On Tue, Aug 28, 2012 at 6:09 PM, Bryan O'Sullivan b...@serpentine.com wrote:
On Mon, Aug 27, 2012 at 10:52 AM, Bryan O'Sullivan b...@serpentine.com
wrote:
The reason you're seeing build breakage is that the .cabal files of the
broken packages were edited in-place without communicating with
I don't know if this is a bug or not, but the translation to type
families works:
class Foo a where
type FooT a :: *
instance Foo Int where
type FooT Int = Float
f :: Int - FooT Int
f = undefined
g :: Int - Float
g = undefined
h :: Int - FooT Int
h = g
You don't even need the class
On Fri, Sep 14, 2012 at 2:01 PM, Sean Leather leat...@cs.uu.nl wrote:
On Fri, Sep 14, 2012 at 12:45 PM, Florian Lorenzen wrote:
I'd like to transform a value of an ADT to a GADT. Suppose I have the
simple expression language
data Exp = Lit Int | Succ Exp | IsZero Exp | If Exp Exp Exp
On Fri, Sep 14, 2012 at 2:27 PM, Erik Hesselink hessel...@gmail.com wrote:
In general, I think you have to work inside an existential. So you
hide the type of the parsed Term inside an existential. If you want to
apply functions to this Term, you unpack, call the function, and
repack.
Maybe I
On Wed, Sep 26, 2012 at 10:58 AM, Johan Tibell johan.tib...@gmail.com wrote:
On Wed, Sep 26, 2012 at 7:44 AM, Carter Schonwald
carter.schonw...@gmail.com wrote:
To the best of my knowledge there is absolutely no reason to use the 32bit
haskell on OS X (aside from memory usage optimization
You could add {-# LANGUAGE DeriveFunctor #-}, and then add 'deriving
Functor' to all your data types (or you could of course manually
define your functor instances). Then what you want is just 'fmap
show'.
Erik
On Tue, Oct 2, 2012 at 9:55 AM, Sergey Mironov ier...@gmail.com wrote:
Hi! I have a
On Wed, Oct 3, 2012 at 6:06 PM, Johan Tibell johan.tib...@gmail.com wrote:
On the behalf of the many contributors to cabal, I'm proud to present
cabal-install-1.16.0.
Congratulations and thanks to all those involved!
To install:
cabal update
cabal install cabal-install-1.16.0
While I would love to have hackage available (or even forced) over
https, I think the biggest reason it currently isn't, is that cabal
would then also need https support. This means the HTTP library would
need https support, which I've heard will be hard to implement
cross-platform (read: on
is perfectly fine. So we could have HTTP for
cabal download only and HTTPS for everything else.
Best regards,
Petr Pudlak
2012/10/28 Erik Hesselink hessel...@gmail.com:
While I would love to have hackage available (or even forced) over
https, I think the biggest reason it currently
On Fri, Nov 9, 2012 at 5:52 PM, Roman Cheplyaka r...@ro-che.info wrote:
* Janek S. fremenz...@poczta.onet.pl [2012-11-09 17:15:26+0100]
but I am aware that if the library were to be released on Hackage I
would have to supply version numbers in the dependencies. The question
is how to
-che.info wrote:
* Erik Hesselink hessel...@gmail.com [2012-11-10 16:40:30+0100]
On Fri, Nov 9, 2012 at 5:52 PM, Roman Cheplyaka r...@ro-che.info
wrote:
* Janek S. fremenz...@poczta.onet.pl [2012-11-09 17:15:26+0100]
but I am aware that if the library were to be released on Hackage I
On Mon, Nov 12, 2012 at 5:13 PM, Johan Tibell johan.tib...@gmail.comwrote:
On Mon, Nov 12, 2012 at 1:06 AM, Erik Hesselink hessel...@gmail.comwrote:
tl;dr: Breakages without upper bounds are annoying and hard to solve for
package consumers. With upper bounds, and especially with sandboxes
On Wed, Nov 14, 2012 at 10:57 AM, Roman Cheplyaka r...@ro-che.info wrote:
* Ivan Lazar Miljenovic ivan.miljeno...@gmail.com [2012-11-14
20:53:23+1100]
Doesn't this prevent the error of this package won't build (even if
the error message doesn't precisely say that)?
