[GHC] #12593: ghci spins forever

[GHC]

#12593: ghci spins forever
-------------------------------------+-------------------------------------
           Reporter:  Iceland_jack   |             Owner:
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:
          Component:  Compiler       |           Version:  8.0.1
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 When run with

 {{{
 ghci -ignore-dot-ghci -XRankNTypes -XTypeInType -XGADTs -XConstraintKinds
 t5AE.hs
 }}}

 the compiler spins

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12593>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler