[GHC] #10256: parser: API Annotations : guardquals1 does not annotate commas properly

[GHC]

#10256: parser: API Annotations : guardquals1 does not annotate commas properly
-------------------------------------+-------------------------------------
        Reporter:  alanz             |                   Owner:  alanz
            Type:  bug               |                  Status:  patch
        Priority:  normal            |               Milestone:  7.10.2
       Component:  Compiler          |                 Version:  7.10.1
  (Parser)                           |                Keywords:
      Resolution:                    |  ApiAnnotations
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  None/Unknown      |  Unknown/Multiple
      Blocked By:                    |               Test Case:
 Related Tickets:                    |                Blocking:
                                     |  Differential Revisions:  Phab:D818
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Comment (by Austin Seipp <austin@…>):

 In [changeset:"9eab6feed44ad8beb6703d2e27ce47a8f79d0f49/ghc"]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="9eab6feed44ad8beb6703d2e27ce47a8f79d0f49"
 parser: API Annotations : guardquals1 does not annotate commas properly

 The `guardquals1` production includes

    : guardquals1 ',' qual  {% addAnnotation (gl $ last $ unLoc $1)
 AnnComma
                                              (gl $2) >>
                                return (sLL $1 $> ($3 : unLoc $1)) }

 The AnnComma should be attached to `(gl $ head $ unLoc $1)`, rather than
 `last`.

 Reviewed By: austin

 Differential Revision: https://phabricator.haskell.org/D818

 GHC Trac Issues: #10256
 }}}

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10256#comment:4>
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