GHC diverges when proving nonequality of types

Conor posted an interesting suggestion for proving type non-equality here:

http://www.nabble.com/Re%3A-Is-it-possible-to-prove-type-\*non\*-equality-in-Haskell--p25153135.html

I implemented it on my Nat framework and got GHC to diverge:

C:\haskell>ghc -c Absurd.hs
stack overflow: use +RTS -K<size> to increase it

I've attempted to shrink the code as much as possible and still reproduce the error; attached is the result.

Trac metadata

Trac field	Value
Version	6.10.4
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
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