[GHC] #12597: -Wmissing-signatures uses forall even when invalid in source

[GHC]

#12597: -Wmissing-signatures uses forall even when invalid in source
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        Reporter:  nomeata           |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.0.1
      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 Simon Peyton Jones <simonpj@…>):

 In [changeset:"796f0f2ad7eefd1c9af5a7ef9bf56848067e85b1/ghc" 796f0f2/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="796f0f2ad7eefd1c9af5a7ef9bf56848067e85b1"
 Print foralls in user format

 This fixes Trac #12597: in RnNames.warnMissingSignatures,
 use pprSigmaType not pprType
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12597#comment:2>
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