[GHC] #9182: Empty case analysis for function clauses

[GHC]

#9182: Empty case analysis for function clauses
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        Reporter:  dfranke           |            Owner:
            Type:  feature request   |           Status:  new
        Priority:  low               |        Milestone:
       Component:  Compiler          |          Version:  7.8.2
      Resolution:                    |         Keywords:
Operating System:  Unknown/Multiple  |     Architecture:  Unknown/Multiple
 Type of failure:  None/Unknown      |       Difficulty:  Unknown
       Test Case:                    |       Blocked By:
        Blocking:                    |  Related Tickets:
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Comment (by Fuuzetsu):

 But empty does have one case, where `x = undefined`. You can't pattern
 match on it but it's there.

 I imagine that this is in attempt to simulate : ∀ α. ⊥ → α where we use
 the impossible pattern in empty but that's just not the case in Haskell
 and even in Agda &c the binding is necessary anyway.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9182#comment:2>
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