[GHC] #12024: GHC leaks GHC.Prim.~# into type

[GHC]

#12024: GHC leaks GHC.Prim.~# into type
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        Reporter:  Iceland_jack      |                Owner:
            Type:  feature request   |               Status:  patch
        Priority:  normal            |            Milestone:
       Component:  Compiler (Type    |              Version:  7.10.3
  checker)                           |             Keywords:
      Resolution:                    |  PatternSynonyms
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:  T12024
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by Ben Gamari <ben@…>):

 In [changeset:"926469fcd9ba25b1c8f4b8113d6b6683259b9d6d/ghc" 926469f/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="926469fcd9ba25b1c8f4b8113d6b6683259b9d6d"
 testsuite: Add test for #12024

 Test Plan: Validate

 Reviewers: austin

 Subscribers: thomie

 Differential Revision: https://phabricator.haskell.org/D2702

 GHC Trac Issues: #12024
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12024#comment:5>
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