On Mon, Jan 14, 2013 at 7:09 PM, Simon Peyton-Jones
simo...@microsoft.comwrote:
Friends
** **
I’d like to propose a way to “promote” newtypes over their enclosing
type. Here’s the writeup
http://hackage.haskell.org/trac/ghc/wiki/NewtypeWrappers
** **
Any
On Thu, Feb 23, 2012 at 10:27 PM, Johan Tibell johan.tib...@gmail.com wrote:
The 64-bit version work so I guess that means that a 32-bit GHC/64-bit
OS combination only works on OS X?
Did you get it working on linux?
I'm getting the same error myself:
...
ghc-cabal: Bad interface file:
On Sun, Sep 16, 2012 at 5:49 PM, Simon Peyton-Jones
simo...@microsoft.com wrote:
[...]
Type inference
~
I'm a little unclear about the implications for inference. One route
might be this. Suppose we are trying to solve a constraint
[W] (a:'(k1,ks)) ~ '( t1, t2 )
where a is
I've pushed the discussed changes to the repo[1], it'd be good if you
(and other users) could test them before they get to hackage.
[1] darcs get http://patch-tag.com/r/Saizan/syb-with-class/
-- Andrea
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(s :: *) (t :: *). s :=: t
s_eq_t = cong_Bad (trans refl_Any eta)
subst :: x :=: y - x - y
subst Refl x = x
coerce :: s - t
coerce = subst s_eq_t
{-
GHCi, version 7.7.20120830: http://www.haskell.org/ghc/ :? for help
*Main coerce (4.0 :: Double) :: (Int,Int)
(Segmentation fault
-}
-- Andrea
hack
in ghc-7.4.1 to get the instance to typecheck, so we could side-step
the issue entirely by removing it from the generated code.
-- Andrea Vezzosi
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On Mon, Sep 3, 2012 at 2:53 PM, Roman Cheplyaka r...@ro-che.info wrote:
* Andrea Vezzosi sanzhi...@gmail.com [2012-09-03 12:50:03+0200]
[...]
This is pretty similar to what ended up being a ghc bug, fixed in 7.0 though:
http://hackage.haskell.org/trac/ghc/ticket/3731
The difference between
On Tue, Jun 14, 2011 at 4:40 PM, Dan Doel dan.d...@gmail.com wrote:
On Tue, Jun 14, 2011 at 5:36 AM, Simon Peyton-Jones
simo...@microsoft.com wrote:
There was an interesting thread on haskell-prime [1], about the relationship
between functional dependencies and type families. This message is
On Sun, Jan 9, 2011 at 7:45 AM, Sebastian Fischer fisc...@nii.ac.jp wrote:
[...]
Only conversion to the underlying Set type requires an Ord constraint.
getSet :: Ord a = Set a - S.Set a
getSet a = a - S.singleton
this unfortunately also means that duplicated elements only get
filtered
On Tue, Aug 17, 2010 at 8:54 PM, Dan Knapp dan...@gmail.com wrote:
Below, please find a snippet from a program I'm working on, and the
error it produces. I was told in #haskell that this was pretty
suspect and could conceivably be a ghc bug. So I'm reporting it
here. I'd also be grateful
On Thu, May 13, 2010 at 8:13 PM, wren ng thornton w...@freegeek.org wrote:
Andrea Vezzosi wrote:
On Thu, May 13, 2010 at 10:51 AM, wren ng thornton w...@freegeek.org
wrote:
Andrea Vezzosi wrote:
wren ng thornton wrote:
With this change [1] I can't notice any difference for your
On Thu, May 13, 2010 at 10:51 AM, wren ng thornton w...@freegeek.org wrote:
Andrea Vezzosi wrote:
wren ng thornton wrote:
With this change [1] I can't notice any difference for your benchmark[2].
Then again, all the runTest calls take 0 msec and I've had no luck making
the computation take
On Wed, May 12, 2010 at 7:50 AM, wren ng thornton w...@freegeek.org wrote:
wren ng thornton wrote:
Here's one big difference:
newtype ErrCPS e m a = ErrCPS { runErrCPS ::
forall r . (e - m r) -- error handler
- (a - m r) -- success handler
- m r }
The analogous version I use
On Mon, Dec 7, 2009 at 3:38 PM, David Fox dds...@gmail.com wrote:
On Sat, Dec 5, 2009 at 2:38 AM, Andrea Vezzosi sanzhi...@gmail.com wrote:
On Fri, Dec 4, 2009 at 8:51 PM, Jeremy Shaw jer...@n-heptane.com wrote:
I have stripped things down to the bare minimum, and test under GHC 6.10,
GHC 6.12
On Fri, Dec 4, 2009 at 8:51 PM, Jeremy Shaw jer...@n-heptane.com wrote:
I have stripped things down to the bare minimum, and test under GHC 6.10,
GHC 6.12, Linux, and Mac OS X. Results are consistent.
