| The head has -dsuppress-coercions which omits coercion terms when pretty
| printing Core. It would be easy to backport that to 6.12.
The HEAD also has a coercion optimiser that dramatically shrinks some large
coercion terms.
| I might revert both mwc-random and statistics back to using plain
On 13/07/2010 05:49, Evan Laforge wrote:
On Mon, Jul 12, 2010 at 6:54 PM, John Meachamj...@repetae.net wrote:
Hi, is a StablePtr what you are after?
Indeed, it looks like StablePtr will get me what I want. It's a
little less convenient than FunPtr because I'm already doing some
finalization
It compiles to
lift f d = f (d `cast` blah)
which seems fine to me. Are you unhappy with that?
Simon
From: glasgow-haskell-users-boun...@haskell.org
[mailto:glasgow-haskell-users-boun...@haskell.org] On Behalf Of Louis Wasserman
Sent: 09 July 2010 03:30
To: glasgow-haskell-users@haskell.org
Mmmm, let's give a slightly different example:
foo :: Foo - Int
foo (Foo a) = a + 1
bar :: Int - Int
bar = foo . Foo
and I'd expect bar to be replaced with (foo `cast` (Int - Int)) and
inlined, eliminating an allocation. In general, we'd get the equivalent of
the no-allocation versions of
Or a different way:
I want -fdo-lambda-eta-expansion (which, if I understand correctly, actually
triggers eta *reduction*) to eliminate argument casts, as well.
My motivation: I'm working on a generalized trie library, and due to
http://hackage.haskell.org/trac/ghc/ticket/4185, I can't use
Hi Evan, Ed,
On Jul 12, 2010, at 22:53, Edward Z. Yang wrote:
Excerpts from Evan Laforge's message of Mon Jul 12 16:43:45 -0400
2010:
Yeah, that's definitely the safest and simplest. But the copying
defeats the purpose of passing a pointer in the first place, which
was
to not have to
Excerpts from Axel Simon's message of Tue Jul 13 16:03:01 -0400 2010:
If your C code has a way to properly unref a pointer then you could
wrap your ForeignPtr in a StablePtr and pass that to C land. Once C
has freed the StablePtr the ForeignPtr can become dead when Haskell
has dropped
On Jul 13, 2010, at 22:17, Edward Z. Yang wrote:
Excerpts from Axel Simon's message of Tue Jul 13 16:03:01 -0400 2010:
If your C code has a way to properly unref a pointer then you could
wrap your ForeignPtr in a StablePtr and pass that to C land. Once C
has freed the StablePtr the ForeignPtr
Excerpts from Axel Simon's message of Tue Jul 13 16:28:29 -0400 2010:
Well, if the C code hangs on to the StablePtr that wraps the
ForeignPtr, its finalizer won't be run. But can run again once the
StablePtr is freed. So you can take out the Ptr in the ForeignPtr and
use it in C land as
Hi,
I have encountered a bug in GHC type checker. I have stripped down my code to
small manageable example that illustrates the bug:
{-# LANGUAGE GADTs #-}
{-# OPTIONS -Wall #-}
module StrangeGADT where
data Q a where
ToQ :: (QA a) = a - Q a
Sum :: (QA a, Num a) = Q [a] - Q a
class QA a
On Wednesday 14 July 2010 00:11:00, George Giorgidze wrote:
Hi,
I have encountered a bug in GHC type checker. I have stripped down my
code to small manageable example that illustrates the bug:
{-# LANGUAGE GADTs #-}
{-# OPTIONS -Wall #-}
module StrangeGADT where
data Q a where
ToQ ::
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