On 13-09-21 05:13 AM, Vlatko Basic wrote:
I'd like to extract A texts from row with header Caption, and have
come up with this
runX $ doc
(deep (hasName tr) --
filter only TRs
withTraceLevel 5 traceTree --
shows
On 13-09-20 07:47 AM, damodar kulkarni wrote:
*Main sqrt (10.0) ==3.1622776601683795
True
[...]
*Main sqrt (10.0) ==3.16227766016837956435443343
True
This is not even specific to Haskell. Every language that provides
floating point and floating point equality does this.
(To date,
A specification language is desirable. (Test cases are special cases of
specifications. Test-driven development is a revival of the waterfall
process.) For specifying interactions (computer-computer or
computer-human), I recommend live sequence charts of David Harel, or
generally any one based
On 13-09-10 09:27 PM, Thiago Negri wrote:
The package GLFW is not building in Cabal 1.18.
Setup.hs [1] depends on `rawSystemStdInOut` [2] that changed signature
between 1.16 and 1.18.
Consider cabal install --cabal-lib-version=1.16.
Replace 1.16 by the correct number. Use ghc-pkg list Cabal
On 13-09-11 07:31 AM, Obscaenvs wrote:
since the official version is a bit too TimesNewRoman-y for my
...developed taste.
I question that. Is it the official CSS, or is it your own browser
setting? I see no TimesNewRoman-y here.
The official version in my Firefox (Ubuntu 13.04 Desktop):
On 13-09-01 02:02 AM, yi lu wrote:
I have noticed if *bar* is predefined or it is a number, it can be used
as arguments. But can other strings be used this way? Like in bash, we
can use *ping 127.0.0.1* where *127.0.0.1* is an argument.
Does Bash have a rich type system, like Haskell?
Does
On 13-09-01 02:41 AM, Mateusz Kowalczyk wrote:
It's a bit like asking whether you can do addition everywhere by just
typing the numbers to each other (no cheating and defining number
literals as functions ;) ).
To your horror, common math language does some of that.
When 3 and ½ are typed
On 13-08-26 04:46 AM, Niklas Hambüchen wrote:
Effectively, sequence is a partial function.
(Note: We are not trying to obtain a lazy list of random numbers, use
any kind of streaming or the likes. We want the list in memory and use it.)
We noticed that this problem did not happen if sequence
On 13-08-19 10:58 AM, Ketil Malde wrote:
b) the output isn't very helpful in tracking down the cause of this
problem, it claims that all these packages depend on array-0.4.0.1,
which is a lie. Somewhere, somehow, somethings depends on this (or at
least a newer version), but I have no clue how
On 13-08-16 03:29 PM, Dan Burton wrote:
Idioms are oblivious, arrows are meticulous, monads are promiscuous
http://homepages.inf.ed.ac.uk/wadler/papers/arrows-and-idioms/arrows-and-idioms.pdf
I much recommend this paper. Underrated, underknown, pinpointing, unifying.
On 13-08-07 01:18 AM, Mihai Maruseac wrote:
Anyway, he blogged about his problems at
http://dorinlazar.ro/haskell-platform-windows-crippled/ and I'm sure
that we can work on fixing some of them.
To learn Haskell on Windows, and with Haskell Platform already
installed, it is very easy and KISS
On 13-08-06 01:14 AM, J. Stutterheim wrote:
N.B. I am _not_ proposing that we actually change the name of `return`. I do
currently have the opportunity to pick names for common functions in a
non-Haskell related project, so I was wondering if there perhaps is a better
name for `return`.
I
On 13-07-29 08:35 AM, Nikita Karetnikov wrote:
I feel that a 'myThreadId' action, which is defined in this module [1],
is useless, but I'm not sure. I think it will always return the
Map.find: element not in the map exception because a 'threadMap'
contains an empty 'ThreadMap'.
Is it right, or
On 13-07-06 12:12 PM, Nikita Karetnikov wrote:
Is there an open sum type or a closed existential type?
OCaml has open sum types.
I haven't really seen closed existential types. (I have seen some
approximations, but each lacks one last bit.)
