[GHC] #10501: Exception in :cmd command can terminate GHCi

[GHC]

#10501: Exception in :cmd command can terminate GHCi
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              Reporter:  watashi  |             Owner:  watashi
                  Type:  bug      |            Status:  new
              Priority:  normal   |         Milestone:  7.12.1
             Component:  GHCi     |           Version:  7.10.1
              Keywords:           |  Operating System:  Linux
          Architecture:  x86      |   Type of failure:  GHCi crash
             Test Case:           |        Blocked By:
              Blocking:           |   Related Tickets:
Differential Revisions:           |
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 {{{
 watashi % ghci -ignore-dot-ghci
 GHCi, version 7.10.1: http://www.haskell.org/ghc/  :? for help
 Prelude> :cmd return $ head []
 ghc: panic! (the 'impossible' happened)
   (GHC version 7.10.1 for i386-unknown-linux):
         Prelude.head: empty list

 Please report this as a GHC bug:  http://www.haskell.org/ghc/reportabug
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10501>
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