[GHC] #13258: GHC head 8.1.20170209 does not compile package 'mono-traversable'

[GHC]

#13258: GHC head 8.1.20170209 does not compile package 'mono-traversable'
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        Reporter:  clinton           |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.1
      Resolution:                    |             Keywords:
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 ezyang):

 Possibly related to #13249? The default signature check is new so it may
 very well be picking up a bug.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13258#comment:1>
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