[GHC] #9922: Partial type signatures + extensions panic

[GHC]

#9922: Partial type signatures + extensions panic
-------------------------------------+-------------------------------------
        Reporter:  monoidal          |                   Owner:  thomasw
            Type:  bug               |                  Status:  patch
        Priority:  normal            |               Milestone:  7.10.1
       Component:  Compiler (Type    |                 Version:  7.9
  checker)                           |                Keywords:
      Resolution:                    |            Architecture:
Operating System:  Unknown/Multiple  |  Unknown/Multiple
 Type of failure:  Compile-time      |               Test Case:
  crash                              |                Blocking:
      Blocked By:                    |  Differential Revisions:  Phab:D595
 Related Tickets:                    |
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Comment (by Austin Seipp <austin@…>):

 In [changeset:"c9532f810a82c6395bc08fb77f2a895a50da86b5/ghc"]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="c9532f810a82c6395bc08fb77f2a895a50da86b5"
 Fix panics of PartialTypeSignatures combined with extensions

 Summary:
 Disallow wildcards in stand-alone deriving instances
 (StandaloneDeriving), default signatures (DefaultSignatures) and
 instances signatures (InstanceSigs).

 Test Plan: validate

 Reviewers: austin

 Reviewed By: austin

 Subscribers: carter, thomie, monoidal

 Differential Revision: https://phabricator.haskell.org/D595

 GHC Trac Issues: #9922
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9922#comment:7>
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