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 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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