___
On 13-06-28 04:06 AM, Rouan van Dalen wrote:
Now when I try to install the latest version of the [time] package, I have 2
time packages, 1 in the global package db (the older version), and 1 in
the user package db
(the newer version).
Now I would like subsequent installed packages to always use
On 13-06-13 11:09 AM, Niklas Hambüchen wrote:
https://github.com/nh2/custom-hackage
An (almost trivial) script to generate 00-index.tar.gz which is
necessary to run your own `remote-repo`.
I write the following critique with much reluctance, since I will be
saying a lot of this cannot
On 13-05-25 04:52 PM, Daniel Díaz Casanueva wrote:
As you already know, cabal-install is configured in the file config.
It has a lot of fields, but I didn't find a single place where each
field is explained with detail.
There is none, but my new and timely
On 13-05-03 10:35 AM, Niklas Hambüchen wrote:
runhaskell -fno-warn-unused-matches Myfile.hs
[no output whatsoever but exit code 127]
runhaskell -fasdf Myfile.hs
[no output whatsoever but exit code 127]
$ runghc --help
Usage: runghc [runghc flags] [GHC flags] module [program args]
The
When I was writing
http://www.vex.net/~trebla/haskell/crossroad.xhtml
I wanted to write: branching on predicates and then using selectors is
less efficient than pattern matching, since selectors repeat the tests
already done by predicates.
It is only ethical to verify this claim before
On 13-04-14 10:22 PM, Evan Laforge wrote:
I tried to colorize a haskeline prompt by putting control characters
in it, but line editing was hopelessly confused, presumably because
haskeline doesn't understand control characters and thought the prompt
was longer than it really was.
On 13-04-13 12:19 AM, Daniel Díaz Casanueva wrote:
Hi cafe!
Probably you all know how to do this, but I myself found confused when
building the Haskell Platform in Linux for my first time. I was using
Linux for my first time too! The first problem I encountered was to
decide what linux packages
On 13-04-14 08:12 PM, Daniel Díaz Casanueva wrote:
By the way, a random question, what's the memory of the computer you
used to build the Platform?
I have always used my laptop with 3GB RAM. I have not measured how much
is actually needed, or what happens if I provide less.
On 13-04-05 04:56 AM, Tom Ellis wrote:
any is very ambiguous. Doesn't the problem go away if you replace it with
all?
Yes, that is even better.
The world would be simple and elegant if it did things your way, and
would still be not too shabby if it did things my way, no?
«Learn You a
On 13-04-04 01:07 AM, wren ng thornton wrote:
When the quantifiers are implicit, we can rely on the unique human ability
to DWIM. This is a tremendous advantage when first teaching people about
mathematical concerns from a logical perspective. However, once people
move beyond the basics of
On 13-04-03 07:39 PM, Alexander Solla wrote:
There's your problem. Mathematicians do this specifically because it is
helpful. If anything, explicit quantifiers and their interpretations
are more complicated. People seem to naturally get how scoping works in
mathematics until they have to
On 13-04-01 06:26 AM, Roger Mason wrote:
It turned out that there was a stale version of 'array' lurking in the
ghc package db. In spite of reinstalling ghc it did not go away until I
unregistered it. I think it was persisting because re-installing ghc
simply unpacked over the old directory
On 13-03-20 06:54 PM, OWP wrote:
For me personally, one thing I enjoy about a typical procedural program
is that it allows me to Brute Force Learn.
[...]
1. I believe that you can also stare at functional programs and figure
out as much as what you can with procedural programs.
It only
On 13-03-18 09:19 AM, Jesper Särnesjö wrote:
Interestingly, running the program in GHCi with the -fno-ghci-sandbox
flag, causes it to misbehave in the same way as when compiled:
Then perhaps to mimic default ghci in hope of getting good results:
- compile with -threaded (more candidly, link
On 13-03-08 11:53 PM, Edward Z. Yang wrote:
Are these equivalent? If not, under what circumstances are they not
equivalent? When should you use each?
evaluate a return b
a `seq` return b
return (a `seq` b)
Let a = div 0 0
(or whatever pure but problematic expression you like)
On 13-03-05 12:19 AM, Christopher Howard wrote:
Hi. My Haskell is (sadly) getting a bit rusty. I was wondering what
would be the most straightforward and easily followed procedure for
translating a recursively defined sequence into a Haskell function. For
example, this one from a homework
On 13-03-01 05:10 AM, Malcolm Wallace wrote:
Doesn't Cabal tend to install library packages under the .cabal folder? So
blowing it away gets rid of the problematic ones. (And everything else.)
