Skip to content

Internal error with kind annotation on associated type family

The following module:

{-# LANGUAGE PolyKinds              #-}
{-# LANGUAGE TypeFamilies           #-}

module Bug where

class C (a :: k) where
  type F (a :: k)

Makes GHC raise an internal error:

    GHC internal error: `k' is not in scope during type checking, but it passed the renamer
    tcl_env of environment: [(reB,
                              AThing forall (k :: BOX). k -> Constraint),
                             (reC, AThing forall (k :: BOX) (k :: BOX). k -> k)]
    In the kind `k'
    In the class declaration for `C'
Trac metadata
Trac field Value
Version 7.7
Type Bug
TypeOfFailure OtherFailure
Priority normal
Resolution Unresolved
Component Compiler
Test case
Differential revisions
BlockedBy
Related
Blocking
CC
Operating system
Architecture
To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information