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  • Glasgow Haskell CompilerGlasgow Haskell Compiler
  • GHCGHC
  • Issues
  • #2435
Closed
Open
Issue created Jul 11, 2008 by rl@cse.unsw.edu.au@trac-rl

Qualified name required when defining type family instance in instance declaration

With these two modules, GHC gives the following error:

Bar.hs:3:30: Not in scope: type constructor or class `T'

I have to use Foo.T in the instance definition. This is inconsistent with method definitions which must use unqualified names.

module Foo where
class C a where type T a
module Bar where
import qualified Foo
instance Foo.C Int where type T Int = Int
Trac metadata
Trac field Value
Version 6.9
Type Bug
TypeOfFailure OtherFailure
Priority normal
Resolution Unresolved
Component Compiler
Test case
Differential revisions
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Blocking
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Operating system Unknown
Architecture Unknown
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