Deriving regression or bad code?
simonpj at microsoft.com
Mon Apr 12 06:01:17 EDT 2010
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".
| -----Original Message-----
| From: glasgow-haskell-users-bounces at haskell.org [mailto:glasgow-haskell-
| users-bounces at haskell.org] 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 18.104.22.16800330 with the same result.
| Does anyone have a workaround? Otherwise I need to revert to 6.10.
| On Thu, Apr 8, 2010 at 10:35 AM, Ron Alford <ronwalf at volus.net> 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 <ronwalf at volus.net> 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:
| > ...
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