Dear all,
The following code doesn't seem to work properly. Either the main entry
(m1/mp1) or it's sub menu entry (ms1/mps1) do not seem to propagate the
event when pressed. It is possible to make it working by uncomments the
lines where the menu commands are registered in the frame.
I have
John Meacham wrote:
the reason being that id translates internally to
id = /\a . \x::a . x
since you cannot pull out an appropriate type to pass to id without
evaluating the 'irrefutable' pattern, you end up with _|_ instead of 4.
basically, allowing irrefutable matching on
Hi all.
Does anyone know of a Haskell compiler that will run from a USB stick?
I think something like Hugs + minimal libraries + WinHugs should be
small enough to install onto the stick, but I haven't tested this.
That'd be the ideal scenario as I'm teaching Haskell (so won't need
complicated
Hi,
I think something like Hugs + minimal libraries + WinHugs should be
small enough to install onto the stick, but I haven't tested this.
See MinHugs, http://cvs.haskell.org/Hugs/pages/downloading.htm, it
should fit on a USB stick easily, just install it to the USB drive and
you should be
another beginners question about monads: given the type
| data (Ix x) = Permutation x = Permutation [x]
i wanted to define
| instance Monad Permutation where
| return xs = Permutation xs
but of course nothing about the monad class guarantees xs to be of
type list. the monad class seems
Hello David,
Tuesday, October 3, 2006, 2:17:33 PM, you wrote:
Does anyone know of a Haskell compiler that will run from a USB stick?
i'm ôäüùûå sure that both hugs and ghc will work. all that you need is
to use full pathname of executable in cmdline, it should find other
settings itself. or,
On Oct 3, 2006, at 03:49 , Ross Paterson wrote:
On Tue, Oct 03, 2006 at 10:44:49AM +1000, Thomas Conway wrote:
I've been [trying to] grapple with the various monads and
transformers, and it occurs to me that the standard instance for
Either as a monadic type is unnecessarily restrictive. Is
On Tue, Oct 03, 2006 at 07:52:54AM -0400, Lennart Augustsson wrote:
Yes, having fail in the Monad is a horrible wart.
And like some other warts in Haskell it was added to cure the symptom
rather than the disease. :(
Switching metaphors, what do you see as the disease in this case?
(As far as
Bulat Ziganshin [EMAIL PROTECTED] writes:
Hello David,
Tuesday, October 3, 2006, 2:17:33 PM, you wrote:
Does anyone know of a Haskell compiler that will run from a USB stick?
i'm ôäüùûå sure
Блым?
--
Jón Fairbairn [EMAIL PROTECTED]
Ross Paterson wrote:
On Tue, Oct 03, 2006 at 07:52:54AM -0400, Lennart Augustsson wrote:
Yes, having fail in the Monad is a horrible wart.
(As far as I know, it's there for the translation of pattern match
failure in do-expressions.)
I think it would be much less of a wart if the signature
Jón == Jón Fairbairn [EMAIL PROTECTED] writes:
Jón Bulat Ziganshin [EMAIL PROTECTED] writes:
Hello David,
Tuesday, October 3, 2006, 2:17:33 PM, you wrote:
Does anyone know of a Haskell compiler that will run from a USB
stick?
i'm ôäüùûå sure
Jón Блым?
almost %-) Bulat accidently
Hi,
I am new to Haskell and am learning Haskell on my own with The Haskell
School of Expression. Unfortunately there is no teacher that comes
along with the book. I am having a problem with loading an excerise.
I get this message from ghci on a :l Shapes.hs
Shapes.hs:40:40:
Couldn't match
On 10/3/06, Edward Ing [EMAIL PROTECTED] wrote:
The source is below. Side is types as Float. My assumption was that
Haskell would know how to convert the Int to a float and all would be
well. I am I mistaken somewhere? The problem is with the last line.
Yes - Haskell does not automatically
Hello Edward,
Tuesday, October 3, 2006, 9:44:27 PM, you wrote:
Couldn't match `Side' against `Int'
In the first argument of `sin', namely `angle'
The source is below. Side is types as Float. My assumption was that
Haskell would know how to convert the Int to a float and all would be
It all came about because pattern matching failure sometimes cause a
do expression to be in MonadZero rather than Monad with the old
translation.
This gave rise to confusing error messages, it was claimed. This was
the disease.
-- Lennart
On Oct 3, 2006, at 08:28 , Ross Paterson
On Tue, Oct 03, 2006 at 12:10:52PM +0200, [EMAIL PROTECTED] wrote:
So you mean that
id = /\a . \x :: a . x
is /strict/ in its first argument, i.e. in the /type/ a. So to speak,
type erasure is equivalent to strictness in all and every type argument.
For an irrefutable existential
Hi folks,
I tried to build edison-1.2.0.1-sources with the command 'make system'
but got:
*** Exception: Line 10: Unknown field 'hs-source-dirs'
I am using GHC 6.4.1. Any idea how to fix this?
Thanks,
Lyle
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Haskell-Cafe mailing list
Hi All,
Next monad query [*]
In the 1995 paper Composing Haggis, layout is done using a monad to
compose individual elements. To modernize the syntax consider (forgive
the operator, but it avoids parentheses):
infixl 1 |
f | x = f x
mylayout
= do
hbox | do
button ok
On Tuesday 03 October 2006 22:00, Lyle Kopnicky wrote:
Hi folks,
I tried to build edison-1.2.0.1-sources with the command 'make system'
but got:
*** Exception: Line 10: Unknown field 'hs-source-dirs'
I am using GHC 6.4.1. Any idea how to fix this?
You are probably using an older version
Robert Dockins wrote:
On Tuesday 03 October 2006 22:00, Lyle Kopnicky wrote:
Hi folks,
I tried to build edison-1.2.0.1-sources with the command 'make system'
but got:
*** Exception: Line 10: Unknown field 'hs-source-dirs'
I am using GHC 6.4.1. Any idea how to fix this?
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