You need to perform scientific experiments to refute that claim, then see my
On 13-02-25 06:50 AM, Johannes Waldmann wrote:
or in general, A (and B.1) are baked into ghc,
but there is some B.2/B.3 out there which U wants to use.
Or is this what already happens? (ghc would notice
that B.1.foo is different from B.2.foo.
cabal-install would warn, but proceed?
Then the
On 13-02-21 04:58 AM, Semyon Kholodnov wrote:
— Windows console is locked to one specific local code page, and no
codepage contains Latin-1, Cyrillic and Kanji symbols at the same
time.
Windows console is not locked to an anti-international code page; it is
only defaulted to.
Use CHCP 65001
On 13-02-21 05:18 AM, Doaitse Swierstra wrote:
I ran into the problem that for the packages which I install using
cabal install
The generated html does not contain links to the sources. This issue was raised
before in:
On 13-02-04 02:56 AM, Alfredo Di Napoli wrote:
Reverse engineering (aka Google searching) for Hacklab seems to reveal
that the location is Edimburgh: Correct? :D
There are many Hacklabs worldwide. But this one is Toronto, Canada. I
know because Christopher runs the Toronto Haskell Meetup and
If you possess multiple instances (may be different versions, may be
same version different builds) of a package, life can be hard and
confusing. The problems are explained in my
http://www.vex.net/~trebla/haskell/sicp.xhtml
and faced by many people regularly. (Just read this mailing list.)
On 13-01-25 02:06 PM, Simon Michael wrote:
People have put a lot of work into regular expression libraries on
haskell. Yet it seems very few of them provide a replace/substitute
function - just regex-compat and regepr as far as I know. Why is that ?
[...]
Secondly, as of today what do y'all do
On 13-01-16 10:04 AM, Luis Cabellos wrote:
You should read
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.22.6768
If you want to be efficient with floats. Language independent.
And also http://floating-point-gui.de/
___
Haskell-Cafe
On 13-01-15 12:06 AM, Magicloud Magiclouds wrote:
I have enabled document in .cabal/config, so I could get document
every time I installed libraries or so.
But when I compile my own applications, it also takes time on
generating non-exist documents. How to disable it just for this project?
On 13-01-15 09:10 PM, Magicloud Magiclouds wrote:
So the only way is to use param every time I build this certain project?
Really hoping I could disable it in project.cabal
The param is for cabal install only. So don't use cabal install.
cabal configure # may be skipped usually
cabal
On 13-01-07 12:12 AM, Thomas Hartman wrote:
I have a space leak in a function that increments a number inside
IORef or STRef (either lazy or strict).
IORef and STRef operations do not automatically evaluate contents.
writeIORef r (x + 1) simply stores a pointer to the expression (thunk)
x +
On 13-01-02 01:01 AM, xuan bach wrote:
=
BASEDIR=/usr/local
INCS= -I$(BASEDIR)/include/omega -I.
LIBS= -L$(BASEDIR)/lib
LIB= -lcode_gen -lomega -lm
GHC=ghc
#
CFILES=$(CURDIR)/cfile
HSFILES=$(CURDIR)/hsfile
On 13-01-04 04:36 PM, Niklas Hambüchen wrote:
I get the following:
$ cabal install --only-dependencies --reinstall
Resolving dependencies...
All the requested packages are already installed:
Use --reinstall if you want to reinstall anyway.
Can somebody confirm that they see the same?
I
On 12-12-08 07:39 AM, Ivan Perez wrote:
When you install A, you may not know that you'll need to depend on a
lower version of bytestring later on. Cabal will pick the highest
version available (0.10 if present). If a program you install later on
depends on A (needs bytestring-0.10) and ghc
On 12-12-05 12:48 AM, Jason Dagit wrote:
I thought it was possible to get around this with lazy patterns such
Wadler's force function [1]?