In the following code,
1. if you load the code into ghci and evaluate e it will hang, but
On Mon, Oct 12, 2009 at 6:43 PM, Christian Maeder
christian.mae...@dfki.de wrote:
Hi,
with
http://darcs.haskell.org/~ghc/dist/6.12.1rc1/ghc-6.12.0.20091010-i386-unknown-linux-n.tar.bz2
installed (under /local/maeder/) I get the following internal Haddock
or GHC error. I have no file
the bug about ^C (http://hackage.haskell.org/trac/ghc/ticket/3317)
doesn't look fixed to me, on amd64 linux.
sai...@astarte:~/cabal$ ~/bin/ghc --version
The Glorious Glasgow Haskell Compilation System, version 6.10.3.20090628
sai...@astarte:~/cabal$ ~/bin/ghc --make foo.hs
[1 of 1] Compiling Main
On Sun, Mar 22, 2009 at 12:51 PM, Colin Paul Adams
co...@colina.demon.co.uk wrote:
Achim == Achim Schneider bars...@web.de writes:
Achim Colin Paul Adams co...@colina.demon.co.uk wrote:
So why doesn't it find packages then, when they are installed?
Achim I've got no idea, what
I should clarify that cabal install --global won't see the packages
installed in the user db, even if not run as root.
But it at least will take into consideration the available packages'
cache and the config file in ~/.cabal/
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2009/3/6 Daryoush Mehrtash dmehrt...@gmail.com:
Two questions:
a) This chat server implementation doesn't actually close the connection
as a real one would need to do. If you use forever is there a way to end
the loop so as to end the connection?
Yes, throw an exception and catch it from
2009/2/22 Luke Palmer lrpal...@gmail.com:
On Sun, Feb 22, 2009 at 8:15 AM, John Meacham j...@repetae.net wrote:
On Sun, Feb 22, 2009 at 03:36:34PM +0100, Peter Verswyvelen wrote:
Would it be possible to separate the frontend (Haskell to Core) and
backend
(Core to machine code) from the
the solution here is to compile Setup.hs with ghc first, i.e. ghc
--make Setup.hs and then use the produced Setup.exe, this is also
recommended un linux since runghc will have to load and interpret many
modules if not.
However if you've already built cabal-install against 1.6.0.1 you can
simply
On Tue, Feb 17, 2009 at 11:50 PM, Achim Schneider bars...@web.de wrote:
Martin Huschenbett hus...@gmx.org wrote:
$ cabal install ghci-haskeline
Resolving dependencies...
cabal.exe: dependencies conflict: ghc-6.10.1 requires process
==1.0.1.1 however
process-1.0.1.1 was excluded because
with
haddock-2.x.
The solution is to do the pre-processing the same for haddock-0.x and
2.x. Generally the haddock code in Cabal is a horrible inconsistent
mess. I believe Andrea Vezzosi has been looking at rewriting it, which
is good news.
Duncan
Does it also let you apply a suggestion automatically?
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On Thu, Jan 8, 2009 at 5:25 AM, wren ng thornton w...@freegeek.org wrote:
The question for y'all is what should I call it? I've been calling the
template-function qaf (for Compiled Applicative Form ;) and the type class
with that function would be the only thing in the package, but I'm not
Tried running the program with +RTS -Nn where n = 2 or more? that should use
more OS threads
On Sun, Dec 21, 2008 at 10:43 PM, Günther Schmidt red...@fedoms.com wrote:
Hi,
in an application of mine I start a long-running operation in a thread via
forkIO so that the UI process doesn't get
If you want to defer the choice of 's' you've to make it appear in the type
signature of test1, so you've to introduce an artificial parameter even if
we're interested only in its type. e.g.:
data Proxy (s :: * - * - *) -- useful because we can't have an argument
of type 's' directly, since it's
It's more natural to consider the cross product of no sets to be [[]] so
your crossr becomes:
crossr [] = [[]]
crossr (x:xs) = concat (map (\h -map (\t - h:t) (crossr tail)) hd)
which we can rewrite with list comprehensions for conciseness:
crossr [] = [[]]
crossr (x:xs) = [ a:as | a - x, as
On Mon, Nov 24, 2008 at 7:40 AM, Andrea Vezzosi [EMAIL PROTECTED] wrote:
It's more natural to consider the cross product of no sets to be [[]] so
your crossr becomes:
crossr [] = [[]]
crossr (x:xs) = concat (map (\h -map (\t - h:t) (crossr tail)) hd
Ops, hd and tail should be x and xs here
I get the same behaviour, and when I open ghci in xterm and press Ctrl-D it
also echoes ^D before quitting, which is similar to the problem with
haskell-mode which seems to don't like the echoing of ^J from ghci when one
uses commands like C-u C-c C-t (which should copy the inferred type from the
I'd rather say that STM is intended to be used just for building up
transactions, not to model your whole process/thread, simply because in the
latter case your process couldn't have any observable intermediate state, or
put in another way, between any two transactions the information can only go
2008/10/9 Claus Reinke [EMAIL PROTECTED]
I was wondering if it was possible to implement synchronous channels
within STM. In particular, I'd like to have CSP-like send and recv
primitives
on a channel that each block until the other side arrives to complete
the transaction.
Assuming that
As i understand it, the monomorphism restriction applies to constrained
type variables, but c :: forall a. a, so it remains polymorphic and each of
its uses can be instantiated to a different type.
2007/12/25, Henning Thielemann [EMAIL PROTECTED]:
I thought I understand monomorphism
As a side note i'd like to point out that introspectData has a problem with
constructors containing Strings because show (x::String) /= x:
data Foo = Foo { bar :: String } deriving (Typeable,Data)
introspectData (Foo quux) -- [(bar,\quux\)]
Those extras \ don't look very nice in the xml.. (the
if by figure out you meant to do what tell does without using it, you
should have written:
foo = Writer ((),hello)
that would have had the right type, using return you are doing something
different.
in the Writer monad return :: Monoid w = a - Writer w a
so return ((),hello) :: Monoid w = Writer
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