Yeah, it replaces one
You need to enable ScopedTypeVariables, and add a forall to introduce the
type variable at the top level. The local variable will then be the *same*
'a' instead of a fresh one:
{-# LANGUAGE ScopedTypeVariables #-}
data D a = D1 a | D2 a (a - a)
f :: forall a. Eq a = D a - a
f (D1 x) =
If you're up for it, Oleg has a lot of interesting material about this
subject [1].
Regards,
Erik
[1] http://okmij.org/ftp/Haskell/typeEQ.html
On Sun, Nov 25, 2012 at 9:36 AM, Takayuki Muranushi muranu...@gmail.comwrote:
Is it possible to write
type family SameType a b :: Bool
which
On Tue, Jan 8, 2013 at 10:54 PM, Joachim Breitner
m...@joachim-breitner.de wrote:
Am Dienstag, den 08.01.2013, 13:01 -0800 schrieb Evan Laforge:
surprisingly, deepseq is not used as much as I thought.
http://packdeps.haskellers.com/reverse/deepseq lists a lot of packages,
but (after
On Wed, Jan 9, 2013 at 2:40 PM, Joachim Breitner
m...@joachim-breitner.de wrote:
Hi Erik,
Am Mittwoch, den 09.01.2013, 14:23 +0100 schrieb Erik Hesselink:
We've also used this approach to debug space-leaks, and would have
loved such a tool. We used deepseq, and compared the heap profiles. We
On Wed, Jan 9, 2013 at 11:38 PM, Joachim Breitner
m...@joachim-breitner.de wrote:
Am Mittwoch, den 09.01.2013, 15:11 +0100 schrieb Erik Hesselink:
We finally solved the problems by completely moving
to strict map operations, strict MVar/TVar operations, and strict data
types.
do you mean
You could do what I do: create an alias in bash. I have in my ~/.bashrc:
alias ciq='cabal install --disable-documentation
--disable-library-profiling --disable-executable-profiling'
The alias 'ciq' stands for 'cabal install quick' and disables things I
don't need during development, but do slow
There's showPickled [0] and unpickleDoc [1], maybe those help?
Erik
[0]
http://hackage.haskell.org/packages/archive/hxt/latest/doc/html/Text-XML-HXT-Arrow-Pickle-Xml.html#v:showPickled
[1]
On Wed, Feb 6, 2013 at 1:18 PM, Austin Seipp mad@gmail.com wrote:
Now, on a slight tangent, in practice, I guess it depends on your
target market. C programs don't necessarily expose the details to make
such rich optimizations possible. And Haskell programmers generally
rely on
You can also set the locale encoding for a handle (e.g.
System.IO.stdin) from code using `System.IO.hSetEncoding` [0].
Erik
[0]
http://hackage.haskell.org/packages/archive/base/latest/doc/html/System-IO.html#v:hSetEncoding
On Thu, Feb 21, 2013 at 12:07 PM, Alexander V Vershilov
Note that cookies are not the solution here. Cookies are just as user
controlled as the url, just less visible. What you need is a session
id: a mapping from a non-consecutive, non-guessable, secret token to
the user id (which is sequential and thus guessable, and often exposed
in urls etc.). It
Is your parser impure? I would expect a function from
String/Text/ByteString to Maybe (SExpr Pos).
Then you have no need for a Handle.
Regards,
Erik
On Thu, Feb 28, 2013 at 2:32 PM, John D. Ramsdell ramsde...@gmail.com wrote:
I think I wasn't clear about my question. I want something that
You could use a GADT:
{-# LANGUAGE GADTs #-}
data T a where
C1 :: Int - T Int
C2 :: Char - T Char
C3 :: T Char - T Char
This will allow you to put a C3 in a C3. If you want to prevent that,
just invent some other index, something like:
{-# LANGUAGE GADTs, EmptyDataDecls #-}
data Yes
On Sun, Apr 14, 2013 at 9:28 AM, Chris Wong
chrisyco+haskell-c...@gmail.com wrote:
On Sun, Apr 14, 2013 at 5:10 PM, Christopher Howard
christopher.how...@frigidcode.com wrote:
type Adjustment a = SaleVariables - a
[...]
instance Monad Adjustment where
(=) = ...
return = ...
I think --reinstall only reinstalls the package you are actually
installing, not the dependencies. You could try using a sandboxing
tool, like cabal-dev. Then you just do 'cabal-dev install', and when
you want to reinstall everything, you do 'rm cabal-dev/' to wipe the
sandbox and start over.
