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  • Glasgow Haskell Compiler
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  • #7494

Closed
Open
Opened Dec 10, 2012 by topi@trac-topi

Allow compatible type synonyms to be the return type of a GADT data constructor.

Please consider adding support for something like:

{-# LANGUAGE GADTs #-}

data Steps s y where
  Yield :: y -> FK s y -> FK s y
  Done  :: Steps s y 

newtype M y s a = M { unM :: (a -> FK s y) -> FK s y }
type FK s y = s -> Steps s y
Trac metadata
Trac field Value
Version 7.4.1
Type FeatureRequest
TypeOfFailure OtherFailure
Priority normal
Resolution Unresolved
Component Compiler (Type checker)
Test case
Differential revisions
BlockedBy
Related
Blocking
CC
Operating system
Architecture
Assignee
Assign to
8.0.1
Milestone
8.0.1 (Past due)
Assign milestone
Time tracking
None
Due date
None
Reference: ghc/ghc#7494