Expected kind ‘k0’, but has kind ‘(forall k. k, forall k. k)’

The following code works in GHC 7.10:

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

type family Default :: k
type instance Default = '(Default, Default)

But fails in HEAD with:

Expected kind ‘k0’, but ‘'(Default, Default)’ has kind ‘(forall k. k, forall k. k)’

Trac metadata

Trac field	Value
Version	7.11
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler (Type checker)
Test case
Differential revisions
BlockedBy
Related
Blocking
CC
Operating system
Architecture

mentioned in issue #11206 (closed)

changed weight to 5

added Tbug Trac import typechecker labels

assigned to @rae

I have a fix for this locally. I'm commoning up a bunch of fixes and will validate/push all at once.

mentioned in commit 5e4e9e00

closed

Trac metadata

Trac field	Value
Resolution	Unresolved → ResolvedFixed
Test case	- → polykinds/T11255

changed milestone to %8.0.1

added Pnormal label