(untested code)
force y =
let Just x = y
in Just x
lazyDecode :: FromJSON a = ByteString - Maybe a
lazyDecode = force . decode
This says, the type
On 12-12-05 01:52 PM, Ivan Perez wrote:
I've spent the last couple of days fighting my way around a dependency
hell with my own libraries and packages.
If I install them package by package (by hand), I'm very likely to hit
one of these conflicts that I'm talking about. A simple example of
On 12-11-30 01:16 PM, Mark Thom wrote:
Is there a paper or other single resource that will help me thoroughly
understand non-strictness in Haskell?
See my http://www.vex.net/~trebla/haskell/lazy.xhtml
___
Haskell-Cafe mailing list
On 12-11-27 04:40 AM, kudah wrote:
On Tue, 27 Nov 2012 02:20:35 -0500 Albert Y. C. Lai tre...@vex.net
wrote:
When cabal build succeeds, it always says:
(older) registering name-version
(newer) In-place registering name-version
That's what it says. But use ghc-pkg and other tests to verify
On 12-11-26 04:34 AM, Kim-Ee Yeoh wrote:
Nice tip, Albert! Good to know! One question I have is, is (runghc
Setup.lhs) equivalent to (cabal) in
runghc Setup.lhs $ [configure, build, install]
?
Setup defaults to --global --prefix=/usr/local
cabal defaults to --user --prefix=$HOME/.cabal
This
On 12-11-27 01:02 AM, kudah wrote:
On Mon, 26 Nov 2012 18:21:33 -0500 Albert Y. C. Lai tre...@vex.net
wrote:
Lastly, there is no Setup install. Use copy and register.
$ runghc Setup.hs --help
[...]
install Copy the files into the install locations. Run register.
copy
Among many programmers, and/or users who manually unpack source tarball
before installing, this idiom is very common:
cabal configure
cabal build
cabal install
This idiom is an urban legend, i.e., a popular error.
cabal install re-does the configure and the build steps, among
other things.
On 12-11-20 08:48 AM, Gregory Guthrie wrote:
It was also interesting to note a comment that most developers don't have access
to a Windows machine for testing. With Windows at 90% of the computing market
(Linux = 1.6%), this seems like a problem which might limit growth of Haskell
usage.
On 12-11-20 06:54 AM, c...@lavabit.com wrote:
I know nothing about compilers and interpreters. I checked several
books, but none of them explained why we have to translate a
high-level language into a small (core) language. Is it impossible
(very hard) to directly translate high-level language
On 12-11-19 09:39 PM, Magicloud Magiclouds wrote:
And, the key point is that using upgrade-dependencies with
cabal-install. I am using git (current) version of cabal-install.
Without that argument, things could be fine. With it, it must fail.
Therefore, don't use upgrade-dependencies.
On 12-11-20 05:37 PM, Gregory Guthrie wrote:
No; the first sentence says that someone else had reported that testing on
Windows was hard to do because of (a perceived) lack of access to Windows by
Haskell developers... The implication is that Haskell developers (only/mainly)
use *nix.
I
On 12-11-20 08:20 PM, Johan Tibell wrote:
This logic is flawed. More than 90% of computers having Windows doesn't
imply that 90% of all computers in a given household runs Windows.
What's the probability that your household has a Windows computer if
you're a programmer that don't live with your
On 12-11-19 04:45 AM, Ivan Lazar Miljenovic wrote:
On 19 November 2012 18:21, Magicloud Magiclouds
magicloud.magiclo...@gmail.com wrote:
command line: cannot satisfy -package Cabal-1.16.0:
Cabal-1.16.0-dd0ce1db6fea670a788547ee85411486 is unusable due to missing
or recursive dependencies:
On 12-11-19 04:25 PM, Gregory Guthrie wrote:
I am not exert in the area, but I wonder how /why/ this is different than other
package managers, like apt in Linux, I have never had any problems with it, and
I would think that their dependencies are of at least similar complexities.
I feel very
On 12-11-17 02:19 AM, damodar kulkarni wrote:
Let's see tthis:
Prelude :t 3 a
3 a :: (Num ([Char] - t)) = t
No complaint from GHC; but now see this:
Prelude :t a 3
interactive:1:0:
Couldn't match expected type `t1 - t'
against inferred type `[Char]'
In the expression: a
On 12-11-16 02:10 AM, Daryoush Mehrtash wrote:
I am having hard time understanding how removing the outer parenthesis in
(max.(+1)) 2 2
to
max.(+1) 2 2
changes the meaning of expression.
