Hi,
You can easily do this using the haskell-names library. See
http://documentup.com/haskell-suite/haskell-names
Roman
* Jong-won Choi oz.jongwon.c...@gmail.com [2013-08-08 12:34:44+1000]
Hi,
I asked this question to beginner mailing list and no luck so far, so
I'm trying here.
How can
On Mon, Aug 05, 2013 at 09:48:39PM +0300, Roman Cheplyaka wrote:
I am pleased to announce the first release of tasty, a new testing
framework for Haskell. It is meant to be a successor to
test-framework (which is unmaintained).
Tasty supports HUnit, SmallCheck, QuickCheck, and golden tests
* Magnus Therning mag...@therning.org [2013-08-08 07:59:37+0200]
On Mon, Aug 05, 2013 at 09:48:39PM +0300, Roman Cheplyaka wrote:
I am pleased to announce the first release of tasty, a new testing
framework for Haskell. It is meant to be a successor to
test-framework (which is
HiIs it reasonable to consider a Haskell class as a loose signature-only-specification (denoting a theory) and an instance as an implementation (denoting a model)?In the example below the specification of the class BUILDING is textually smaller than the specification of the class HOUSE,provided we
On Wed, 7 Aug 2013, Edward Z. Yang wrote:
I am pleased to announce that Issue 22 of the Monad Reader is now available.
http://themonadreader.files.wordpress.com/2013/08/issue22.pdf
Issue 22 consists of the following two articles:
* Generalized Algebraic Data Types in Haskell by Anton
And yet others who believe the Axiom of Choice is flawed?
On 8 Aug 2013, at 09:04, Henning Thielemann lemm...@henning-thielemann.de
wrote:
On Wed, 7 Aug 2013, Edward Z. Yang wrote:
I am pleased to announce that Issue 22 of the Monad Reader is now available.
On Thu, Aug 08, 2013 at 01:19:27AM +0200, Jerzy Karczmarczuk wrote:
Bardur Arantsson comments the comment of Joe Quinn:
On 8/7/2013 11:00 AM, David Thomas wrote:
twice :: IO () - IO ()
twice x = x x
I would call that evaluating x twice (incidentally creating two
separate evaluations of
AntC anthony_clay...@clear.net.nz writes:
No! This isn't more bikeshedding about notation.
It's a bit of Haskell archaeology.
On Sun, Jun 30, 2013 at 2:59 AM, Judah Jacobson wrote:
[This isn't exactly what Judah wrote.]
...
Instead of `x f` (to access field x of record f),
maybe we
Tom Ellis:
If I were writing a Haskell compiler I could certainly define 'IO' to be a
datatype that would allow me to compare 'putStr c' to itself. The
comparison could not be of operational equivalence, but it would still be
possible to compare values in IO in a reasonable sense.
Would you
On Thu, Aug 08, 2013 at 11:38:08AM +0200, Jerzy Karczmarczuk wrote:
Tom Ellis:
If I were writing a Haskell compiler I could certainly define 'IO' to be a
datatype that would allow me to compare 'putStr c' to itself. The
comparison could not be of operational equivalence, but it would still be
I don't know what the denotation for this would be, but I can't think of
any reasonable ones for which I can write (==) to respect the denotation.
For example, is set A, then set B equal to set B, then set A? Maybe you
could argue that they aren't operationally equivalent, but can you
guarantee
Hi, Café!
I have a proposal. I offer to add a new function to the MonadError type
class:
finallyError :: MonadError e m = m a - m b - m a
This is a generalization of the standard finally function that has the
following signature:
finally: IO a - IO b - IO a
Like function finally, the
On Thu, Aug 08, 2013 at 08:41:25AM -0400, Jake McArthur wrote:
I don't know what the denotation for this would be, but I can't think of
any reasonable ones for which I can write (==) to respect the denotation.
For example, is set A, then set B equal to set B, then set A?
[...]
I'm a bit lost
* Eduardo Sato eduardo.s...@gmail.com [2013-08-07 14:46:02-0300]
Hello, guys. Has anybody tried to install wxhaskell on Snow Leopard?
I followed these instructions:
http://www.haskell.org/haskellwiki/WxHaskell/Mac , but got an error:
I am sorry for having mixed-up arguments (but who throws the first
stone?...)
Jerzy seemed to suggest that the impurity of IO was somehow related to it
not supporting very many operations.
No, not really. I added
First, it is not true that you can do with, say, (printStr Ho! )
whatever you
Roman, thanks.
I've managed to install wxHaskell. Someone has already patched it like just you
said: https://github.com/wxHaskell/wxHaskell
The sample programs compile and work fine now.
