Incorrectly suggests ‘TypeOperators’

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{-# Language RankNTypes, GADTs, MagicHash, PolyKinds, TypeInType, ConstraintKinds #-}

import Data.Kind
import GHC.Exts
import qualified Prelude

class Semi (a :: TYPE rep) where

data Free :: forall rep. (TYPE rep -> Constraint) -> TYPE rep -> Type where
  Free :: (forall q. ctx q => (p -> q) -> q) -> Free ctx p

gives an incorrect suggestion

GHCi, version 8.2.0.20170507: http://www.haskell.org/ghc/  :? for help
[1 of 1] Compiling Main             ( tXMX.hs, interpreted )
Ok, modules loaded: Main.
*Main> :kind Free Semi
Free Semi :: * -> *
*Main> :kind Free Semi Int#

<interactive>:1:1: error:
    Not in scope: type constructor or class ‘#’

<interactive>:1:1: error:
    Illegal operator ‘#’ in type ‘Free Semi Int #’
      Use TypeOperators to allow operators in types

<interactive>:1:1: error:
    Operator applied to too few arguments: Free Semi Int #
*Main> 

This should recommend enabling MagicHash instead.

Trac metadata

Trac field	Value
Version	8.0.1
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
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