I recommend http://bm380.user.srcf.net/prettyparsetree.cgi for
discovering the correct parse.
On 12-11-07 12:00 AM, Mike Craig wrote:
Got it. Thanks for the info, Erik. I've updated my cabal config and
reinstalled some of the global packages, and the world seems much less
bleak! :)
The good news is that whatever comes with GHC comes with profiling, you
do not need to reinstall them.
On 12-11-07 03:36 PM, timothyho...@seznam.cz wrote:
I am trying to catch an thread blocked on MVar indefinitely
exception. Of course I can use ::SomeException as explained in
http://hackage.haskell.org/packages/archive/base/latest/doc/html/Control-Exception.html#g:3
but there is no explanation
On 12-10-06 05:18 AM, Johannes Waldmann wrote:
wren ng thornton wren at freegeek.org writes:
As for whether the default should be infix 9 instead of infixl 9 ...
that was exactly the point of my message. - J.
Perhaps, half of the people want infixl, another half of the people want
infixr,
On 12-10-01 05:34 AM, Jon Fairbairn wrote:
Albert Y. C. Lai tre...@vex.net writes:
On 12-09-30 06:33 PM, Jake McArthur wrote:
When discussing monads, at least, a side effect is an effect that is
triggered by merely evaluating an expression. A monad is an interface
that decouples effects from
On 12-09-29 09:57 PM, Vasili I. Galchin wrote:
I would an examples of monads that are pure, i.e. no side-effects.
What does side effect mean, to you? Definition?
Because some people say State has no side effect, and some other
people say State has side effects. The two groups use
On 12-09-30 06:33 PM, Jake McArthur wrote:
When discussing monads, at least, a side effect is an effect that is
triggered by merely evaluating an expression. A monad is an interface
that decouples effects from evaluation.
I don't understand that definition. Or maybe I do subconsciously.
I
On 12-09-14 05:18 PM, Andrew Pennebaker wrote:
One thing I want to double check is that Haskell does, in fact,
automatically memoize all pure function calls. Is this true?
A simple back-of-envelope calculation that immediately raises doubts:
2 seconds on a 2 GHz computer is 4x10^9 clock
On 12-08-31 01:59 AM, jeff p wrote:
I have a sample file (attached) which I cannot read into Text:
Prelude Control.Applicative Data.Text.IO.readFile foo
*** Exception: utf8.txt: hGetContents: invalid argument (invalid
byte sequence)
Prelude Control.Applicative
On 12-08-15 03:20 AM, wren ng thornton wrote:
(forall a. P(a)) - Q = exists a. (P(a) - Q)
For example:
A. (forall p. p drinks) - (everyone drinks)
B. exists p. ((p drinks) - (everyone drinks))
In a recent poll, 100% of respondents think A true, 90% of them think B
paradoxical, and
On 12-08-12 02:18 PM, KC wrote:
I use cabal install repa but then WinGHCi says
module Data.Array.Rep.Algorithms.Ramdomish not found.
___
Haskell-Cafe mailing list
Haskell-Cafe@haskell.org
http://www.haskell.org/mailman/listinfo/haskell-cafe
On 12-08-08 03:24 PM, silly wrote:
The problem is that when I try this
parse integer 7
I get the following error:
Left (line 1, column 6):
unexpected end of input
expecting digit
integer overflow
ie there are three error messages but I only want the last one. Is
there something I
On 12-07-25 09:06 AM, Mathieu Boespflug wrote:
Albert Y. C. Lai tre...@vex.net writes:
foldr (+) and foldl (+) for Int have the same asymptotic costs, both
time and space. See my http://www.vex.net/~trebla/haskell/lazy.xhtml
Therefore, I do not understand why they are labeled opposite space
On 12-07-23 10:52 PM, Qi Qi wrote:
Foldl has the space leak effect, and that's why foldl' has been
recommended.
