On Wed, 26 Mar 2008, Ross Paterson wrote:
On Wed, Mar 26, 2008 at 08:52:43PM +, Ganesh Sittampalam wrote:
I'm a bit confused about why the following program doesn't compile (in
any of 6.6.1, 6.8.1 and 6.9.20080316). Shouldn't the Ord (a, b) context
be reduced?
To use bar, you need (Ord
Hi,
I have a problem in GHC 6.10 with functions in a class instance calling
other functions in the same class instance. It seems that the dictionary
is freshly constructed for this call, despite being already available.
The reason I care is that I want to memoise some expensive computations
Hi,
I recently spent a while debugging a problem where a program deadlocked in
the non-threaded runtime, but ran fine in the threaded runtime, despite
the program having no blocking FFI calls, and boiled it down to the
following test case:
module Main(main) where
import System
import
On Tue, 23 Jun 2009, Brandon S. Allbery KF8NH wrote:
On Jun 23, 2009, at 09:41 , Simon Marlow wrote:
main = do
(ih, oh, _, _) - runInteractiveProcess cat [] Nothing Nothing
comphszp - hGetContents oh
print (length comphszp)
-- hClose ih -- with this line they both deadlock
Note that you can
[ 6 of 10] Compiling Data.Array.IO( Data/Array/IO.hs,
dist/build/Data/Array/IO.o )
Data/Array/IO.hs:73:13:
`haFD' is not a (visible) field of constructor `Handle__'
Data/Array/IO.hs:73:22:
`haBuffer' is not a (visible) field of constructor `Handle__'
Data/Array/IO.hs:73:36:
On Fri, 30 Oct 2009, Sittampalam, Ganesh wrote:
Simon Peyton-Jones wrote:
Fortunately, I don't think a lot of people use the feature in anger.
Please yell if you *are* using impredicative polymorphism for
something serious. But if you are, we need to think of a workaround.
The current
On Sun, 26 Sep 2010, Ian Lynagh wrote:
We are pleased to announce the first release candidate for GHC 7.0.1:
http://new-www.haskell.org/ghc/dist/7.0.1-rc1/
This includes the source tarball, installers for OS X and Windows, and
bindists for amd64/Linux and i386/Linux.
Please test as much
Hi Neil,
On Tue, 2 Nov 2010, Neil Mitchell wrote:
Make sure you are using RC2 of the compiler, from what I remember RC1
required signatures it shouldn't have, or enabled MonoLocalBinds more
than it should - RC2 required less signatures. However, your code
could well just be heavily using the
On Mon, 6 Dec 2010, Simon Peyton-Jones wrote:
I too wish there was a good solution here. I've taken to making dated repos,
thus
http://darcs.haskell.org/ghc-new-co-17Nov10
When it becomes unusable, I make a brand new repo, with a new date
starting from HEAD, pull all the old
On Thu, 9 Dec 2010, Simon Marlow wrote:
On 08/12/2010 17:39, Yitzchak Gale wrote:
Some of those are already in the works, and all except possibly
(5) are known to be within reach. So the answer is yes, this
problem is now on the verge of being solved in Darcs.
I think that might be a little
On Wed, 8 Dec 2010, Stephen J. Turnbull wrote:
Ganesh Sittampalam writes:
I think there are three things that can help with this problem:
1) a darcs rebase command. This will give you a nice way to manage the
workflow already discussed, and you won't have to squish everything
through
Hi Simon,
You talk about the timing of application of the instance declaration
instancePatchInspect (PrimOf p)) = Conflict p
but the constraint is actually defined in the class declaration, and I
don't have any instance declarations for Conflict p itself.
classPatchInspect (PrimOf p)) =
in the meanwhile?
Or I will do it tomorrow.
Thanks!
d-
*From:* glasgow-haskell-users-boun...@haskell.org
[glasgow-haskell-users-boun...@haskell.org] on behalf of Ganesh
Sittampalam [gan...@earth.li]
*Sent:* Friday
On 11/05/2011 10:33, Yitzchak Gale wrote:
Don Stewart wrote:
The haskell.org committee... has decided to
incorporate haskell.org as a legal entity. This email outlines our
recommendation, and seeks input from the community on this decision.
Thanks, good news! And thanks for posting to
Hi,
It would be useful to access the current compilation parameters or even
an entire RunGhc monad from inside a Template Haskell splice. Is there
any way to do this?
