On 01/13/2011 12:49 AM, Simon Marlow wrote:
I spent quite some time yesterday playing with submodules to see if they
would work for GHC. I'm fairly sure there are no fundamental reasons that
we couldn't use them, but there are enough gotchas to put me off. I wrote
down what I discovered here:
Hi Simon,
On 12/08/2010 12:45 AM, Simon Peyton-Jones wrote:
I have personal experience of git, because I co-author papers with git
users. I am not very technologically savvy, but my failure rate with git
is close to 100%. Ie I can do the equivalent of 'pull' or 'push' but I
fail at
On 11/13/2010 08:55 AM, Petr Prokhorenkov wrote:
import Data.List
wtf d = head . dropWhile ( 10^100) . map (*d) $ enumFrom 2
main = do
print $ wtf 1
print $ wtf 2 -- Everything is ok without this line
Is there any way to overcome this?
I think this phenomenon is called the full
On 11/09/2010 02:36 AM, John Lato wrote:
I was wondering if there is a status report anywhere of progress towards
making ghc compile 64-bit on Snow Leopard. There are a few trac tickets
that seem related:
I think http://hackage.haskell.org/trac/ghc/ticket/3472
is related if you haven't seen
On 08/23/2010 07:15 AM, Ian Lynagh wrote:
Could someone summarise this thread in a ticket in the GHC trac?
http://hackage.haskell.org/trac/ghc/ticket/4274
HTH, Brian
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On 08/23/2010 07:15 AM, Ian Lynagh wrote:
Could someone summarise this thread in a ticket in the GHC trac?
http://hackage.haskell.org/trac/ghc/
I'd be happy to, I'll follow up as soon as I can find time.
Thanks,
-Brian
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On 08/18/2010 04:55 PM, Donn Cave wrote:
Quoth Brian Bloniarz brian.bloni...@gmail.com,
IMHO the simplest fix is the patch below: simply
avoid SIG_IGN, instead install a handler which does nothing.
This way, an exec() restores the handler to SIG_DFL. I've
included a testcase too.
I don't
On 08/18/2010 07:06 PM, Donn Cave wrote:
Quoth Brian Bloniarz brian.bloni...@gmail.com,
...
I just tested linux in this scenario, it gives EPIPE as I'd expect.
Linux's SA_RESTART has been reliable in my limited experience. Do
you have an OpenSolaris install to test by any chance? The code
The GHC runtime ignores SIGPIPE by setting the signal
to SIG_IGN. This means that any subprocesses (created via
System.Process or otherwise) will also have their
SIGPIPE handler set to SIG_IGN; I think this might be
a bug. The Python runtime does the same thing,
there's a good explanation of the
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On Thu=2C 2009-10-01 at 03:29 +=2C Brian Bloniarz wrote:
I.e. why does an exception raised during exception handling get
propagated past
Sorry for the garbled post, this should hopefully be plain text:
On Thu, 2009-10-01 at 03:29 +, Brian Bloniarz wrote:
I.e. why does an exception raised during exception handling get
propagated past the exception that triggered the handler?
Because it's the obvious and sensible thing
I had a question about onException friends: what's the rationale
for having:
(error foo) `onException` (error bar)
give bar and not foo? I.e. why does an exception raised during
exception handling get propagated past the exception that triggered
the handler?
Most examples I can think for
Hi all,
Malcom Wallace wrote:
Martijn van Steenbergen mart...@van.steenbergen.nl wrote:
But this uses length and init and last all of which are recursive
functions. I consider that cheating: only foldr may do the recursion.
I think the key is to pick your intermediate data-structure
How about the following, using difference lists?
import Control.Arrow
import qualified Data.DList as D
start = (Nothing, (D.empty, D.empty))
iter (Nothing, (r1, r2)) x = (Just x, (r1, r2))
iter (Just y, (r1, m)) x =
D.list (Nothing, (D.singleton y, D.singleton x))
(\r r2
sweet.
On Sat, May 16, 2009 at 3:08 PM, Brian Bloniarz phun...@hotmail.com wrote:
Hi,
It's come time to share something that I've been playing around with
recently:
a branch of HaskellDB which replaces the home-grown Record code with HList
records. It's definitely not ready
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/hlist-20090516.tar.gz
I'll talk to the HList people about getting those merged.
Thanks!
Brian Bloniarz
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Hi George,
Since none of the type metaprogramming specialists have answered you on-list,
I took a crack at this -- I think you can work around the issue by avoiding
overlapping instances entirely. I learned about this technique from the HList
paper this message:
Actually, it's not necessary to remove the overlap, it's enough to
add the ImplementsPrev constraint:
instance (Pred x x', Nthable b x' r, ImplementsPrev (Tuple n a b) x) ⇒
Nthable (Tuple n a b) x r where
nth _ (Tuple _ b) = nth (undefined ∷ x') b
It looks like this typechecks too --
I got confused by the GHC documentation recently, I was wondering how
it could be improved. From:
http://www.haskell.org/ghc/docs/latest/html/users_guide/bang-patterns.html
A bang only really has an effect if it precedes a variable or wild-card
pattern:
f3 !(x,y) = [x,y]
f4 (x,y) = [x,y]
Wolfgang Jeltsch wrote:
Make , an infix operator. Then even the syntax (,) works without further ado.
Make , right-associative, for example. Then you can write (a1,...,an) which
means (a1,(a2,(...,an))). You just need one data declaration:
data (a,b) = (a,b)
However, this has
Hi John,
In the class I wrote, c has kind * (e.g. [a]), but then I don't see
how to write a suitable map function. For that, I would want c to
have kind * - *. Unfortunately then I don't know to write the
others.
Would I have to do something with c having kind (* - *) ?
class
a feature request and add
yourself on the CC: list (to vote for this feature).
http://hackage.haskell.org/trac/ghc/wiki/ReportABug
Thanks,
Brian Bloniarz
I have a question about the display of names for associated types in GHCi.
I have a module with a matrix type constructor:
data (Natural r
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