[GHC] #11016: PartialTypeSignatures trigger bogus "unbound implicit parameter" error

[GHC]

#11016: PartialTypeSignatures trigger bogus "unbound implicit parameter" error
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        Reporter:  gridaphobe        |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  7.10.2
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  GHC rejects       |  Unknown/Multiple
  valid program                      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #10846            |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by Simon Peyton Jones <simonpj@…>):

 In [changeset:"28035c0900f8d535e0b03d4c2aa0c79ba728436d/ghc"
 28035c09/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="28035c0900f8d535e0b03d4c2aa0c79ba728436d"
 Add derived constraints for wildcard signatures

 This fixes Trac #11016

 See Note [Add deriveds for signature contexts] in TcSimplify]
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11016#comment:2>
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