The reason I want to do this is I'm using the ghc API at runtime to
dynamically execute code, and I want both the dynamically
On 15/09/2011 15:43, Ian Lynagh wrote:
On Thu, Sep 15, 2011 at 08:47:30AM +, Simon Peyton-Jones wrote:
Provoked the (very constructive) Yesod blog post on Limitations of
Haskell, and the follow up discussion, I've started a wiki page to collect
whatever ideas we have about the name
Hi,
The following either eats memory until killed or segfaults (I can't pin
down a reason for the difference). Tested with GHC 6.2.2 and 6.4.20050212,
with various different libgmp3s under various Redhat and Debian platforms,
and WinXP.
Prelude :m +Data.Bits
Prelude Data.Bits
On Mon, 28 Feb 2005, Remi Turk wrote:
On Mon, Feb 28, 2005 at 02:55:56PM +, Ganesh Sittampalam wrote:
Prelude :m +Data.Bits
Prelude Data.Bits 18446658724119492593 `shiftL` (-3586885994363551744) ::
Integer
and calculating, in your case, 2^3586885994363551744 is not
something your
Hi,
I'm having some trouble writing code that uses GADTs. I finally got
something that is portable between GHC 6.6 and 6.8, but I don't really
understand what's going on, and I'm a bit unhappy with the number of type
signatures required.
I'll explain them with a series of cut-down examples
On Wed, 21 Nov 2007, Alex Jacobson wrote:
Simon Marlow wrote:
Alex Jacobson wrote:
1. just using : at the prompt caused a reload. Now you have to type :r.
Interesting, I was not aware of that behaviour, so probably fixed it by
accident :)
Yeah, Igloo said the same thing. Everyone I
Hi,
I'm trying to understand what fundeps do and don't let me do. One
particular source of confusion is why the following program doesn't
typecheck:
{-# LANGUAGE MultiParamTypeClasses, FunctionalDependencies #-}
module Fundeps where
class Dep a b | a - b, b - a
conv :: (Dep a b1,Dep a b2)
On Mon, 3 Dec 2007, Simon Peyton-Jones wrote:
No, you didn't miss anything. I wouldn't expect anyone to write these
types directly. But it can happen:
class C a b | a-b
instance C Int Bool
class D x where
op :: forall y. C x y = x - y
instance D Int
Hi,
I notice that the readline package is missing from the Windows MSI build
of GHC 6.0.1. Is this deliberate and/or a fundamental limitation of the
Windows platform? Would I have to/be able to make my own Cygwin-based
build to get it?
Cheers,
Ganesh
in *practice*! Q more or less *is* TcM.
Still I don't really know how to get around this in a beautiful way.
Simon
| -Original Message-
| From: glasgow-haskell-users-boun...@haskell.org
[mailto:glasgow-haskell-users-
| boun...@haskell.org] On Behalf Of Ganesh Sittampalam
| Sent
Hi,
I'm just investigating what we can do about a problem with darcs'
handling of non-ASCII filenames on GHC 7.2.
The issue is apparently that as of GHC 7.2, getDirectoryContents now
tries to decode filenames in the current locale, rather than converting
a stream of bytes into characters:
Hi Max,
On 01/11/2011 10:23, Max Bolingbroke wrote:
This is my implementation of Python's PEP 383 [1] for Haskell.
IMHO this behaviour is much closer to what users expect.For example,
getDirectoryContents . = print shows Unicode filenames properly.
As a result of this change we were able
Hi,
I'm not entirely clear on what the overall situation will be once Simon
M's patch to add .ByteString versions to unix is added in GHC 7.4.1.
In particular the original problem darcs ran into was with
getDirectoryContents in the directory package. That in turn uses the
unix package on Posix
Hi,
As mentioned in the committee's annual report
(http://haskellorg.wordpress.com/2011/10/26/first-year-report/), our
attempt to join SFC has stalled because they don't have the capacity to
accept new projects at the moment.
We therefore applied to join SPI (http://www.spi-inc.org/), and they
BTW as with the Don's original message about incorporating, I
distributed this widely to increase awareness, but please restrict any
feedback to haskell-cafe@ and committee@.
Sorry for the noise!
Ganesh
On 16/12/2011 09:08, Ganesh Sittampalam wrote:
Hi,
As mentioned in the committee's
On 23/12/2011 13:46, Ian Lynagh wrote:
On Fri, Dec 23, 2011 at 01:34:49PM +, Simon Peyton-Jones wrote:
Arguments Boxed Unboxed
3 ( , , )(# , , #)
2 ( , ) (# , #)
1
0 () (# #)
Simple, uniform.
Uniform
Hi,
I'm having some trouble making Haskell bindings to libsane (a scanner
access library: http://www.sane-project.org/)
When I build the cut down sample of my code (below) with GHC 7.4.1 with
the non-threaded runtime, it hangs at runtime in the call to
c'sane_get_devices (after printing go).