On Thu, Jun 13, 2013 at 4:22 PM, Tobias Dammers tdamm...@gmail.com wrote:
On Thu, Jun 13, 2013 at 05:07:38PM +0300, Mihai Maruseac wrote:
On Thu, Jun 13, 2013 at 5:02 PM, Tobias Dammers tdamm...@gmail.com wrote:
On Thu, Jun 13, 2013 at 09:44:03AM -0400, Andrew Pennebaker wrote:
Could we add
On Thu, Jun 13, 2013 at 4:48 PM, Niklas Hambüchen m...@nh2.me wrote:
As for the user account creation and uploading packages you don't own,
Hackage 2 (any day now) has fixes for both.
Does Hackage 2 have SSL at least for the web interface?
I think it should be possible to set that up by
Tom Lokhorst and myself worked on a tool to generate missing imports,
both qualified and unqualified, at the Odessa hackathon. We created a
working proof of concept [0]. I wasn't aware of fix-imports.
Erik
[0] https://github.com/haskell-suite/halberd
On Tue, Jun 25, 2013 at 6:30 AM, Evan
Perhaps you can use `catches` [0]?
Erik
[0]
http://hackage.haskell.org/packages/archive/base/latest/doc/html/Control-Exception.html#v:catches
On Wed, Jul 3, 2013 at 12:47 PM, Nikita Karetnikov
nik...@karetnikov.org wrote:
I'm trying to update a package that uses 'Control.OldException' (works
The constraint on an instance never influences which instance is
selected. So as far as instance selection goes, 'instance Foo x' and
'instance C x = Foo x' are the same. The constraint is only checked
after the instance is selected.
Erik
On Fri, Jul 5, 2013 at 2:43 PM, Nicholls, Mark
Hi Michael,
We do this as well. In addition to AsyncException, we ignore
BlockedIndefinitelyOnSTM, BlockedIndefinitelyOnMVar and Deadlock. I'm
not sure you can ignore Timeout, since the type is not exported from
System.Timeout. I'm not sure how to classify these, though. They are
in some sense
On Wed, Jul 10, 2013 at 10:39 AM, John Lato jwl...@gmail.com wrote:
I think 'shouldBeCaught' is more often than not the wrong thing. A
whitelist of exceptions you're prepared to handle makes much more sense than
excluding certain operations. Some common whitelists, e.g. filesystem
exceptions
There is a GHC ticket about implementing a DEPENDS pragma for doing
this [0]. There are patches attached, but it looks like it isn't
finished yet.
Erik
[0] http://ghc.haskell.org/trac/ghc/ticket/4900
On Tue, Jul 16, 2013 at 7:41 PM, Johannes Waldmann
waldm...@imn.htwk-leipzig.de wrote:
Hi.
On Fri, Jul 26, 2013 at 6:44 PM, Andreas Abel andreas.a...@ifi.lmu.de wrote:
mapSnd f = (id *** f)
As a very small aside, this is just `second` from Control.Arrow.
Erik
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What about `pure`? It's already used in applicative, and has the
motivation that it's embedding a pure value in some context. Since I
don't know the details of your project, I don't know if you need two
names (one for the applicative version, and one for the monadic
version).
Erik
On Tue, Aug 6,
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,
I'm not sure, but there are weak pointer [0], though I have never used them.
Erik
[0]
http://www.haskell.org/ghc/docs/latest/html/libraries/base/System-Mem-Weak.html
On Sat, Aug 10, 2013 at 7:13 PM, Aleksey Uymanov s9gf4...@gmail.com wrote:
Hello, haskellers.
Is there any package
On Thu, Aug 15, 2013 at 5:39 AM, Jason Dagit dag...@gmail.com wrote:
Also, if anyone wants to look at prior art first, Idris supports applicative
brackets.
As does she [0].
Erik
[0] https://personal.cis.strath.ac.uk/conor.mcbride/pub/she/idiom.html
On Thu, Aug 22, 2013 at 9:23 PM, Mateusz Kowalczyk
fuuze...@fuuzetsu.co.uk wrote:
On 22/08/13 19:30, jabolo...@google.com wrote:
Hi,
I noticed Hayoo appears as a link in the toolbox of
http://hackage.haskell.org and also that Hayoo seems to display better
results than Hoogle. For example,
On Mon, Sep 16, 2013 at 10:16 AM, Henning Thielemann
lemm...@henning-thielemann.de wrote:
On Wed, 4 Sep 2013, Johan Tibell wrote:
* GHCi support. It's now much easier to use ghci when developing your
packages, especially if those packages require preprocessors (e.g.
hsc2hs).
That's a great
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