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  • Glasgow Haskell Compiler
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  • #15711
Closed
Open
Created Oct 05, 2018 by Richard Eisenberg@raeDeveloper

Kind inference of class variables does not examine associated types

If I say this

{-# LANGUAGE TypeFamilies, PolyKinds, DataKinds #-}

module Bug where

class C a where
  type F (x :: Maybe a)

then GHCi says this

*Bug> :k C
C :: k -> Constraint

That's silly. C should have kind Type -> Constraint, because the usage of a in the kind of the associated type constraints a's kind.

Will fix.

Trac metadata
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Version 8.6.1
Type Bug
TypeOfFailure OtherFailure
Priority normal
Resolution Unresolved
Component Compiler
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