On 2/2/11 11:25 PM, Maciej Wos wrote:
I think the problem is that the iteratee you give to I.convStream
always returns Just [something] while you should return Nothing on
EOF.
That makes sense for the hanging problem (which I only noticed during
debugging). Though I still get the the same
I agree with Maciej Wos' diagnosis and solution. I'd like to point out
that the Tiff library has to do a similar processing: use an iteratee
to read bytes from the outer stream and to produce elements for the
inner stream (e.g., signed 32-bit integers). In your version of the
Iteratee library,
Navin Rustagi navin_ku...@yahoo.com writes:
It gives the error ERROR - Control stack overflow. I assume it is
because of the lazy evaluation.
Yes, you're just building a tower of additions, and when evaluating
this, you blow up the stack. You need to make sure to evaluate the
tuple element
* Duncan Coutts duncan.cou...@googlemail.com [2011-02-02 01:33:22+]
These are all hosted on the community server. The community server was
hacked on the 26th January and we took it offline. The server was
running an old version of debian that was no longer supported with
security updates.
Hi Navin,
next time, could you please choose more informative subject for your
emails to the mailing list? It is read by many people, and choosing a
good subject will save them a lot of time. In this case, something like
Stack overflow or How to make a function strict would do.
Thanks.
--
One :Thank you Carsten Schultz,Daniel Fischer,Mihai and all the other for
your help.
Two:After my last post I wrote some function that should help me in the
future,but I need some help with the followint as I'm tired and have to fit
in a schedule.I know it is long so I'll try and explain it as
Does anyone have a working example of #include'ing Haskell code into a
bird-tracks-style .lhs file with GHC? Every way I try leads to parsing
errors. Is there documentation about how it's supposed to work?
Help much appreciated. - Conal
___
Hi,
I am studying type classes using examples from the literature [1].
The attached code is a formalization of basic object oriented ideas. The
particular approach seems to be built on the concepts of: thing, object,
and identifier.
I have no intension to implement anything or significantly change
On 3 February 2011 21:09, Patrick Browne patrick.bro...@dit.ie wrote:
Hi,
I am studying type classes using examples from the literature [1].
The attached code is a formalization of basic object oriented ideas. The
particular approach seems to be built on the concepts of: thing, object,
and
On 3 February 2011 02:35, Brandon Moore brandon_m_mo...@yahoo.com wrote:
Here's one thing to consider:
Can you write a function
f :: (Data a) = a - String
f x = termTag x
It would seem the Data a = Term a instance justifies
this function, and it will always use the default instance.
No, obj is a method of the Objects class. you've already declared it
in the instance of Objects Object
your code works just fine here. adding:
mycar = Car Blue
o:: Object Car Integer
o = obj mycar 4
ghci says...
*Objects :t obj
obj :: (Objects o t i) = t - i - o t i
*Objects o
Obj (Car
On Thursday 03 February 2011 10:33:23, Conal Elliott wrote:
Does anyone have a working example of #include'ing Haskell code into a
bird-tracks-style .lhs file with GHC? Every way I try leads to parsing
errors. Is there documentation about how it's supposed to work?
Help much appreciated. -
Hi,
I've been working on a Haskell based platform independent graphics rendering
using VNC. I'd like it very much if you could take a look at it and give me
feedback. Using it is straight forward -
git clone g...@github.com:ckkashyap/Chitra.git
cd Chitra
make
./Main 100 100 5900
Main starts off
One thing to notice:
$ cabal install network-server
is needed.
Best regards,
Krzysztof Skrzętnicki
On Thu, Feb 3, 2011 at 12:15, C K Kashyap ckkash...@gmail.com wrote:
Hi,
I've been working on a Haskell based platform independent graphics
rendering
using VNC. I'd like it very much if you
On Thu, 2011-02-03 at 10:37 +0200, Roman Cheplyaka wrote:
* Duncan Coutts duncan.cou...@googlemail.com [2011-02-02 01:33:22+]
These are all hosted on the community server. The community server was
hacked on the 26th January and we took it offline. The server was
running an old version
From: wren ng thornton w...@freegeek.org
On 2/2/11 11:25 PM, Maciej Wos wrote:
I think the problem is that the iteratee you give to I.convStream
always returns Just [something] while you should return Nothing on
EOF.
