Deriving regression or bad code?

Simon Peyton-Jones 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". 

You 

| -----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 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 <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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