[GHC] #16265: API Annotations: parens anns discarded for `(*)` operator

[GHC]

#16265: API Annotations: parens anns discarded for `(*)` operator
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           Reporter:  alanz          |             Owner:  (none)
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:  8.8.1
          Component:  Compiler       |           Version:  8.6.3
  (Parser)                           |
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  Incorrect API
  Unknown/Multiple                   |  annotation
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 The patch from https://phabricator.haskell.org/D4865 introduces

 {{{#!hs
     go _ (HsParTy _ (dL->L l (HsStarTy _ isUni))) acc ann fix
       = do { warnStarBndr l
            ; let name = mkOccName tcClsName (if isUni then "★" else "*")
            ; return (cL l (Unqual name), acc, fix, ann) }
 }}}

 which discards the parens annotations belonging to the `HsParTy`.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/16265>
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