The only problem now is that I want to distribute a wxHaskell application on
mac OS X. I tried using
On Wed, 07 Aug 2013 19:46:02 +0200, Eduardo Sato eduardo.s...@gmail.com
wrote:
Hello, guys. Has anybody tried to install wxhaskell on Snow Leopard?
I followed these instructions:
http://www.haskell.org/haskellwiki/WxHaskell/Mac , but got an error:
Try installing the latest version,
I've started using BasicPrelude with -XNoImplicitPrelude in all of my
code. It imports all of those and some other stuff as well (text related
functions). Cuts down on my imports by a little over half. Kind of wish
it could be made the default.
On Wed, Aug 7, 2013 at 10:23 PM, aditya bhargava
On Thu, 08 Aug 2013 15:54:13 +0200, Eduardo Sato eduardo.s...@gmail.com
wrote:
Roman, thanks.
I've managed to install wxHaskell. Someone has already patched it like
just you said: https://github.com/wxHaskell/wxHaskell
The sample programs compile and work fine now.
The only problem now
On Thu, Aug 8, 2013 at 9:54 AM, Eduardo Sato eduardo.s...@gmail.com wrote:
The only problem now is that I want to distribute a wxHaskell application
on mac OS X. I tried using macosx-app and cabal-macosx (
https://github.com/michaelt/cabal-macosx) to make an app file. It runs
fine on my
==
FARM 2013: Call for Participation
ACM SIGPLAN Workshop on Functional Art, Music, Modeling and Design
Boston, Massachusetts, USA
28th September, 2013 (directly after ICFP)
On Thu, Aug 08, 2013 at 03:38:41PM +0200, Jerzy Karczmarczuk wrote:
One could simply implement IO as a free monad
Interesting. I wonder how.
See [1] for an explanation of free monads in general. For IO in particular,
define a functor
data IOF a = GetChar (Char - a) | PutChar Char a | ...
Would it be necessary to change Info.plist?
It would be nice being able to distribute haskell apps in general, not only
wxHaskell apps. One can certainly write the UI in C++/Objective C, or what have
you, and use FFI to call haskell libraries. But I am also interested in writing
an app 100% in
Hi folks,
In GHC 7.6.3, the base Data.HashTable is deprecated, so I installed the
hashtables package. In order to work on your datatype, you need an instance
of Data.Hashable.Hashable.
So I went to the Data.Hashable page and looked up examples on how to derive
a Hashable instance for my
On 08/08/2013 05:05 PM, Tom Ellis wrote:
On Thu, Aug 08, 2013 at 03:38:41PM +0200, Jerzy Karczmarczuk wrote:
One could simply implement IO as a free monad
Interesting. I wonder how.
See [1] for an explanation of free monads in general
You're lacking a matching definition of [1] :)
Hi Tom,
See [1] for an explanation of free monads in general. For IO in particular,
define a functor
data IOF a = GetChar (Char - a) | PutChar Char a | ...
with constructors for all elementary IO operations.
But how should this work if the user adds an IO operation, e.g by wrapping
On Thu, Aug 08, 2013 at 05:23:50PM +0100, Oliver Charles wrote:
On 08/08/2013 05:05 PM, Tom Ellis wrote:
On Thu, Aug 08, 2013 at 03:38:41PM +0200, Jerzy Karczmarczuk wrote:
One could simply implement IO as a free monad
Interesting. I wonder how.
See [1] for an explanation of free
On Thu, Aug 08, 2013 at 06:25:12PM +0200, Daniel Trstenjak wrote:
See [1] for an explanation of free monads in general. For IO in particular,
define a functor
data IOF a = GetChar (Char - a) | PutChar Char a | ...
with constructors for all elementary IO operations.
But how
On Thu, Aug 08, 2013 at 05:44:11PM +0100, Tom Ellis wrote:
On Thu, Aug 08, 2013 at 06:25:12PM +0200, Daniel Trstenjak wrote:
See [1] for an explanation of free monads in general. For IO in
particular,
define a functor
data IOF a = GetChar (Char - a) | PutChar Char a | ...
On Thu, Aug 8, 2013 at 12:04 PM, Eduardo Sato eduardo.s...@gmail.comwrote:
Would it be necessary to change Info.plist?
I don't believe so; Info.plist is the externally visible interface details,
but these libraries should be hidden inside the app bundle and not visible
outside of it. When the
I'm pleased to announce the hackage release of FunGEn 0.4!
(Actually 0.4.2 as my 0.4 announcement did not reach the mail lists.)
