[GHC] #12509: ghci -XSafe fails in an inscrutable way

[GHC]

#12509: ghci -XSafe  fails in an inscrutable way
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        Reporter:  int-e             |                Owner:  dterei
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.0.1
      Resolution:                    |             Keywords:  SafeHaskell
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by monoidal):

 Since the ticket had no activity for over 2 years, I think you can go
 ahead. I suspect that that this can be done using code similar to
 https://phabricator.haskell.org/D5452.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12509#comment:5>
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