[GHC] #9879: Panic with partial type signatures

[GHC]

#9879: Panic with partial type signatures
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              Reporter:  monoidal    |            Owner:  thomasw
                  Type:  bug         |           Status:  patch
              Priority:  high        |        Milestone:  7.10.1
             Component:  Compiler    |          Version:  7.9
  (Type checker)                     |         Keywords:
            Resolution:              |     Architecture:  Unknown/Multiple
      Operating System:              |       Difficulty:  Unknown
  Unknown/Multiple                   |       Blocked By:
       Type of failure:  GHCi crash  |  Related Tickets:
             Test Case:              |
              Blocking:              |
Differential Revisions:  Phab:D572   |
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Comment (by Austin Seipp <austin@…>):

 In [changeset:"6eb86a56135a9274d2c958a2ccf4df510c9dab86/ghc"]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="6eb86a56135a9274d2c958a2ccf4df510c9dab86"
 Fix panic on :kind _ in GHCi (Trac #9879)

 Summary:
 Running `:kind _` in GHCi produced a panic, fix it by extracting the
 wildcards. Now, `:kind _` produces `_ :: k0`. Unfortunately, a `0` is
 added after the kind is tidied and I haven't found a way to get rid of
 it...

 This does not fix the other panic involving TemplateHaskell mentioned
 in #9879.

 Test Plan: new test GHCiWildcardKind should pass

 Reviewers: austin, simonpj

 Reviewed By: austin

 Subscribers: simonpj, carter, thomie, monoidal

 Differential Revision: https://phabricator.haskell.org/D572

 GHC Trac Issues: #9879
 }}}

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9879#comment:5>
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