"rules" did not exist on "master"

GHC panics, -XTypeInType, possibly "cobox" related

I get

GHCi, version 8.1.20160902: http://www.haskell.org/ghc/  :? for help
[1 of 1] Compiling Tree             ( src/Tree.hs, interpreted )
ghc: panic! (the 'impossible' happened)
  (GHC version 8.1.20160902 for x86_64-apple-darwin):
	tcTyVarDetails
  cobox_a15m :: (n_a159[ssk] :: Peano) ~# ('Z :: Peano)

on the attached file.

Trac metadata

Trac field	Value
Version	8.1
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
Test case
Differential revisions
BlockedBy
Related
Blocking
CC
Operating system
Architecture

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