The standalone deriving decl you need is the one for (Data (a :+: b)), not for Expr
Simon | -----Original Message----- | From: [email protected] [mailto:glasgow-haskell- | [email protected]] On Behalf Of Ron Alford | Sent: 12 April 2010 11:09 | To: Simon Peyton-Jones | Cc: glasgow-haskell-users | Subject: Re: Deriving regression or bad code? | | I was getting a similar error with standalone deriving (already | attached to that bug), but I didn't try it through-out. I'll let you | know how it goes. | | -Ron | | | On Mon, Apr 12, 2010 at 6:01 AM, Simon Peyton-Jones | <[email protected]> wrote: | > It's really a bug. I've fixed it in my tree, but I'm at 2.8 and don't have | time to validate etc. So I'm doubtful that I'll be in time to get a fix into | 6.12.1, alas. | > | > Well, maybe I can build a patch and send it to Simon/Ian for testing. I'll | try to do that if it's important to you. | > | > it's bit of an exotic case because of the higher-kindedness so I don't | think it'll bite too man people | > | > There's a good workaround: use "standalone deriving". | > | > You | > | > | -----Original Message----- | > | From: [email protected] [mailto:glasgow-haskell- | > | [email protected]] On Behalf Of Ron Alford | > | Sent: 10 April 2010 22:33 | > | To: glasgow-haskell-users | > | Subject: Re: Deriving regression or bad code? | > | | > | Just for fun, I tried it on 6.12.1.20100330 with the same result. | > | Does anyone have a workaround? Otherwise I need to revert to 6.10. | > | | > | -Ron | > | | > | On Thu, Apr 8, 2010 at 10:35 AM, Ron Alford <[email protected]> wrote: | > | > At Igloo's suggestion, it's now a ticket: | > | > http://hackage.haskell.org/trac/ghc/ticket/3965 | > | > | > | > -Ron | > | > | > | > On Thu, Apr 8, 2010 at 1:39 AM, Ron Alford <[email protected]> wrote: | > | >> I've attached the simplest example of my code that used to compile in | > | >> GHC 6.10 now gives the error in GHC 6.12.1: | > | > ... | > | > | > | _______________________________________________ | > | Glasgow-haskell-users mailing list | > | [email protected] | > | http://www.haskell.org/mailman/listinfo/glasgow-haskell-users | > | > | _______________________________________________ | Glasgow-haskell-users mailing list | [email protected] | http://www.haskell.org/mailman/listinfo/glasgow-haskell-users _______________________________________________ Glasgow-haskell-users mailing list [email protected] http://www.haskell.org/mailman/listinfo/glasgow-haskell-users
