[GHC] #10357: ApiAnnotations : pquals production adds AnnVbar in the wrong place

[GHC]

#10357: ApiAnnotations : pquals production adds AnnVbar in the wrong place
-------------------------------------+-------------------------------------
              Reporter:  alanz       |             Owner:  alanz
                  Type:  bug         |            Status:  new
              Priority:  normal      |         Milestone:  7.10.2
             Component:  Compiler    |           Version:  7.10.1
  (Parser)                           |  Operating System:  Unknown/Multiple
              Keywords:              |   Type of failure:  None/Unknown
  ApiAnnotations                     |        Blocked By:
          Architecture:              |   Related Tickets:
  Unknown/Multiple                   |
             Test Case:              |
              Blocking:              |
Differential Revisions:              |
-------------------------------------+-------------------------------------
 The `Parser.y` production for `pquals` is

 {{{
 pquals :: { Located [[LStmt RdrName (LHsExpr RdrName)]] }
     : squals '|' pquals
                      {% addAnnotation (gl $ last $ unLoc $1) AnnVbar (gl
 $2) >>
                         return (sLL $1 $> (reverse (unLoc $1) : unLoc $3))
 }
     | squals         { L (getLoc $1) [reverse (unLoc $1)] }
 }}}

 The `squals` are returned in reverse order, so the `AnnVbar` should be
 attached to the `head` of the list, not the `last`.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10357>
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