That makes sense for the hanging problem (which I only noticed during
Michael Snoyman mich...@snoyman.com wrote:
On Mon, Jan 31, 2011 at 1:09 PM, Ertugrul Soeylemez e...@ertes.de wrote:
how well do WAI, Yesod and the 'persistent' package play with
concurrency? For example, I'd like to write a program, which
concurrently provides two related sites as well
Apologies for multiple copies.
Best,
/Henrik
--
Henrik Nilsson
School of Computer Science
The University of Nottingham
n...@cs.nott.ac.uk
+--+
PhD Studentships in Functional Programming
School of
On Thu, Feb 3, 2011 at 3:14 PM, Ertugrul Soeylemez e...@ertes.de wrote:
Michael Snoyman mich...@snoyman.com wrote:
On Mon, Jan 31, 2011 at 1:09 PM, Ertugrul Soeylemez e...@ertes.de wrote:
how well do WAI, Yesod and the 'persistent' package play with
concurrency? For example, I'd like to
Hi Kashyap,
What a fun project! I was able to build and run on Windows (GHC 6.12.3 and
TightVNC 1.4.4) with a few minor changes:
Remove from Chitra\Canvas.hs
import Network.Server
import Network.Socket
I think these are artifacts from a previous version and are not used. For
whatever reason
Am 03.02.2011 12:15, schrieb C K Kashyap:
Hi,
I've been working on a Haskell based platform independent graphics rendering
using VNC. I'd like it very much if you could take a look at it and give me
feedback. Using it is straight forward -
git clone g...@github.com:ckkashyap/Chitra.git
I originally posted this on haskell-GHC-users, but was curious how the wider
community felt.
The last 32-bit, Intel Mac was the Mac Mini, discontinued in August 2007. The
bulk of them were discontinued in 2006, along with PowerPC Macs. Does it make
sense to relegate OSX x86_64 to community
maeder@leibniz:/local/maeder git clone g...@github.com:
ckkashyap/Chitra.git
Initialized empty Git repository in /local/maeder/Chitra/.git/
Permission denied (publickey).
fatal: The remote end hung up unexpectedly
maeder@leibniz:/local/maeder git --version
git version 1.7.1
What
I think you want:
git clone git://github.com/ckkashyap/Chitra.git
On Thu, Feb 3, 2011 at 10:50 AM, Christian Maeder
christian.mae...@dfki.dewrote:
Am 03.02.2011 12:15, schrieb C K Kashyap:
Hi,
I've been working on a Haskell based platform independent graphics
rendering
using VNC. I'd
Attached is the Cabal file I used to build (it wasn't clear what license
things are under so those fields are commented out).
Thanks a ton Rayan ... I am glad you liked it.
I've checked in the cabal file - I am not familiar with it though ... how
exactly can I use it to build the project?
Am 03.02.2011 17:20, schrieb C K Kashyap:
Oops, you can use git://github.com/ckkashyap/Chitra.git
http://github.com/ckkashyap/Chitra.git - sorry about that.
You can also visit https://github.com/ckkashyap/Chitra
Thanks, I cannot get it to run with my vncviewer (TightVNC Viewer
version 1.3.9)
I am pleased to announce that Database Supported Haskell (DSH) has been
released on Hackage [1].
DSH is a Haskell library for database-supported program execution. Using this
library a relational database management system (RDBMS) can be used as a
coprocessor for the Haskell programming language,
Thanks, I cannot get it to run with my vncviewer (TightVNC Viewer
version 1.3.9)
How should I call vncviewer and your Main binary?
./Main 200 200 5900
after this, the program should start listening to port 5900
You can check if things are fine by telneting to localhost:5900, you should
Am 03.02.2011 18:05, schrieb C K Kashyap:
ck@ck-desktop:~/lab/Chitra$ telnet localhost 5900
Trying ::1...
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
RFB 003.003
After this, you can use vncviewer to connect to localhost (5900 is the
default port for vnc)
Right,
Maybe these messages are also important?
Client Said :: RFB 003.003
Sharing enabled
SET PIXEL FORMAT called
bpp = 32
depth = 24
big endian = 0
trueColor = 1
RED MAX = 255
GREEN MAX = 255
blueMax = 255
red shift = 16
green shift = 8
blue shift = 0
SetEncodings Command
14
0
I need help with two functionsfirst this is the curent code
:http://pastebin.com/UPATJ0r
-Function 1)removeTautologies :: Formula-Formula
If in a clause, a literal and its negation are found, it means that the clause
will be true, regardless of the value
finally assigned to that
Just out of curiosity, has anyone gotten this to work? I'm getting bus errors
whenever I call readImage.
