[Haskell] Haskell Weekly News: October 31, 2006
Donald Bruce Stewart
dons at cse.unsw.edu.au
Mon Oct 30 21:08:55 EST 2006
Haskell Weekly News
Issue 47 - October 31, 2006
Welcome to issue 47 of HWN, a weekly newsletter covering developments
in the Haskell community.
This week we see a number of community documentation and maintenance
efforts, and the appearance of indexed data types in GHC
* Associated data types in GHC. Manuel Chakravarty announced the
availability of indexed data types, an extension of our earlier
proposal for associated data types, in GHC's development
version. Detailed information on where to get the right GHC and
how to use indexed types is available from the Haskell wiki.
* Yhc Bytecode library 0.3. Robert Dockins announced the release
of the Yhc Bytecode library, version 0.3.
* Haskell Program Coverage. Andy Gill checked the latest version
of HPC, with GHC support, into the head GHC branch
* Haskell Mersenne Twister. Lennart Augustsson made available his
Haskell implementation of the Mersenne Twister random number
* Haskell-specific Google Search Engine. Don Stewart initialised
a Haskell-specific search engine, as part of Google's coop engine
system, which seems to do a good job of targeting just Haskell
sites, in particular, mailing list items
* A process for submitting library extensions. The libraries hackers
have developed a document describing how to best go about
contributing new code to the core Haskell libraries. On a similar
note, the GHC team has prepared a page on best practice for
* How to create a Haskell project. Don Stewart and Ian Lynagh
prepared some guidelines on starting your own Haskell project.
This section covers the Haskell' standardisation process.
* Lambda-match vs PMC
* Indentation of If-Then-Else
* Digit groups
* Haskell Quiz/Ruby Quiz. Haskell Hackers have started recording
Ruby Quiz solutions on the Haskell wiki. Lots of fun puzzles are
available, and its a useful resource if you're learning the
* Infinite, open, statically constrained HLists. Oleg Kiselyov
described heterogeneous sequences that admit infinite
sequences and permits post-hoc addition of new elements, even to
an already infinite sequence.
* Lexically scoped type variables: new proposal. Ben Rudiak-Gould
made a new for scoped type variables.
* Simple GADT parser for the eval example. Greg Buchholz sought
advice on creating evaluators with GADTs
* Package mounting. Frederik Eaton proposed an alternative
design for package mounting extensions to the package system.
* Function types as instances of Num. Greg Buchholz had an
interesting problem using functions as instances of Num
* Yhc Core file generation. Neil Mitchell suggested that it was
time to start taking YHC Core output a bit more seriously, and
made some proposals.
* Parallelism in GHC 6.6 and seq vs. pseq. Simon Marlow noticed
that Control.Parallel exports seq when in fact it should probably
* Lectureships in Software Engineering. Jeremy Gibbons announced
that applications are invited for three new University
Lectureships in Software Engineering, at the University of Oxford.
For further information, including full details of the application
procedure and selection criteria, see here.
Haskell news from the blogosphere.
* Developing Gnome Apps with Glade
* The Fun of Functional Infrastructure
* Lightweight Threads
* Fold diagrams
* Haskell and Scheme: Which One and Why?
* Scheme Death Knell?
* Software Cipher
* Algebraic Topology in Haskell
* Syntax extension for Monads in Ocaml
* The wxhaskell revival
* Query Composition using Functional Programming Techniques in C# 3.0
* Practical Haskell?
* FP publisher interview
* Haskell mentions at the Dynamic Languages Symposium
* Phil Wadler (aka Lambda Man) at OOPSLA
* Haskell programming
* RushCheck, a lightweight random testing tool for Ruby similar to QuickCheck
Quotes of the Week
* Simon Marlow: In fact, you don't need an evil scheduler, an
ordinary scheduler will do this.
* Conor McBride: My operating hypothesis is that even ordinary
schedulers are evil...
* Larry Wall: Continuations - if you know what they are - I don't
need to explain them. If you don't know what they are - you don't
want to know.
* Cale: [discussing names for Haskell, after suggesting Sapphire]
Diamond: The Hardest Programming Language on Earth
* ConorMcBride: So, taking Void to be the colour of the empty
* cjeris: I like how you conveniently gloss over the part where your
* dons: C++: Creating blub programmers since 1985
* mwc: I can only believe that Java is a conspiracy perpetrated by
* Pseudonym: (:) looks like a ninja robot pirate monkey
* chessguy: We've got satan and beelsebob in here, and talking about
unicycling.... this channel is guaranteed to be a bad influence on
* dons: fold (\water dish -> wash water dish) soapywater dishes
* masklinn: Scheme, on the other hand, is dynamically compiled and
thus doesn't 'fail early', it fails as late as it can, which
produces weird error unless you're into testing. Beginners never
are into testing.
* Riastradh: Assume that I haven't the faintest idea of what a
comonad is, beyond that if a monad goes `voob', then a comonad
* Anonymous: It is quite possible that 'the ultimate teaching
language' was not actually invented when Steele and Sussman came
down from the mountain bearing a spool of 9-track magtape...
* sigfpe: How can Haskell not be the programming language that all
mathematicians should learn?
* Syzygy: > let _'__'_'''_'__'_=2 in _'__'_'''_'__'_
* ihope>: > let _' __ ___ (____:_____) = __ ____ (_' __ ___ _____);
_' _ __  = __ in _' (+) 0
* Syzygy: one thing that stands out is the relatively low distance
between thought expressed in my ordinary day-to-day mathematical
discourse, and thought expressed in Haskell code
* Tue Oct 24 14:29:07 PDT 2006. Andy Gill. Haskell Program Coverage.
This large checkin is the new ghc version of Haskell Program
Coverage, an expression-level coverage tool for Haskell. You can
run the coverage tool with -fhpc at compile time. Main must be
compiled with -fhpc.
* Tue Oct 24 02:13:57 PDT 2006. Simon Marlow. Split GC.c, and move
storage manager into sm/ directory. In preparation for parallel
GC, split up the monolithic GC.c file into smaller part
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