[GHC] #12844: No Skolem Info with PartialTypeSignatures

[GHC]

#12844: No Skolem Info with PartialTypeSignatures
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        Reporter:  crockeea          |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.0.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Compile-time      |  Unknown/Multiple
  crash or panic                     |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by Simon Peyton Jones <simonpj@…>):

 In [changeset:"1bfff60fc57cd564382b86bdfb1f2764ca15d44f/ghc"
 1bfff60f/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="1bfff60fc57cd564382b86bdfb1f2764ca15d44f"
 Fix inference of partial signatures

 When we had
   f :: ( _ ) => blah
 we were failing to call growThetaTyVars, as we do in the
 no-type-signature case, and that meant that we weren't generalising
 over the right type variables.  I'm quite surprised this didn't cause
 problems earlier.

 Anyway Trac #12844 showed it up and this patch fixes it
 }}}

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12844#comment:1>
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