If anyone out there has gotten it working and would tell me which versions
they're using of the relevant bits, that would be very much appreciated. Also,
I'll post all my debug info if
On 3 February 2011 18:33, Manolache Andrei-Ionut andressocrate...@yahoo.com
wrote:
first this is the curent code :http://pastebin.com/UPATJ0r
There is no code on that page. (It has expired, probably?)
--
Ozgur Akgun
___
Haskell-Cafe mailing list
Given the first program, it seems that the unchanging first element of the
tuple could be handled by a Reader monad, leading to the second program, where
b becomes the state, but how do I get the constant a from the Reader monad?
Michael
==
import Control.Monad.State
type
Is the idea here merely an exercise in using the state monad? This can be
easily performed using pure code.
Bob
On 3 Feb 2011, at 19:18, michael rice wrote:
Given the first program, it seems that the unchanging first element of the
tuple could be handled by a Reader monad, leading to the
On Thursday 03 February 2011 20:18:43, michael rice wrote:
Given the first program, it seems that the unchanging first element of
the tuple could be handled by a Reader monad, leading to the second
program, where b becomes the state, but how do I get the constant a from
the Reader monad?
You
On 3 February 2011 19:18, michael rice nowg...@yahoo.com wrote:
but how do I get the constant a from the Reader monad?
http://hackage.haskell.org/packages/archive/transformers/latest/doc/html/Control-Monad-Trans-Reader.html#v:ask
You also need to change the type to use ReaderT.
--
Ozgur
(CCing haskell-cafe again)
Is this an homework question?
On 3 February 2011 20:30, Manolache Andrei-Ionut andressocrate...@yahoo.com
wrote:
http://pastebin.com/GxQBh3hx http://pastebin.com/GxQBh3hx
--- On *Thu, 2/3/11, Ozgur Akgun ozgurak...@gmail.com* wrote:
From: Ozgur Akgun
Hi Daniel,
Ok, but what I was looking for was ReaderT on top, State on the bottom. This is
very confusing material, with no apparent conceptual commonality (ad hoc comes
to mind) among the many examples I've looked at. Sometimes lift is used, other
times a lift helper function, and in this
Dear cafe,
does anyone have an explanation for this?:
error (error foo)
*** Exception: foo
error $ error foo
*** Exception: *** Exception: foo
-- Steffen
___
Haskell-Cafe mailing list
Haskell-Cafe@haskell.org
A project...this are my last questions,I'm not proeficient in haskell...this
explains why Im stuck... http://pastebin.com/GxQBh3hx
--
View this message in context:
http://haskell.1045720.n5.nabble.com/Haskell-Functions-tp3369769p3369938.html
Sent from the Haskell - Haskell-Cafe mailing list
There now follows a small grab-bag of miscelaneous but related thoughts.
(Which probably means that this post will spawn a 2000 message thread
discussing one tiny side-issue, rather than the main thrust of the
message...)
First of all, benchmarking. We have The Great Language Shootout,
On Thursday 03 February 2011 21:40:13, michael rice wrote:
Hi Daniel,
Ok, but what I was looking for was ReaderT on top, State on the bottom.
No problem, just change the definition of the Heron type synonym and swap
the applcations of runReader[T] and evalState[T] in mySqrt, the monadic
On 3/02/2011, at 8:18 PM, Navin Rustagi wrote:
hi ,
I am stuck in the following problem.
I am maintaining a list of tuples of the form
([Char],Int,Int, Int,Int) . The purpose of maintaining the tuples is that the
program reads from a file line by line , Matches the contents with
On Thursday 03 February 2011 21:37:45, Ozgur Akgun wrote:
(CCing haskell-cafe again)
Is this an homework question?
