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Today's Topics:
1. ANNOUNCE: Haskell Communities and Activities Report (18th
ed., May 2010) (Janis Voigtl?nder)
2. ANNOUNCE : leksah 0.8.0.6 rpms for Fedora 13 now available
(Lakshmi Narasimhan T V)
3. forall confusion (Philip Scott)
----------------------------------------------------------------------
Message: 1
Date: Fri, 28 May 2010 09:32:01 +0200
From: Janis Voigtl?nder <j...@informatik.uni-bonn.de>
Subject: [Haskell-beginners] ANNOUNCE: Haskell Communities and
Activities Report (18th ed., May 2010)
To: beginners@haskell.org
Message-ID: <4bff7171.6060...@informatik.uni-bonn.de>
Content-Type: text/plain; charset=ISO-8859-15; format=flowed
On behalf of the many, many contributors, I am pleased to announce
that the
Haskell Communities and Activities Report
(18th edition, May 2010)
is now available in PDF and HTML formats:
http://haskell.org/communities/05-2010/report.pdf
http://haskell.org/communities/05-2010/html/report.html
Many thanks go to all the people that contributed to this report,
both directly, by sending in descriptions, and indirectly, by doing
all the interesting things that are reported. I hope you will find
it as interesting a read as I did.
If you have not encountered the Haskell Communities and Activities
Reports before, you may like to know that the first of these reports
was published in November 2001. Their goal is to improve the
communication between the increasingly diverse groups, projects, and
individuals working on, with, or inspired by Haskell. The idea behind
these reports is simple:
Every six months, a call goes out to all of you enjoying Haskell to
contribute brief summaries of your own area of work. Many of you
respond (eagerly, unprompted, and sometimes in time for the actual
deadline ;-) to the call. The editor collects all the contributions
into a single report and feeds that back to the community.
When I try for the next update, six months from now, you might want
to report on your own work, project, research area or group as well.
So, please put the following into your diaries now:
----------------------------------------
End of October 2010:
target deadline for contributions to the
November 2010 edition of the HC&A Report
----------------------------------------
Unfortunately, many Haskellers working on interesting projects are so
busy with their work that they seem to have lost the time to follow
the Haskell related mailing lists and newsgroups, and have trouble even
finding time to report on their work. If you are a member, user or
friend of a project so burdened, please find someone willing to make
time to report and ask them to "register" with the editor for a simple
e-mail reminder in October (you could point me to them as well, and I
can then politely ask if they want to contribute, but it might work
better if you do the initial asking). Of course, they will still have to
find the ten to fifteen minutes to draw up their report, but maybe we
can increase our coverage of all that is going on in the community.
Feel free to circulate this announcement further in order to
reach people who might otherwise not see it. Enjoy!
Janis Voigtlaender
<hcar at haskell.org>
------------------------------
Message: 2
Date: Sat, 29 May 2010 00:20:57 +0530
From: Lakshmi Narasimhan T V <lakshminaras2...@gmail.com>
Subject: [Haskell-beginners] ANNOUNCE : leksah 0.8.0.6 rpms for Fedora
13 now available
To: Beginners@haskell.org
Message-ID:
<aanlktim5odtczvmf_1gz7-ymvpiamdfoenivi5bjm...@mail.gmail.com>
Content-Type: text/plain; charset="utf-8"
Hello,
Following the official release of Leksah 0.8, rpms for Fedora 12 and Fedora
13 platforms are now available..
Before proceeding to install, remove any previous installations of leksah
done via yum using the following
command
yum remove leksah leksah-server
*Instructions for Fedora 12*
*For x86*
http://sites.google.com/site/lakshminaras2002/home/leksah-server-0.8.0.6-1.fc12.i386.rpm?attredirects=0&d=1
http://sites.google.com/site/lakshminaras2002/home/leksah-0.8.0.6-1.fc12.i386.rpm?attredirects=0&d=1
To install, use the following command
yum --nogpgcheck install leksah-server-0.8.0.6-1.fc12.i386.rpm
leksah-0.8.0.6-1.fc12.i386.rpm
*For x86_64*
http://sites.google.com/site/lakshminaras2002/home/leksah-server-0.8.0.6-1.fc12.x86_64.rpm?attredirects=0&d=1
http://sites.google.com/site/lakshminaras2002/home/leksah-0.8.0.6-1.fc12.x86_64.rpm?attredirects=0&d=1
To install, use the following command
yum --nogpgcheck install leksah-server-0.8.0.6-1.fc12.x86_64.rpm
leksah-0.8.0.6-1.fc12.x86_64.rpm
--------------------------------------------------------------------------------------------------------------------------------------------------
*Instructions for Fedora 13*
*For x86*
http://sites.google.com/site/lakshminaras2002/home/leksah-0.8.0.6-1.f13.i686.rpm?attredirects=0&d=1
http://sites.google.com/site/lakshminaras2002/home/leksah-server-0.8.0.6-1.f13.i686.rpm?attredirects=0&d=1
To install, use the following command
yum --nogpgcheck install leksah-0.8.0.6-1.f13.i686.rpm
leksah-server-0.8.0.6-1.f13.i686.rpm
*For x86_64*
http://sites.google.com/site/lakshminaras2002/home/leksah-server-0.8.0.6-1.f13.x86_64.rpm?attredirects=0&d=1
http://sites.google.com/site/lakshminaras2002/home/leksah-0.8.0.6-1.f13.x86_64.rpm?attredirects=0&d=1
To install, use the following command
yum --nogpgcheck install leksah-0.8.0.6-1.f13.x86_64.rpm
leksah-server-0.8.0.6-1.f13.x86_64.rpm
Thanks,
--
Regards
Lakshmi Narasimhan T V
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------------------------------
Message: 3
Date: Sat, 29 May 2010 16:35:42 +0100
From: Philip Scott <haskell-beginn...@foo.me.uk>
Subject: [Haskell-beginners] forall confusion
To: Beginners@haskell.org
Message-ID: <4c01344e.2070...@foo.me.uk>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Hi all,
I was wondering if someone could give me an intuitive explanation of why in
f :: forall a.(Show a) => a -> String
f x = show x
"forall a.(Show a) => a" appears to translate into "Any a, as long as it
is an instance of Show"
but if I use forall in an type qualifier in an assignment:
myList = [] :: [forall a.(Show a) => a]
"forall a.(Show a) => a" seems to mean "Any a, as long as it is bottom"
I've been poring over
http://en.wikibooks.org/wiki/Haskell/Existentially_quantified_types
for the last hour and I feel like my eyes are starting to melt.
As usual, any input would be warmly received :)
All the best,
Philip
------------------------------
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