LNCS format. Short papers can discuss new ideas which are at an early stage of development and which have not yet been thoroughly evaluated. We encourage the submission of short papers reporting partial results of on-going master dissertations or doctoral theses. Accepted papers written in English will be published in a volume of Lecture Notes in Computer Science (LNCS), by Springer. Both regular and short papers must be prepared using the LNCS format, available at http://www.springer.com/computer/lncs?SGWID=0-164-6-793341-0. Papers must be submitted electronically (in PDF format) via the Easychair System: http://www.easychair.org/conferences/?conf=sblp2016. As in previous editions, after the conference, authors of selected regular papers will be invited to submit an extended version of their work to be considered for publication in a journal special issue. Since 2009, selected papers of each SBPL edition are being published in a special issue of Science of Computer Programming, by Elsevier. PROGRAM CHAIRS Fernando Castor, Federal University of Pernambuco Yu David Liu, State University of New York, Binghamton PROGRAM COMMITTEE Luis Barbosa, University of Minho Thiago Tonelli Bartolomei, LogicBlox Mariza Bigonha, Federal University of Minas Gerais Roberto Bigonha, Federal University of Minas Gerais Andre Rauber Du Bois, Federal University of Pelotas Christiano Braga, Fluminense Federal University Carlos Camarão, Federal University of Minas Gerais Francisco Carvalho-Junior, Federal University of Ceara Fernando Castor, Federal University of Pernambuco Marcelo D'Amorim, Federal University of Pernambuco João Paulo Fernandes, University of Beira Interior João Ferreira, Teesside University Lucilia Figueiredo, Federal University of Ouro Preto Ismael Figueroa, Pontificia Universidad Católica de Valparaiso Alex Garcia, IME Rodrigo Geraldo, Federal University of Ouro Preto Roberto Ierusalimschy, PUC-Rio Rafael Lins, Federal University of Pernambuco Yu David Liu, State University of New York at Binghamton Hans-Wolfgang Loidl, Heriot-Watt University Marcelo Maia, Federal University of Uberlândia Manuel-A. Martins, University of Aveiro Fabio Mascarenhas, Federal University of Rio de Janeiro Sérgio Medeiros, Federal University of Rio Grande do Norte Ana Milanova, Rensselaer Polytechnic Institute Alvaro Moreira, Federal University of Rio Grande do Sul Martin Musicante, Federal University of Rio Grande do Norte Bruno Oliveira, The University of Hong Kong Zachary Palmer, Swarthmore College Alberto Pardo, Universidad de la República Fernando Pereira, Federal University of Minas Gerais Gustavo Pinto, Federal Institute of Science and Technology of Para Louis-Noel Pouchet, University of California Zongyan Qiu, Peking University Sandro Rigo, State University of Campinas Noemi Rodriguez, PUC-Rio João Saraiva, University of Minho Doaitse Swierstra, Utrecht University Leopoldo Teixeira, Federal University of Pernambuco Simon Thompson, University of Kent Varmo Vene, University of Tartu

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Extending Compiler With Authorized Types
by Jonn Mostovoy 08 Apr '16

08 Apr '16

Dear friends, we are thinking about implementing the paper Authenticated Data Structures, Generically[1], but we did not have any prior experience with extending Haskell. We are informed about compiler plugins[2] and hope that writing a compiler plugin will be enough to provide machinery required by the paper, but we are not sure about it. If anyone has an opinion on bringing Authenticated Data Structures to Haskell, please share. If there is some interest in our work, we will keep you up to date in this thread. - - - References: [1]: http://f.nn.lv/o5/a7/yk/GPADS-A_Miller-Authenticated_Data_Structures_Generi… [2]: https://downloads.haskell.org/~ghc/latest/docs/html/users_guide/compiler-pl… — Kindest regards, Jonn Mostovoy (IOHK / Serokell)

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Text.Regex.matchRegex: Success is empty?
by Jeffrey Brown 06 Apr '16

