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 <allber...@gmail.com> wrote: > On Tue, Aug 5, 2014 at 1:47 PM, Volker Wysk <vertei...@volker-wysk.de> > 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're all set. >> > add some CPP to select the instances suitable >> >> 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. >> > > Are you sure? There is a standalone deriving syntax. > > deriving instance Typeable ProcessStatus > > > http://www.haskell.org/ghc/docs/latest/html/users_guide/deriving.html#stand-alone-deriving > > -- > brandon s allbery kf8nh sine nomine > associates > allber...@gmail.com > ballb...@sinenomine.net > unix, openafs, kerberos, infrastructure, xmonad > http://sinenomine.net > > _______________________________________________ > Glasgow-haskell-users mailing list > Glasgow-haskell-users@haskell.org > http://www.haskell.org/mailman/listinfo/glasgow-haskell-users > >
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