[GHC] #10668: Missing brackets in import hint with TypeOperators

[GHC]

#10668: Missing brackets in import hint with TypeOperators
-------------------------------------+-------------------------------------
        Reporter:  bjmprice          |                   Owner:  thomasw
            Type:  bug               |                  Status:  new
        Priority:  normal            |               Milestone:
       Component:  Compiler          |                 Version:  7.10.1
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  Incorrect         |  Unknown/Multiple
  warning at compile-time            |               Test Case:
      Blocked By:                    |                Blocking:
 Related Tickets:                    |  Differential Revisions:  Phab:D1093
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Comment (by Ben Gamari <ben@…>):

 In [changeset:"b5c94262fa79f735334165c53667f113e07df5e1/ghc"
 b5c94262/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="b5c94262fa79f735334165c53667f113e07df5e1"
 Parenthesise TypeOperator in import hints

 When a constructor was mistakenly imported directly instead of as a
 constructor of a data type, a hint will be shown on how to correctly
 import
 it. Just like the constructor, the data type should be surrounded in
 parentheses if it is an operator (TypeOperator in this case).

 Instead of:

     error:
         In module ‘Data.Type.Equality’:
           ‘Refl’ is a data constructor of ‘:~:’
         To import it use
           ‘import’ Data.Type.Equality( :~:( Refl ) )
         or
           ‘import’ Data.Type.Equality( :~:(..) )

 Print:

     error:
         In module ‘Data.Type.Equality’:
           ‘Refl’ is a data constructor of ‘(:~:)’
         To import it use
           ‘import’ Data.Type.Equality( (:~:)( Refl ) )
         or
           ‘import’ Data.Type.Equality( (:~:)(..) )

 Test Plan: pass new test

 Reviewers: austin, bgamari, simonpj

 Reviewed By: simonpj

 Subscribers: simonpj, thomie

 Differential Revision: https://phabricator.haskell.org/D1093

 GHC Trac Issues: #10668
 }}}

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10668#comment:4>
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