Hi Fabian,
In general, the behavior you get from hint should be more or less the same one
you would observe in ghci, the mapping being roughly:
loadModules ~~~ :load
setImports :module
In ghci, if you have a package installed (and is not hidden in your session),
then I believe you can
Hi Iavor,
On May 27, 2013, at 6:18 PM, Iavor Diatchki wrote:
Hello,
On Fri, May 24, 2013 at 12:42 AM, Daniel Gorín dgo...@dc.uba.ar wrote:
On May 24, 2013, at 9:28 AM, Simon Peyton-Jones wrote:
How about (in Haskell98)
module Data.List ( foldr, ...)
import qualified
should affect only the module system, where it is
determined what the type of an imported symbol is. In particular, the
typechecker would go unaware of it. In that sense, I see the proposal as a very
mild extension.
Thanks,
Daniel.
Simon
| -Original Message-
| From: Daniel Gorín
is to make Data.List reexport Data.Foldable.foldr (with a more
specialized type) so that the module above can be accepted.
Thanks,
Daniel
Simon
| -Original Message-
| From: glasgow-haskell-users-boun...@haskell.org [mailto:glasgow-haskell-
| users-boun...@haskell.org] On Behalf Of Daniel
Hi all,
Given the ongoing discussion in the libraries mailing list on replacing (or
removing) list functions in the Prelude in favor of the Foldable / Traversable
generalizations, I was wondering if this wouldn't be better handled by a mild
(IMO) extension to the module system.
In a
Hi Johannes,
The repository version of ghc-mtl already compiles with ghc 7.6.1. I'm working
at the moment on making hint compile again as well (am I the only one on this
list that doesn't get excited with every new release of ghc? :)), then I'll
upload both to hackage.
Thanks,
Daniel
On Oct
in a library (and
make sure that it is installed before running the program).
Hope this helps...
Daniel
On Mar 31, 2012, at 8:06 PM, Claude Heiland-Allen wrote:
Hi Daniel, cafe,
On 31/03/12 17:47, Daniel Gorín wrote:
Could you provide a short example of the code you'd like to write
On Sep 14, 2011, at 5:29 AM, Kazu Yamamoto (山本和彦) wrote:
Hello,
Of course, I use ByteString or Text for real programming. But I would
like to know whether or not there are any efficient methods to remove
a tail part of a list.
--Kazu
In that case, I would prefer this version, since it
Hi Romildo, you can try the darcs version of ghc-mtl [1], I don't know if that
will be enough to build lambdabot, though
Best,
Daniel
[1] http://darcsden.com/jcpetruzza/ghc-mtl
On Sep 7, 2011, at 1:34 PM, José Romildo Malaquias wrote:
Hello.
In order to compile ghc-mtl-1.0.1.0 (the latest
Hi Romildo, you can try the darcs version of ghc-mtl [1], I don't know if that
will be enough to build lambdabot, though
Best,
Daniel
[1] http://darcsden.com/jcpetruzza/ghc-mtl
On Sep 7, 2011, at 1:34 PM, José Romildo Malaquias wrote:
Hello.
In order to compile ghc-mtl-1.0.1.0 (the latest
On Jul 11, 2011, at 10:48 PM, Alistair Bayley wrote:
12 July 2011 05:49, Michael Snoyman mich...@snoyman.com wrote:
As for Bryan's resource-pool: currently I would strongly recommend
*against* using it for any purpose. It is based on
MonadCatchIO-transformers[2], which is a subtly broken
I think you need to change the type of putback slightly:
import Data.IORef
putback :: a - IO a - IO (IO a)
putback a action =
do next - newIORef a
return (do r - readIORef next; writeIORef next = action; return r)
main =
do getChar' - putback 'a' getChar
str - sequence $ take
Hi
I have code using the ghc-api that could be run in interactive mode prior to
version 7 but now makes ghci crash with a linker error. Everything works fine
if compiled before running. I don't know if this is a known issue or if I'm
just using the api in the wrong way, but I thought that I
Hi
I'm trying to make the hint library work also with ghc 7 and I'm having
problems with some test-cases that are now raising exceptions. I've been able
to reduce the problem to a small example. The program below runs ghc in
interpreter-mode and attempts to parse an statement using ghc's
I expect this one to run in constant space:
import Data.Bits
genbin :: Int - [String]
genbin n = map (showFixed n) [0..2^n-1::Int]
where showFixed n i = map (bool '1' '0' . testBit i) [n-1,n-2..0]
bool t f b = if b then t else f
Daniel
On Oct 15, 2010, at 9:43 AM, Eugene
I believe the way is done in hint is something like this (untested):
showType t =
do -- Unqualify necessary types
-- (i.e., do not expose internals)
unqual - GHC.getPrintUnqual
return $ GHC.showSDocForUser unqual (GHC.pprTypeForUser False
t) -- False means 'drop explicit
Hi Tom,
There is probably more than one way to do this. Did you try using the
package hint-server? [1] It has a very simple interface: you start a
server and obtain a handle; then you can run an interpreter action
using the handle. Something like this:
runIn handle (interpret msg (as
On May 9, 2010, at 12:32 AM, Tom Hawkins wrote:
I have a lot of structured data in a program written in a different
language, which I would like to read in and analyze with Haskell. And
I'm free to format this data in any shape or form from the other
language.
