[GHC] #10004: rec {} causes "head:empty list" exception

[GHC]

#10004: rec {} causes "head:empty list" exception
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        Reporter:  alanz             |                   Owner:
            Type:  bug               |                  Status:  new
        Priority:  normal            |               Milestone:
       Component:  Compiler          |                 Version:  7.11
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  None/Unknown      |  Unknown/Multiple
      Blocked By:                    |               Test Case:
 Related Tickets:                    |                Blocking:
                                     |  Differential Revisions:
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Comment (by Simon Peyton Jones <simonpj@…>):

 In [changeset:"43636e1b8cf4a6d4752a22b098a9edd0759a7600/ghc"]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="43636e1b8cf4a6d4752a22b098a9edd0759a7600"
 Fix Trac #10004: head [] exception when using recursive mdo
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10004#comment:1>
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