RE: GHC 7.0.1 rc1: Could not deduce (Typeable a) from the context (Typeable a, …)
simonpj at microsoft.com
Thu Sep 30 13:32:15 EDT 2010
Thank you! I can reproduce it. It is a truly egregious error. It will be fixed.
| -----Original Message-----
| From: glasgow-haskell-users-bounces at haskell.org [mailto:glasgow-haskell-users-
| bounces at haskell.org] On Behalf Of Malte Sommerkorn
| Sent: 30 September 2010 15:55
| To: Simon Peyton-Jones
| Cc: glasgow-haskell-users at haskell.org
| Subject: Re: GHC 7.0.1 rc1: Could not deduce (Typeable a) from the context (Typeable
| a, …)
| Simon Peyton-Jones wrote:
| > Oh dear, that really is quite a strange error message. Something is
| > definitely wrong. Can you please make a ticket for it, and include
| > instructions on how to reproduce it?
| Done: http://hackage.haskell.org/trac/ghc/ticket/4355
| > I gather that it depends on other packages that themselves needed changes,
| > so reproduction might not be entirely easy?
| I've attached a module to the bug report that triggers the problem and only
| depends on base and mtl, so that should be fairly easy to reproduce.
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