module containing GADTs no longer compiles in ghc 6.8.0
dgorin at dc.uba.ar
Wed Sep 26 12:33:52 EDT 2007
I just tried to compile a project of mine that builds fine using ghc 6.6.1 and
got many errors like this:
GADT pattern match in non-rigid context for `Opaque'
Tell GHC HQ if you'd like this to unify the context
In the pattern: Opaque f'
In the expression: \ (Opaque f') -> Opaque (Box r f')
In the definition of `box':
box = \ (Opaque f') -> Opaque (Box r f')
I don't know what a "non-rigid context" is, nor if "I like this to unify the
context" or not, but I would certainly be happy if I could get this module to
compile again! :)
For the record, I was using ghc-220.127.116.1170917. Please let me know if you need
PS: On a side note, I found this error message to be kind of funny. It seems
to indicate no real error but some sort of error-message-driven poll!
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