On 07/06/2012 12:08, Simon Marlow wrote:
I don't completely understand what is going wrong here, but it looks
like an interaction between the RTS's use of a timer signal and the
libsane library. You can make it work by turning off GHC's timer with
+RTS -V0.
[..]
The signal has always been
On 17/08/2012 11:18, Simon Peyton-Jones wrote:
| Would it be reasonable to change ghc's behavior to treat this
| (ie an 'import' statement that hides something that isn't exported) as a
| warning instead of an error?
Yes, that would be easy if it's what everyone wants. Any other opinions?
Hi,
I'm getting the panic below when building darcs 2.8 with GHC 7.6. It'll
take some effort to cut it down or give repro instructions for an
uncut-down version (I needed to hack a lot of underlying packages to be
able to even get as far as doing this build), so could someone confirm
that it's
-
| haskell-users-boun...@haskell.org] On Behalf Of Ganesh Sittampalam
| Sent: 22 August 2012 06:32
| To: glasgow-haskell-users@haskell.org
| Subject: 7.6.1 RC1 panic coVarsOfTcCo:Bind
|
| Hi,
|
| I'm getting the panic below when building darcs 2.8 with GHC 7.6. It'll
| take some effort
On 01/10/2012 12:05, Simon Marlow wrote:
This probably means that you have packages installed in your ~/.cabal
from a 32-bit GHC and you're using a 64-bit one, or vice-versa. To
avoid this problem you can configure cabal to put built packages into a
directory containing the platform name.
On 28/11/2012 13:13, Ian Lynagh wrote:
My general feeling about Windows is that it's ok for the end result to
be a little annoying, because Windows DLLs *are* annoying and it's
nothing to do with GHC.
In particular I think in practice most Windows developers will have
admin rights and could
On 10/02/2013 21:43, Ian Lynagh wrote:
On Sun, Feb 10, 2013 at 09:30:23PM +, Simon Peyton-Jones wrote:
| You may ask what use is a GHC release that doesn't cause a wave of
updates?
| And hence that doesn't work with at least some libraries. Well, it's a
very useful
| forcing
Hi,
It seems that from GHC 7.4, the prohibition on implicit parameter
constraints in instance declarations has been relaxed. The program below
gives the error Illegal constraint ?fooRev::Bool in GHC 7.2.1 but
loads fine in GHC 7.4.2 and GHC 7.6.2.
I can't spot anything about this in the release
Is it possible to tie the role to whether the data constructor is
visible or not?
On 07/10/2013 14:26, Richard Eisenberg wrote:
As you may have heard, /roles/ will be introduced with GHC 7.8. Roles
are a mechanism to allow for safe 0-cost conversions between newtypes
and their base types.
I think it would be ok to expect the constructors to be visible, even
though it might need to a lot being needed.
BTW I think you might need S1 visible as well otherwise how would you
convert (S1 True :: S Bool Int) into (S1 True :: S Bool Age)?
If you don't derive the role from constructor
I feel this blurs the roles of GHC and the Platform.
Can't the cabal-install that comes with the Platform can be used with a
later GHC installation? If that's correct, then the only use case that
this proposal covers is someone who wants to use a bleeding edge GHC and
no other version on a new
releases. Ideally the binaries could be
produced on a build bot. The very least we should have the Makefile in
the cabal repo being able to create the binary in a reproducible manner.
-- Johan
On Tue, Jan 21, 2014 at 11:22 AM, Ganesh Sittampalam gan...@earth.li
mailto:gan...@earth.li wrote
Just to note a problem I encountered on Windows, which may well be user
error.
I unpacked the mingw tarball and added the bin directory from it to my
path. cabal install then failed with cabal.exe: does not exist after
producing some other output.
Running with -v3 suggested that the actual
The behaviour could be invoked only for lower-case parts, but that may
prove problematic on case-insensitive filesystems like Windows.
On 16/03/2014 13:52, Carter Schonwald wrote:
Idk, this behavior of doing Data.Vector.lhs seems pretty awesome. I
actually might start doing that. That ghc
On 23/04/2014 20:04, dm-list-haskell-librar...@scs.stanford.edu wrote:
Edward Kmett ekm...@gmail.com writes:
You can wind up in perfectly legitimate situations where the name for the
type you are working with isn't in scope, but where you can write a
combinator that would infer to have that
Hi,
The code below (also attached - unzip and run go.sh) triggers the GHC
panic "Simplifier ticks exhausted", and I'm unsure whether I should view
it as an instance of the known infelicity in the inliner
(https://downloads.haskell.org/~ghc/latest/docs/html/users_guide/bugs.html#bugs-ghc)
My code
47 matches
Mail list logo