I think so: http://stackoverflow.com/questions/4877486/haskell-procedure
www.inf.ed.ac.uk/teaching/courses/inf2d/.../Inf2d-09-Assignment1.pdf
On Thu, Feb 3, 2011 at 2:44 PM, Steffen Schuldenzucker
sschuldenzuc...@uni-bonn.de wrote:
Dear cafe,
does anyone have an explanation for this?:
error (error foo)
*** Exception: foo
error $ error foo
*** Exception: *** Exception: foo
I don't know if this is relevant, but I thought that
This is indeed very strange. On my latest GHC 7 (built a couple of days ago)
it does the right thing when compiled, but in GHCi it behaves as you
describe. I have no idea, frankly.
On Thu, Feb 3, 2011 at 8:44 PM, Steffen Schuldenzucker
sschuldenzuc...@uni-bonn.de wrote:
Dear cafe,
does
To illustrate your prediction about the side-issues:
On Thursday 03 February 2011 22:10:51, Andrew Coppin wrote:
Consider for a moment the original implementation with Data.Map. Adding
a seq or two here will do no good at all; seq reduces to WHNF. What we
are wanting is NF, and I can see no
And swap the arguments.
Thanks for going the extra mile.
Michael
--- On Thu, 2/3/11, Daniel Fischer daniel.is.fisc...@googlemail.com wrote:
From: Daniel Fischer daniel.is.fisc...@googlemail.com
Subject: Re: [Haskell-cafe] Reader monad wrapping State monad
To: michael rice
On Thu, Feb 3, 2011 at 12:44 PM, Steffen Schuldenzucker
sschuldenzuc...@uni-bonn.de wrote:
Dear cafe,
does anyone have an explanation for this?:
error (error foo)
*** Exception: foo
error $ error foo
*** Exception: *** Exception: foo
Have you read the intermediate Core (using
On Thu, Feb 3, 2011 at 10:43 AM, Max Cantor mxcan...@gmail.com wrote:
Just out of curiosity, has anyone gotten this to work? I'm getting bus
errors whenever I call readImage.
If anyone out there has gotten it working and would tell me which versions
they're using of the relevant bits, that
catamorphism:
On Thu, Feb 3, 2011 at 12:44 PM, Steffen Schuldenzucker
sschuldenzuc...@uni-bonn.de wrote:
Dear cafe,
does anyone have an explanation for this?:
error (error foo)
*** Exception: foo
error $ error foo
*** Exception: *** Exception: foo
Have you read the
This is probably a result of strictness analysis. error is
technically strict, so it is reasonable to optimize to:
let e = error foo in e `seq` error e
On Thu, Feb 3, 2011 at 1:44 PM, Steffen Schuldenzucker
sschuldenzuc...@uni-bonn.de wrote:
Dear cafe,
does anyone have an explanation
On 03/02/2011 09:37 PM, Daniel Fischer wrote:
To illustrate your prediction about the side-issues:
On Thursday 03 February 2011 22:10:51, Andrew Coppin wrote:
Consider for a moment the original implementation with Data.Map. Adding
a seq or two here will do no good at all; seq reduces to WHNF.
On Thu, Feb 3, 2011 at 2:03 PM, Luke Palmer lrpal...@gmail.com wrote:
This is probably a result of strictness analysis. error is
technically strict, so it is reasonable to optimize to:
let e = error foo in e `seq` error e
Yes, and you can see this in the Core code that Don posted: in
Hi,
Thanks for bringing up these issues. It's something we could be better
at addressing as a community.
First, we need to stop pretending that you can use Haskell effectively
without first learning to reason about program evaluation order.
Learning how is not terrible difficult, but there's
On Thu, Feb 3, 2011 at 11:10 PM, Andrew Coppin
andrewcop...@btinternet.com wrote:
Wouldn't that still mean that the spine of the map is still lazy though?
No, Data.Map and Data.Set are both spine strict (which should be
documented!). Data.Map is key strict in addition. Both are value lazy.
Hi,
For what it's worth I saw the problems in your counting examples right
away, without reading the explanatory text below. Hopefully that means
that it's possibly to learn how to spot such things without resorting
to e.g. running the program or reading Core *gasp*.
Johan
On Thursday 03 February 2011 23:03:36, Luke Palmer wrote:
This is probably a result of strictness analysis. error is
technically strict, so it is reasonable to optimize to:
let e = error foo in e `seq` error e
I think so too.
Unoptimised,
module Errors where
foo = error (error foo)
On Thursday 03 February 2011 23:19:31, Johan Tibell wrote:
Hi,
For what it's worth I saw the problems in your counting examples right
away, without reading the explanatory text below.
