Pattern synonyms defined through other pattern synonyms produce `impossible happened` in ghci/runhaskell

This module content (Bug.hs)

{-# language PatternSynonyms #-}

data A a = A a

pattern B a = A a
pattern C a = B a

causes ghci/runhaskell to fail:

> :l Bug
[1 of 1] Compiling Main             ( Bug.hs, interpreted )
ghc: panic! (the 'impossible' happened)
  (GHC version 8.0.1 for x86_64-unknown-linux):
	kindPrimRep.go rep_a1r0

Please report this as a GHC bug:  http://www.haskell.org/ghc/reportabug

When using ghc everything compiles and even works, so adding the code

main = do
  let C a = A 1
  print a

produced executable that prints "1".

Trac metadata

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