[Typeable2] Re: ANNOUNCE: GHC 7.8.1 Release Candidate 1

[Christian Maeder]

With "TypeableN " I mean, Typeable1, Typeable2, etc.
Typeable2 was not supported (below) by ghc-7.8-rc1.

Where is the "backward compat"?

In fact, Typeable and Typeable2 mean the same thing for ghc-7.8-rc1 and 
ghc-7.6 resp.!

C.

Am 20.02.2014 17:00, schrieb Simon Peyton Jones:
> | Can you not simply let ghc-7.8 interpret TypeableN as Typeable?
>
> Not really: ghc-7.8 does still support TypeableN I think (for backward compat reasons).  So it can't take it to mean two different things.
>
> | -----Original Message-----
> | From: Glasgow-haskell-users [mailto:glasgow-haskell-users-
> | bounces at haskell.org] On Behalf Of Christian Maeder
> | Sent: 20 February 2014 15:51
> | To: Daniil Frumin
> | Cc: glasgow-haskell-users at haskell.org
> | Subject: Re: [Typeable2] Re: ANNOUNCE: GHC 7.8.1 Release Candidate 1
> |
> | Yes, changing Typeable2 to Typeable in:
> |
> | {-# LANGUAGE StandaloneDeriving, DeriveDataTypeable #-} ...
> | deriving instance Typeable Gr
> |
> | goes through with ghc-7.8-rc1.
> |
> | However, this change refuses to compile with ghc-7.6.3:
> |
> |      Expecting two more arguments to `Gr'
> |      In the stand-alone deriving instance for `Typeable Gr'
> |
> | This is unfortunate, because I need to add conditional compilation to
> | make my code compilable for the two most recent major versions of GHC.
> |
> | Can you not simply let ghc-7.8 interpret TypeableN as Typeable?
> |
> | Cheers Christian
> |
> | Am 13.02.2014 15:36, schrieb Daniil Frumin:
> | > I think that the preferred solution is to get rid of the custom
> | > Typeable(2) instances and just derive Typeable
> | >
> | > On Thu, Feb 13, 2014 at 5:22 PM, Christian Maeder
> | > <Christian.Maeder at dfki.de> wrote:
> | >> Hi,
> | >>
> | >> with ghc-7.8.20140130 I get the compilation error:
> | >>
> | >>      Not in scope: type constructor or class 'Typeable2'
> | >>      Perhaps you meant 'Typeable' (imported from Data.Typeable)
> | >>
> | >> What is the recommend way to adjust my code or my dependencies?
> | >>
> | >> Cheers Christian
> | >>
> | >> Am 03.02.2014 23:35, schrieb Austin Seipp:
> | >>>
> | >>> We are pleased to announce the first release candidate for GHC
> | 7.8.1:
> | >>>
> | >>>       http://www.haskell.org/ghc/dist/7.8.1-rc1/
> | >>>       http://www.haskell.org/ghc/docs/7.8.1-rc1/html/
> | >>>
> | >>> This includes the source tarball and bindists for Windows, Linux, OS
> | >>> X, FreeBSD, and Solaris, on x86 and x86_64. There is a signed copy
> | >>> of the SHA256 hashes available (attached) using my GPG key (keyid
> | >>> 0x3B58D86F).
> | >>>
> | >>> We plan to make the 7.8.1 RC2 release quite soon, as we're aware of
> | >>> some existing issues.
> | >>>
> | >>> Please test as much as possible; bugs are much cheaper if we find
> | >>> them before the release!
> | >>>
> | >>>
> | >>>
> | >>>
> | >>> _______________________________________________
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> | >>> Glasgow-haskell-users at haskell.org
> | >>> http://www.haskell.org/mailman/listinfo/glasgow-haskell-users
> | >>>
> | >>
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> | >
> | >
> | >
> |
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