FunGEn (Functional Game Engine) is a BSD-licensed, cross-platform,
OpenGL/GLUT-based, imperative game engine/framework. With very few
dependencies and two example
On Thu, Aug 8, 2013 at 11:05 PM, Tom Ellis
tom-lists-haskell-cafe-2...@jaguarpaw.co.uk wrote:
On Thu, Aug 08, 2013 at 03:38:41PM +0200, Jerzy Karczmarczuk wrote:
One could simply implement IO as a free monad
Interesting. I wonder how.
See [1] for an explanation of free monads in general.
On Fri, Aug 09, 2013 at 12:38:45AM +0700, Kim-Ee Yeoh wrote:
On Thu, Aug 8, 2013 at 11:05 PM, Tom Ellis
tom-lists-haskell-cafe-2...@jaguarpaw.co.uk wrote:
On Thu, Aug 08, 2013 at 03:38:41PM +0200, Jerzy Karczmarczuk wrote:
One could simply implement IO as a free monad
Interesting. I
On Thu, Aug 8, 2013 at 12:22 PM, Lyle Kopnicky li...@qseep.net wrote:
...
So I went to the Data.Hashable page and looked up examples on how to
derive a Hashable instance for my datatype:
http://hackage.haskell.org/packages/archive/hashable/latest/doc/html/Data-Hashable.html
The problem
On Wed, Aug 7, 2013 at 12:48 AM, Mihai Maruseac
mihai.marus...@gmail.com wrote:
Hello,
A friend of mine tried to install Haskell Platform and Leksah on
Windows and was troubled by the amount of problems he encountered as a
beginner in this. I've told him to ask over IRC and mailing list but
I do wish there was a compiler-checked way of specifying a minimum complete
definition.
On Thu, Aug 8, 2013 at 11:02 AM, Joey Adams joeyadams3.14...@gmail.comwrote:
On Thu, Aug 8, 2013 at 12:22 PM, Lyle Kopnicky li...@qseep.net wrote:
...
So I went to the Data.Hashable page and looked up
There is a ticket with discussion and a patch here [0].
Erik
[0] http://ghc.haskell.org/trac/ghc/ticket/7633
On Thu, Aug 8, 2013 at 8:11 PM, David Thomas davidleotho...@gmail.com wrote:
I do wish there was a compiler-checked way of specifying a minimum complete
definition.
On Thu, Aug 8,
While your friend is wrong to blame haskell on his leksah installation
problems i think the culprit here is the leksah web site.
It misinforms users saying that leksah runs on windows. It's like Blizzard
saying Diablo 3 runs on linux because there are reports of linux users
successfully running
Hey Dorin,
I don't understand your claims.
1) haskell has worked perfectly well on windows for quite some time. I used
HUGs nearly a decade ago, and in more recent time (2-3 years ago) I helped
teach an introductory first computer science class using GHC where many
students were doing great work
Hi,
I understood what's wrong about my approach - and since I want to use
an IDE to assist me, I will try both EclipseFP and Sublime Text, to
see how that works. My feeling was that since the leksah website
suggested that cabal is the way to do it and since when I search for a
Haskell IDE that is
On Thu, Aug 8, 2013 at 11:58 AM, Dorin Lazar dorin.la...@gmail.com wrote:
I was also in awe of the fact that nobody really says anything about
these difficulties, and felt like an estranged child that messed
things up badly; however, it seems that the real issue is that nobody
really does it
On 2013-Aug-08, Vagif Verdi and/or a Mail User Agent wrote:
...
Leksah is a linux program intented to run on linux. You can (in some
cases) successfully install and run it on windows, but you would need
to go through certain steps installing some unrelated to windows
software
I was indeed talking about software contracts. I should perhaps have made
that clearer, since I had of course come across SPJ's financial contract
paper due to a similar confusion on Google's part.
Liquid Haskell looks great; might not have been quite what I imagined, but
it's definitely more
Hi all,
I want to start working on GHC, I cloned the repo, made some trivial
changes(change some strings etc.) and re-built and observed the
results. Now I'll continue reading and understanding the source.
While doing this, I think one feature would greatly help me finding my
way through GHC
Hello Ömer,
First off, welcome to the wonderful world of GHC development! I
recommend that you subscribe to the ghc-devs mailing list and
direct GHC specific questions there:
http://www.haskell.org/mailman/listinfo/ghc-devs
While doing this, I think one feature would greatly help me
Ah! It seems that my wording was ambiguous. All I was trying to say is that
there is nothing you can do with an IO action which will cause an otherwise
pure expression to exhibit side effects during evaluation, *not* that an IO
action is observable in pure code or that they are arbitrarily
Hello Edward,
First off, welcome to the wonderful world of GHC development! I
recommend that you subscribe to the ghc-devs mailing list and
direct GHC specific questions there:
http://www.haskell.org/mailman/listinfo/ghc-devs
Thanks, I didn't know that. I subscribed and I will ask
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