| >>Here's one concern I have with the deprecation of
| >>-XOverlappingInstances: I don't like overlapping instances, I find
| >>them confusing and weird and prefer to use code that doesn't
| >>include them, because they violate my expectations about how type
| >>classes work. When there is a singl
If you can't change the definition you can use the syntax Björn Bringert
added back in 2006 or so for StandaloneDeriving.
Just turn on
{-# LANGUAGE StandaloneDeriving, DeriveDataTypeable #-}
and then you can use
deriving instance Typeable Foo
-Edward
On Tue, Aug 5, 2014 at 1:47 PM, Volker Wy
Am Dienstag, 5. August 2014, 13:59:26 schrieb Brandon Allbery:
> On Tue, Aug 5, 2014 at 1:47 PM, Volker Wysk
> > So you need to be able to change the definition of the data type, in order
> > to
> > add deriving (Typeable). It's not possible to add a Typeable instance
> > declaration later.
>
> A
thats what i meant. I meant you can't WRITE the body of a typeable in 7.8,
you can derive though
On Tue, Aug 5, 2014 at 1:59 PM, Brandon Allbery wrote:
> On Tue, Aug 5, 2014 at 1:47 PM, Volker Wysk
> wrote:
>
>> Am Dienstag, 5. August 2014, 12:46:23 schrieb Carter Schonwald:
>> > i assume 7.6
On Tue, Aug 5, 2014 at 1:47 PM, Volker Wysk
wrote:
> Am Dienstag, 5. August 2014, 12:46:23 schrieb Carter Schonwald:
> > i assume 7.6 and 7.8, if we're talking GHC rather than GCC :)
> >
> > in 7.8 you can't define userland typeable instances, you need only write
> > deriving (Typeable) and you'r
Am Dienstag, 5. August 2014, 12:46:23 schrieb Carter Schonwald:
> i assume 7.6 and 7.8, if we're talking GHC rather than GCC :)
>
> in 7.8 you can't define userland typeable instances, you need only write
> deriving (Typeable) and you're all set.
> add some CPP to select the instances suitable
So
Am Dienstag, 5. August 2014, 12:49:29 schrieb Carter Schonwald:
> more concretely
> #if defined(__GLASGOW_HASKELL__) && ( __GLASGOW_HASKELL__ >= 707)
> --- do the deriving version here
I can't do a deriving version, because ProcessStatus is part of the GHC
libraries (System.Posix.Process). Its d
Hi Volker,
You can use this extension:
http://www.haskell.org/ghc/docs/latest/html/users_guide/deriving.html#stand-alone-deriving
to write that orphan Typeable instance for most ghcs (probably 6.10 is
the earliest).
It might be worth pushing for a Typeable instance to be added to the
unix package
more concretely
#if defined(__GLASGOW_HASKELL__) && ( __GLASGOW_HASKELL__ >= 707)
--- do the deriving version here
#else
--- your current stuff
#endif
On Tue, Aug 5, 2014 at 12:46 PM, Carter Schonwald <
carter.schonw...@gmail.com> wrote:
> i assume 7.6 and 7.8, if we're talking GHC rather than
i assume 7.6 and 7.8, if we're talking GHC rather than GCC :)
in 7.8 you can't define userland typeable instances, you need only write
deriving (Typeable) and you're all set.
add some CPP to select the instances suitable
On Tue, Aug 5, 2014 at 12:41 PM, Volker Wysk
wrote:
> Hi!
>
> I've been
Hi!
I've been working with GHC-4.6.3, and updating to GHC-4.8.3 breaks my code,
because the Typeable class has been changed. The compiler produces this
message:
-
src/HsShellScript/ProcErr.chs:2294:4:
‘typeOf’ is not a (visible) method of class ‘Typeable’
-
I want to def
I ran the same program on my dev linux and compared it to see if there were
clues.
On my dev box (Ubuntu) here are some snippets of the log (working app)
new task (taskCount: 1)
cap 0: created thread 1
new bound thread (1)
cap 0: schedule()
cap 0: running thread 1 (ThreadRunGHC)
New weak pointe
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