Could I define a Haskell type for
Hi, Martin
Do you have a complete example one can use to reproduce this behavior?
(preferably a short one! :P)
In any case, I'm resending your message to the glasgow-haskell-users
list to see if a ghc guru recognize the error message. It is strange
that the problem only manifests on
Hi, Martin
Do you have a complete example one can use to reproduce this behavior?
(preferably a short one! :P)
In any case, I'm resending your message to the glasgow-haskell-users
list to see if a ghc guru recognize the error message. It is strange
that the problem only manifests on
On Nov 11, 2009, at 5:39 AM, Martin Hofmann wrote:
I still have problems and your code won't typecheck on my machine
printing the following error:
[...]
I assume we are using different versions of some packages. Could you
please send me the output of your 'ghc-pkg list'.
Thanks,
Martin
On Sep 30, 2009, at 2:20 AM, Martin Hofmann wrote:
Thanks a lot.
You ought to be able to add a Control.Monad.CatchIO.catch clause to
your interpreter to catch this kind of errors, if you want.
I forgot to mention that this didn't work for me either.
Thanks for the report!
You are
On Sep 29, 2009, at 8:56 AM, Martin Hofmann wrote:
Hi,
The API of Language.Haskell.Interpreter says, that 'runInterpreter'
runInterpreter :: (MonadCatchIO m, Functor m) =
InterpreterT m a -
m (Either InterpreterError a)
returns 'Left' in case of errors and 'GhcExceptions from
On Jul 13, 2009, at 10:53 PM, Marc Weber wrote:
Yes, it is a known limitation. It ought to be documented somewhere.
There are two problems:
1. GHC is not thread-safe. [...]
2. There is only one RTS linker with a single symbol table. [...]
Are there already bug tracker items for these
Hi
I'm trying to use the GHC API to have several instances of GHC's
interpreter loaded simultaneously; each with its own loaded modules,
etc. However, this doesn't seem to work well when two instances have
loaded modules with the same name. I'm including the code of a
small(ish) example
should be done testing the solution
before I hit the send button... Cabal guys, you rock.
Thanks again, Dan.
/Joe
Daniel Gorín wrote:
Hi
Just a wild guess but maybe the interpreter is recompiling (in
runtime) code that has already been compiled to build your
application (in compile-time
Hi
Just a wild guess but maybe the interpreter is recompiling (in
runtime) code that has already been compiled to build your application
(in compile-time). This may lead to inconsistencies since a type such
as HackMail.Data.Main.Types.Filter may refer to two different (and
incompatible)
Hi
Just a wild guess but maybe the interpreter is recompiling (in
runtime) code that has already been compiled to build your application
(in compile-time). This may lead to inconsistencies since a type such
as HackMail.Data.Main.Types.Filter may refer to two different (and
incompatible)
to use it, I need
to not know it...
Perhaps, in fact, I'm doing this wrong. Thanks for the help Daniel,
everyone...
/Joe
Daniel Gorín wrote:
Ok, so I've pulled the latest version and the error I get now is:
Hackmain.hs:70:43:
Ambiguous type variable `a' in the constraint
Hi
I've downloaded Hackmain from patch-tag, but I'm getting a different
error. The error I get is:
Hackmain.hs:63:10:
No instance for (Data.Typeable.Typeable2
Control.Monad.Reader.Reader)
arising from a use of `interpret' at Hackmain.hs:63:10-67
Hint
instances in all the appropriate places. And provided a
(maybe incorrect? Though I'm fairly sure that shouldn't affect the
bug I'm having now) Typeable implementation for Reader, but I still
get this ambiguous type. I'll push the current version asap.
Thanks.
/Joe
Daniel Gorín wrote:
Hi
http://hackage.haskell.org/trac/ghc/ticket/2884
On Feb 9, 2009, at 10:53 AM, Wolfgang Jeltsch wrote:
Am Montag, 29. Dezember 2008 12:54 schrieb Simon Peyton-Jones:
What a great bug -- I would never have predicted it, but in
retrospect it
makes perfect sense. Record selectors had better get
On Feb 2, 2009, at 1:06 AM, Louis Wasserman wrote:
Is there any sensible way to make
newtype FooT m e = FooT (StateT Bar m e) deriving (MonadState)
work to give instance MonadState Bar (FooT m e)?
That is, I'm asking if there would be a semantically sensible way of
modifying
Hi
While trying to see if I could make some code run faster I stumbled
upon something that looks weird to me: 2x-3x performance loss when a
module is renamed to a longer name!
Here's what I see with the attached examples:
#diff long-modname-ver.hs short-modname-ver.hs
2c2
import
On Dec 15, 2008, at 10:43 PM, Don Stewart wrote:
dons:
Running time as a function of module name length,
http://galois.com/~dons/images/results.png
10 is the magic threshold, where indirections start creeping in.