06 Apr '16

Esteemed Haskellers, It is working for me, but I am puzzled by the matchRegex function: > import Text.Regex > :i matchRegex matchRegex :: Regex -> String -> Maybe [String] -- Defined in ‘Text.Regex’ Searches that fail return Nothing: > matchRegex (mkRegex "z") "abracadabra" Nothing which makes sense. But why do searches that succeed return an empty list of Strings? > matchRegex (mkRegex "a") "abracadabra" Just [] > -- Jeffrey Benjamin Brown

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accessing the RTS -M flag value from GHC.RTS.Flags
by Adam Flott 06 Apr '16

06 Apr '16

Given, import GHC.RTS.Flags main = do gcf <- getRTSFlags print (maxHeapSize (gcFlags gcf)) And running on x86-64 in GHC 7.10.3, $ ./ghcflags 0 $ ./ghcflags +RTS -M1M 256 $ ./ghcflags +RTS -M1024K 256 $ ./ghcflags +RTS -M4096K 1024 Is there anyway I can get access to the value stored in the -M flag and depend on that value being correct? I was not able find it in the user's guide or anywhere else for that matter. Thanks, Adam

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[ANN] protobuf-simple: Protocol Buffers library
by Martijn Rijkeboer 05 Apr '16

05 Apr '16

Hello, I've just released protobuf-simple, an Haskell implementation of Google's Protocol Buffers with an emphasis on simplicity. This implementation consists of a library for the encoding and decoding of data and an executable for generating Haskell types from proto files. The code can be found at https://github.com/sru-systems/protobuf-simple Kind regards, Martijn Rijkeboer

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Re: [Haskell-cafe] [ANN] protobuf-simple: Protocol Buffers library
by Martijn Rijkeboer 05 Apr '16

05 Apr '16

Hi Alain, > What version of Protocol Buffer are you supporting (I did not find this > info, sorry) ? Are you planning on supporting the V3 if you don't > already? The protobuf-simple library only supports V2. The version wasn't specified anywhere, my bad. I've just added it to the readme. Currently I have no plans supporting V3, since I have no use for it. However, pull requests are always welcome, providing that the library remains "simple". Kind regards, Martijn Rijkeboer

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Journal of Functional Programming - Call for PhD Abstracts
by Graham Hutton 05 Apr '16

05 Apr '16

If you or one of your students recently completed a PhD in the area of functional programming, please submit the dissertation abstract for publication in JFP: simple process, no refereeing, deadline 30th April 2016. Best wishes, Graham ============================================================ CALL FOR PHD ABSTRACTS Journal of Functional Programming Deadline: 30th April 2016 http://tinyurl.com/jfp-phd-abstracts ============================================================ PREAMBLE: Many students complete PhDs in functional programming each year. As a service to the community, the Journal of Functional Programming publishes the abstracts from PhD dissertations completed during the previous year. The abstracts are made freely available on the JFP website, i.e. not behind any paywall. They do not require any transfer of copyright, merely a license from the author. A dissertation is eligible for inclusion if parts of it have or could have appeared in JFP, that is, if it is in the general area of functional programming. The abstracts are not reviewed. Please submit dissertation abstracts according to the instructions below. We welcome submissions from both the PhD student and PhD advisor/supervisor although we encourage them to coordinate. ============================================================ SUBMISSION: Please submit the following information to Graham Hutton <graham.hutton(a)nottingham.ac.uk> by 30th April 2016. o Dissertation title: (including any subtitle) o Student: (full name) o Awarding institution: (full name and country) o Date of PhD award: (month and year; depending on the institution, this may be the date of the viva, corrections being approved, graduation ceremony, or otherwise) o Advisor/supervisor: (full names) o Dissertation URL: (please provide a permanently accessible link to the dissertation if you have one, such as to an institutional repository or other public archive; links to personal web pages should be considered a last resort) o Dissertation abstract: (plain text, maximum 1000 words; you may use \emph{...} for emphasis, but we prefer no other markup or formatting in the abstract, but do get in touch if this causes significant problems) Please do not submit a copy of the dissertation itself, as this is not required. JFP reserves the right to decline to publish abstracts that are not deemed appropriate. ============================================================ PHD ABSTRACT EDITOR: Graham Hutton School of Computer Science University of Nottingham Nottingham NG8 1BB United Kingdom ============================================================ This message and any attachment are intended solely for the addressee and may contain confidential information. If you have received this message in error, please send it back to me, and immediately delete it. Please do not use, copy or disclose the information contained in this message or in any attachment. Any views or opinions expressed by the author of this email do not necessarily reflect the views of the University of Nottingham. This message has been checked for viruses but the contents of an attachment may still contain software viruses which could damage your computer system, you are advised to perform your own checks. Email communications with the University of Nottingham may be monitored as permitted by UK legislation.