Yes, they were pretty obvious with enough experience. For beginners I
expect it to be a rather insidious
On 4/02/2011, at 10:10 AM, Andrew Coppin wrote:
The important obsevation is this: One tiny, almost insignificant change can
transform a program from taking 50 seconds and 400 MB of RAM into one that
takes 0.02 seconds and 0.1 MB of RAM. And, at least in this case, the simpler
version is
On Thursday 03 February 2011 5:12:54 PM Tim Chevalier wrote:
On Thu, Feb 3, 2011 at 2:03 PM, Luke Palmer lrpal...@gmail.com wrote:
This is probably a result of strictness analysis. error is
technically strict, so it is reasonable to optimize to:
let e = error foo in e `seq` error e
In general, errors are always interchangeable with another. An
exception in haskell is a value, rather than an event. Haskell
prescribes no evaluation order other than if the result is defined it
must be equivalant to the one generated by a normal-order reduction
strategy. Since error is not a
Thanks to all of you for making GHC's behaviour yet a bit clearer to me.
On 02/03/2011 11:25 PM, Daniel Fischer wrote:
On Thursday 03 February 2011 23:03:36, Luke Palmer wrote:
This is probably a result of strictness analysis. error is
technically strict, so it is reasonable to optimize
Daniel Fischer wrote:
On Thursday 03 February 2011 23:19:31, Johan Tibell wrote:
Hi,
For what it's worth I saw the problems in your counting examples right
away, without reading the explanatory text below.
Yes, they were pretty obvious with enough experience. For beginners I
expect
-BEGIN PGP SIGNED MESSAGE-
Hash: SHA1
On 2/2/11 20:06 , wren ng thornton wrote:
When I put this all together, the process is killed with:
control message: Just (Err endOfInput)
POSIX FIFOs and GHC's nonblocking file descriptors implementation don't play
well together; you should
I'd like to use AES in a haskell program that I'm writing. I've come
across three libraries in hackage that do AES: the library named AES,
the Crypto library, and the SimpleAES library. The library named AES
says in its documentation for the crypt function that it is not
thread-safe. What
-BEGIN PGP SIGNED MESSAGE-
Hash: SHA1
On 2/3/11 19:16 , Brandon S Allbery KF8NH wrote:
POSIX FIFOs and GHC's nonblocking file descriptors implementation don't play
well together; you should launch the writer end first and let it block
More specifically, I think what's happening here is
On 2/3/11 8:05 AM, John Lato wrote:
I don't have too much to add to Maciej and Oleg's reply, except that I'd
recommend looking at the Wave codec over the Tiff reader in those versions
of iteratee. I don't think that's the only problem, though, because then
you'd be getting a Divergent iteratee
On 2/3/11 10:48 AM, Max Cantor wrote:
Does it make sense to relegate OSX x86_64 to community status
while the 32-bit version is considered a supported platform?
I'm not sure I can make sense of what you mean here. Given the preamble,
I'd guess you're asking whether we should make x86_64 the
On 2/3/11 7:19 PM, Brandon S Allbery KF8NH wrote:
-BEGIN PGP SIGNED MESSAGE-
Hash: SHA1
On 2/3/11 19:16 , Brandon S Allbery KF8NH wrote:
POSIX FIFOs and GHC's nonblocking file descriptors implementation don't play
well together; you should launch the writer end first and let it block
On 4/02/2011, at 2:14 PM, wren ng thornton wrote:
On 2/3/11 10:48 AM, Max Cantor wrote:
Does it make sense to relegate OSX x86_64 to community status
while the 32-bit version is considered a supported platform?
I'm not sure I can make sense of what you mean here. Given the preamble, I'd
I'm not sure I can make sense of what you mean here. Given the preamble, I'd
guess you're asking whether we should make x86_64 the targeted architecture
for OSX support, and reclassify 32-bit OSX to unsupported or hopefully it
still works status. (But in that case, it's the 32-bit which
Max Cantor wrote:
someone? wrote:
I think the original poster is saying that the targeted architecture for OS X
support
should be the architecture that OS X assumes by default, and these days that's
x86_64.