Codegen cost heuristic fail?
Given this, could you open a bug ticket for
i would expect to get back the Error from the *first* function in the
sequence of functions in checkHeader (oggHeaderError from the
oggHeader
function). but instead i always see the Error from the *last* function
in the sequence, OggPacketFlagError from the OggPacketFlag function.
why
is
On Nov 21, 2008, at 2:04 PM, Jason Dagit wrote:
Hello,
[...]
My understanding was that from 6.6 to 6.8, GADT type checking was
refined to fill some gaps in the soundness. Did that happen again
between 6.8 and 6.10 or is 6.10 being needlessly strict here?
Thanks,
Jason
typing rules for
On Oct 25, 2008, at 8:39 PM, Anatoly Yakovenko wrote:
so I am trying to figure out how to use ghc as a library. following
this example, http://www.haskell.org/haskellwiki/GHC/As_a_library, i
can load a module and examine its symbols:
[...]
given Test.hs:
module Test where
hello = hello
Hi, Simon
Thanks a lot for your mail. It turns out I could have resolved this by
myself (with the help of this thread http://thread.gmane.org/gmane.comp.lang.haskell.glasgow.user/15153
, to be honest). What I was missing was this key part:
bind :: forall a b t. W t a - (a - W t b) - W_ t b
Hi
After installing ghc 6.10-rc, I have a program that no longer
compiles. I get the dreaded GADT pattern match error, instead :)
Here is a boiled-down example:
{-# OPTIONS_GHC -XGADTs -XEmptyDataDecls #-}
module T where
data S
data M
data Wit t where
S :: Wit S
M :: Wit M
On Oct 14, 2008, at 7:48 PM, Don Stewart wrote:
dgorin:
I've tried adding some signatures (together with -
XScopedTypeVariables), but with no luck. Why is it that this no
longer
compiles? More importantly, how can I make it compile again? :)
If you work out how to make it compile, can
Hi
If you just want to compile from (Eclipse) edit buffers instead of
source files, I think you can do this with the ghc api. Look at the
Target type.
The following is pasted from main/HscTypes.lhs
-- | A compilation target.
--
-- A target may be supplied with the actual text of the
--
On Jul 29, 2008, at 2:43 PM, Johannes Waldmann wrote:
-BEGIN PGP SIGNED MESSAGE-
Hash: SHA1
data Target = Target TargetId (Maybe (StringBuffer,ClockTime))
looks great. How is this intended to be used,
i.e. what should happen if there is an edit/save event in the IDE?
Then the IDE
On Jun 17, 2008, at 11:08 PM, Don Stewart wrote:
Haskell's type system is based on System F, the polymorphic lambda
calculus. By the Curry-Howard isomorphism, this corresponds to
second-order logic.
just nitpicking a little this should read second-order
propositional logic, right?
(Since this can be of interest to those using the ghc-api I'm cc-ing
the ghc users' list.)
Hi, Evan
The odd behavior you spotted happens only with hint under ghc-6.8. It
turns out the problem was in the session initialization.
Since ghc-6.8 the newSession function no longer receives a
(Since this can be of interest to those using the ghc-api I'm cc-ing
the ghc users' list.)
Hi, Evan
The odd behavior you spotted happens only with hint under ghc-6.8. It
turns out the problem was in the session initialization.
Since ghc-6.8 the newSession function no longer receives a
Hi
Something like this would do?
if_ = Compound $ If [(IntLit 6, Suite [] [Break])] Nothing
while_ = Compound $ While (IntLit 6) (Suite [] [if_]) Nothing
f = Program [while_]
-- this one fails
-- f2 = Program [if_]
newtype Ident = Id String
data BinOp = Add
| Sub
data Exp =
Hi
I have some code that uses MPTC + FDs + flexible and undecidable
instances that was working fine until I did a trivial modification on
another part of the project. Now, GHC is complaining with a very
confusing (for me, at least) error message. I've been finally able to
reproduce the
Hi, Chris
Thanks for your answer. I guess that my intuitions of what functional
dependencies and context meant were not very accurate (see below)
class C m f n | m - n, f - n where
c :: m - f - Bool
The m-n functional dependency means that I tell you
C x _ z is an instance then you
Of Daniel
| Gorín
| Sent: 26 September 2007 17:34
| To: glasgow-haskell-users@haskell.org
| Subject: module containing GADTs no longer compiles in ghc 6.8.0
|
| Hi
|
| I just tried to compile a project of mine that builds fine using ghc
| 6.6.1 and got many errors like this:
|
| src/HyLo
Hi
I just tried to compile a project of mine that builds fine using ghc 6.6.1 and
got many errors like this:
src/HyLo/Formula/NNF.hs:247:48:
GADT pattern match in non-rigid context for `Opaque'
Tell GHC HQ if you'd like this to unify the context
In the pattern: Opaque f'
In
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