foldr (+) and foldl (+) for Int have the same asymptotic costs, both
time and space. See my http://www.vex.net/~trebla/haskell/lazy.xhtml
Therefore, I do not understand why they
On 12-07-17 01:43 PM, Levent Erkok wrote:
It still feels like this'll start biting more folks down the road. I've
created the following cabal ticket so it can be tracked:
https://github.com/haskell/cabal/issues/978
However, my understanding of the problem is rather incomplete; please
feel free
On 12-07-10 11:35 PM, Brandon Allbery wrote:
Quoth the Fine Manual (8.2.1.1. Using your own main()
http://www.haskell.org/ghc/docs/latest/html/users_guide/ffi-ghc.html#using-own-main):
There can be multiple calls to |hs_init()|, but each one should be
matched by one (and only one) call to
On 12-07-15 08:37 PM, Felipe Almeida Lessa wrote:
Would that be:
Prog ::= nop | hs_init(); Prog'; hs_exit();
Prog' ::= nop | hs_init(); Prog'; hs_exit(); | Prog' Prog'
Yeah, I keep forgetting that.
___
Haskell-Cafe mailing list
On 12-07-11 09:28 PM, Magicloud Magiclouds wrote:
And Albert, I did not directly install QuickCheck. It was required by yesod.
I can't reproduce that dependency either. Output of cabal install
--dry-run yesod does not contain QuickCheck or template-haskell. I do
not have QuickCheck
On 12-07-11 05:28 AM, Magicloud Magiclouds wrote:
I am using ghc 7.4.2 which includes template-haskell-2.7.0.0.
When I installed QuickCheck-2.5, it requires template-haskell-2.6.0.0.
Even I removed all user space packages, the error was still.
Cannot reproduce. I start with ubuntu 11.04 x86
On 12-07-03 04:19 AM, Magicloud Magiclouds wrote:
$ cabal --upgrade-dependencies --enable-documentation
--force-reinstalls --solver=topdown QuickCheck-2.5
Test/QuickCheck/All.hs:15:1:
Bad interface file:
/home/magicloud/.cabal/lib/template-haskell-2.6.0.0/ghc-7.4.2/Language/Haskell/TH.hi
On 12-07-04 10:58 AM, Yves Parès wrote:
the package http://hackage.haskell.org/package/haskelldb-hdbc-mysql/ the
use of HDBC 2.3.0
I'm using cabal-install 0.14, and with a fresh install (no packages
already installed), cabal-install tries to install HDBC-2.1.1 instead
of, say, HDBC-2.2.7.0.
On 12-06-27 11:29 AM, Sjoerd Visscher wrote:
I tried to install reactive-banana. This failed due to a dependency conflict,
and then I noticed there was a newer version of reactive-banana. So I did cabal
update, and tried to install again. But whatever I do, cabal keeps trying to
install
On 12-06-20 07:59 PM, Hilco Wijbenga wrote:
hilco@centaur ~ ~$ rm -rf .cabal/
I am not sure why you start with this.
If you do this for a clean start, see my
http://www.vex.net/~trebla/haskell/sicp.xhtml#remove
for why it is not a clean start.
If you do this for some other purpose,
On 12-05-05 04:19 PM, Graham Berks wrote:
New to haskell and having issues resolving packages, have the following
output below and can't seem to resolve it.
Text seems to have diff hash dependancies when I try and instal a diff
version of 0.11.2.0 etc
Any ideas on what todo ??
Thanks
$
On 12-05-06 01:58 AM, Tom Murphy wrote:
FWIW, I loved the tone of those books, and I think it helps many people
learn the material. It's nice to have a little reminder every once in a
while: good job! Now go take a break; make some cookies - here's a recipe
Learn_You_a_Baking_for_Great .
On 12-05-04 07:03 PM, Станислав Черничкин wrote:
Hi, guys, I'm interested in best practices in using of each approach.
Personally I like MonadError because it is more explicit and
Control.Exception-s becomes really ugly in complex scenarios.
[...]
User has to deal with
both, but have no
On 12-03-28 06:30 PM, Brandon Allbery wrote:
Did you also remove ~/.ghc? Libraries are actually installed and
registered there, not under ~/.cabal.
