Type family not reducing over data family

Given this code,

type family TEq t s where
  TEq t t = 'True
  TEq t s = 'False
data family T a

I expected this GHCi interaction to reduce: :kind! TEq (T Int) (T Bool)

But it does not. It does reduce (to 'True) if you instead ask,

:kind! TEq (T Int) (T Int)

Tested on GHC 7.10.2

Trac metadata

Trac field	Value
Version	7.10.2
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler (Type checker)
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