[GHC] #4089: Empty Show instance + phantom type + GHCi = out of memory

[GHC]

#4089: Empty Show instance + phantom type + GHCi = out of memory
-----------------------+----------------------------------------------------
    Reporter:  japple  |       Owner:            
        Type:  bug     |      Status:  new       
    Priority:  normal  |   Component:  GHCi      
     Version:  6.12.2  |    Keywords:            
          Os:  Linux   |    Testcase:            
Architecture:  x86     |     Failure:  GHCi crash
-----------------------+----------------------------------------------------
 {{{
 module ShowMemory where

 data M a = M

 instance Show a => Show (M a)
 }}}

 Load in GHCi, type "M" and then enter at the prompt.

 It kills all my memory. I have no .ghci

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4089>
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