Reality is less simplistic than that. .ghc has library metadata. .cabal
has library files. See my
http://www.vex.net/~trebla/haskell/sicp.xhtml
On 12-03-19 10:05 PM, Richard O'Keefe wrote:
http://www.haskell.org/onlinereport/haskell2010/haskellch9.html#x16-1710009
Haskell 2010 is already beginning to be out of date.
http://thread.gmane.org/gmane.comp.lang.haskell.libraries/16125/focus=16324
On 12-02-27 04:36 PM, rocon...@theorem.ca wrote:
In less than 5 minutes I can solve NP-Complete problems in restaurant
orders:
http://www.reddit.com/comments/24p2c/xkcd_does_anyone_else_feel_compelled_to_solve_this/c24pc5
and right in haskell-cafe:
I cannot reproduce pretty much any claim made in this thread. Unless PIO
does not mean System.IO.Posix.
I run mkfifo hello to create a named pipe. Then I run this program to
keep trying to open for writing, non-blocking (without anyone at the
read end initially):
import System.Posix.IO
On 12-02-14 03:01 PM, JP Moresmau wrote:
I'm confused: I'm using GHC 7.0.2 and Cabal 1.10.1.0 with
cabal-install 0.10.2. I use -Wall in my Cabal file. If I build a
Haskell file with unused do binds, via the GHC API I get no warning,
which is normal, since the doc states: The warnings that are
On 12-02-12 09:18 AM, Yves Parès wrote:
According to the documentation
(http://hackage.haskell.org/packages/archive/base/4.5.0.0/doc/html/Foreign-StablePtr.html),
StablePtrs aims at being opaque on C-side.
The doc multiply warns again and again that StablePtr, as well as
whatever Ptr you get
http://www.vex.net/~trebla/haskell/lazy.xhtml
It is half done.
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On 12-02-02 12:12 AM, Scott Lawrence wrote:
When running cabal install with --extra-lib-dirs=./lib, if a package is
found both in ~/.cabal/lib and ./lib, cabal seems to favor the
~/.cabal/lib one. Is there some way to specify the correct precedence to
use?
--extra-lib-dirs is for C libs only.
On 12-01-30 08:06 AM, Pēteris Paikens wrote:
import Text.XML.HXT.Core
import Text.XML.HXT.DOM.XmlTreeFilter
selectAllText :: ArrowXml a = a XmlTree XmlTree
selectAllText = deep isXText
Delete import Text.XML.HXT.DOM.XmlTreeFilter. Change isXText to
isText. That is,
import
On 12-01-25 04:06 PM, Yves Parès wrote:
1) Is there some documentation about it?
GHC comes with a user guide in HTML somewhere on your disk.
It is also on the GHC website, but I much prefer everyone to know and
find it on his/her disk first.
People spend lifetimes browsing the web, and not
On 11-12-26 10:55 AM, Eugene Kirpichov wrote:
How do I most efficiently convert a Double to a Data.Fixed?
Double is an instance of Real, Fixed E12 is an instance of Fractional,
they are eligible for realToFrac.
Similarly for many time types.
___
There are two flavours of MonadState, Control.Monad.State.Lazy and
Control.Monad.State.Strict. There are two flavours of ByteString,
Data.ByteString.Lazy and Data.Bytestring (whose doc says strict).
There are two flavours of I/O libraries, lazy and strict. There are
advices of the form: the
Most individuals of the Haskell community have long been maintaining a
cognitive dissonance; some cases turn into plain hypocrisy. You might
excuse it for its ancient and prominent origin: Richard Bird and/or
Philip Wadler themselves wrote like it is too lazy, make it more
strict 13 years ago
On 11-12-04 07:08 AM, dokondr wrote:
In GHC 7.0.3 / Mac OS X when trying to:
writeFile someFile (Hoping You Have A iPhone When I Do This) Lol
Sleep Is When You Close These ---gt; \55357\56384
I get:
commitBuffer: invalid argument (Illegal byte sequence)
The string I am trying to write can
On 11-11-22 12:22 AM, Jeremy Shaw wrote:
A mascot is supposed to represent characteristics, emotions, or
desires that a particular group of people aspire to have, be like,
etc. To outsiders, it provides a quick way to see if it might be a
group they would like to belong to, and for insiders, it
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