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  • Glasgow Haskell CompilerGlasgow Haskell Compiler
  • GHCGHC
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  • #2914
Closed
Open
Issue created Jan 06, 2009 by ganesh@trac-ganesh

RecordWildCards doesn't work with associated datatypes inside class instances

It seems like record wildcards (the ".." notation) don't work in the following scenario.

I tried with a standalone associated datatype and it works fine.

Tested with 6.10.1 and 6.11.20090103.

{-# LANGUAGE TypeFamilies, RecordWildCards #-}
module AssocWildCards where

class FooClass a where
   data FooType a

instance FooClass Int where
   data FooType Int = FooInt { fooIntVal :: Int }

fooInt :: Int -> FooType Int
fooInt fooIntVal = FooInt{..}

fromFooInt :: FooType Int -> Int
fromFooInt FooInt{..} = fooIntVal
Trac metadata
Trac field Value
Version 6.11
Type Bug
TypeOfFailure OtherFailure
Priority normal
Resolution Unresolved
Component Compiler
Test case
Differential revisions
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CC ganesh.sittampalam@credit-suisse.com
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