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Darcs+Pijul Hacking Sprint #11 (May 6th-8th, Helsinki)
by Ganesh Sittampalam 05 Apr '16

05 Apr '16

Dear Hackers, The 11th Darcs Sprint, organised by and jointly with the Pijul team, will be in Helsinki, on Friday May 6th-Sunday May 8th, at Aalto University's startup sauna in the Otaniemi Campus. Please check the details at http://pijul.org/2016/04/02/sprint.html Many thanks to Pierre-Étienne Meunier for organising it. The Darcs planning page is at: http://darcs.net/Sprints/2016-05 Here are three things to know: 1. Everybody is welcome to join us. We'd love to have you, whatever your hacking experience with Pijul or Darcs. Also, if you've got a wacky idea for the future of version control, or a cool use for the Darcs or Pijul libraries, you should join us too. 2. If you're attending please add your name to http://wiki.darcs.net/Sprints/2016-05 3. We may be able to reimburse travel costs (within reason!). Let us know if you'd like a reimbursement, and save your receipts. Many thanks to everybody who participated in our fundraising drives or who gave money on the side. Thanks also to the Software Freedom Conservancy for making fundraising and reimbursements so painless! If you can't join us in person, but you'd like to cheer us on, say hello at http://darcs.net/Donations ! See you next month! Ganesh

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Benchmarking harnesses for a more modern nofib?
by Ryan Newton 05 Apr '16

05 Apr '16

Hi all, Is anyone currently working in, or interested in helping with, a new benchmark suite for Haskell? Perhaps, packaging up existing apps and app benchmarks into a new benchmark suite that gives a broad picture of Haskell application performance today? Background: We run nofib, and we run the shootout benchmarks. But when we want to evaluate basic changes to GHC optimizations or data representation, these really don't give us a full picture of whether a change is beneficial. A few years ago, fibon <https://hackage.haskell.org/package/fibon> tried to gather some Hackage benchmarks. This may work even better with Stackage, where there are 180 benchmark suites among the 1770 packages currently. Also, these days companies are building substantial apps in Hackage. Which substantial apps could or should go into a benchmark suite? I see Warp and other web server benchmarks <http://www.infoq.com/news/2015/04/web-frameworks-benchmark-2015?utm_source=…> all over the web. But is there a harness that can time some of this code while running inside a single-machine, easy-setup benchmark suite? Best, -Ryan

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[ANN] bond-haskell: yet another data serialization library
by Andrey Sverdlichenko 05 Apr '16

05 Apr '16

bond-haskell and bond-haskell-compiler is a pair of packages adding Haskell support to bond serialization framework. Bond is an open source, cross-platform framework for working with schematized data. It supports cross-language serialization/deserialization and powerful generic mechanisms for efficiently manipulating data. It is broadly used at Microsoft in high scale services. For a discussion how Bond compares to similar frameworks (most notably protobufs) see https://microsoft.github.io/bond/why_bond.html Microsoft's bond package or other foreign code is not needed for building or using bond-haskell, all dependencies are published to hackage. For those interested, Microsoft's code is published at https://github.com/Microsoft/bond/

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