Type family injectivity annotations ignored in hs-boot files

Here's the test case:

-- A.hs-boot
{-# LANGUAGE TypeFamilies #-}

module A where

type family Id x = r | r -> x where ..

-- needed to avoid illegal self-import
module B where

import {-# SOURCE #-} A

{-# LANGUAGE TypeFamilies #-}

module A where

import B

type family Id x = r | r -> x where
  Id a = a

I get

A.hs-boot:6:1: error:
    Type constructor ‘Id’ has conflicting definitions in the module
    and its hs-boot file
    Main module: type family Id x = r :: * | r -> x where
                     Id a = a
    Boot file:   type family Id x :: *

Even when declaring an abstract closed type family, it should still be able to be injective.

Trac metadata

Trac field	Value
Version	7.11
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler (Type checker)
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