That sounds reasonable to me. The big caveat is that OSX = 10.5.8
10.6 should
Doesn't 10.5.x have the ability to generate and run 64-bit binaries?
mc
On Feb 4, 2011, at 10:19 AM, wren ng thornton wrote:
Max Cantor wrote:
someone? wrote:
I think the original poster is saying that the targeted architecture for OS
X support
should be the architecture that OS X assumes
Wholly support moving OSX to x64. x86 should be supported only on a
best effort basis for legacy.
Steve
On Thu, Feb 3, 2011 at 6:28 PM, Max Cantor mxcan...@gmail.com wrote:
Doesn't 10.5.x have the ability to generate and run 64-bit binaries?
mc
On Feb 4, 2011, at 10:19 AM, wren ng thornton
On 2/3/11 9:28 PM, Max Cantor wrote:
Doesn't 10.5.x have the ability to generate and run 64-bit binaries?
Yes, it does. But it defaults to 32-bit as I recall. Richard O'Keefe
suggested a general practice of targeting the architecture considered
default by the operating system. That's a good
Thanks, Daniel. I'm still stumped. When I say
#include B.hs
in a .hs file, all works fine, but when in a .lhs file I get error: B.hs:
No such file or directory. The file B.hs is in the same directory as the
including file, which is the current directory for ghci. Same situation with
ghc.
If I
My guess (a complete guess) is that the deliterate step is creating a
temporary .hs file elsewhere on your filesystem, which is why the CPP
step can't find B.hs without a fully-qualified path.
Michael
On Fri, Feb 4, 2011 at 6:56 AM, Conal Elliott co...@conal.net wrote:
Thanks, Daniel. I'm still
Hi everyone,
Does anyone else have trouble installing the AES package on a 32-bit
system? My system at home installs it just fine, but my VPS chokes
with the following error messages (plus a bunch of warnings):
cbits/ctr_inc.c:11:0:
error: 'uint_64t' undeclared (first use in this function)
Knowing nothing about the package or its code, it looks like a typo to me.
The stdint.h naming of types would have it be uint64_t, not uint_64t. Could
that be it?
On Fri, Feb 4, 2011 at 6:00 AM, Michael Snoyman mich...@snoyman.com wrote:
Hi everyone,
Does anyone else have trouble installing
Wow, I thought I'd tried that before, I guess not. Yes, that compiles,
and an initial test seems that it does not break at runtime either.
I'll email the author and see if he can make that change.
Michael
On Fri, Feb 4, 2011 at 8:11 AM, Daniel Peebles pumpkin...@gmail.com wrote:
Knowing nothing
FrameBufferUpdateRequest x=0, y=0 width =1, height=1
FrameBufferUpdateRequest x=1, y=0 width =99, height=1
FrameBufferUpdateRequest x=0, y=1 width =100, height=99
Main: socket: 7: hPutBuf: resource vanished (Connection reset by peer)
I was not taking care of partial updates, I've taken care
On Feb 3, 2011, at 5:55 PM, Max Cantor wrote:
Yes. I'm saying that I believe that OSX x86_64 should be the officially
supported platform instead of 32-bit x86 with all the associated guarantees
and assurances. I wanted to see how people felt about that.
I don't think this is such a good
zen:~# cabal install wxcore --enable-documentation --global
Resolving dependencies...
[1 of 1] Compiling Main (
/tmp/wxcore-0.12.1.617977/wxcore-0.12.1.6/Setup.hs,
/tmp/wxcore-0.12.1.617977/wxcore-0.12.1.6/dist/setup/Main.o )
Linking
On Thu, Feb 3, 2011 at 11:40 PM, Richard O'Keefe o...@cs.otago.ac.nz wrote:
Back in the days when systems other than Wintel and maybe sort of intel Linux
were
supported by Clean, I used to really love one of the features of the Clean
compiler.
One simple command line switch and the compiler
On Fri, Feb 4, 2011 at 12:38 AM, Erik de Castro Lopo
mle...@mega-nerd.com wrote:
However, one of the Haskell projects I work on is Ben Lippmeier's
DDC compiler. Thats about 5 lines of Haskell code and finding
performance issues there is really difficult.
Right. It can still be tricky. I
Can you just wrap it? Something like this:
-- put your monad type here
type M a = Iteratee ... a
data W a = W (Iteratee ... a) deriving Typeable
unW (W x) = x
toDynW :: Typeable a = M a - Dynamic
toDynW x = toDynamic (W x)
castM :: (Typeable x, Typeable a) = x - Maybe (M a)
castM = unW . cast
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