[GHC] #14726: Add AnnTypeAt to distinguish between '@' for type application

[GHC]

#14726: Add AnnTypeAt to distinguish between '@' for type application
-------------------------------------+-------------------------------------
           Reporter:  alanz          |             Owner:  (none)
               Type:  task           |            Status:  new
           Priority:  normal         |         Milestone:
          Component:  Compiler       |           Version:  8.2.2
  (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:
-------------------------------------+-------------------------------------
 At the moment all uses of '@' have the same annotation.

 It simplifies tools to provide a different one for the `@` in visible type
 application.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14726>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler