[GHC] #11321: API Annotations: AnnTilde missing

[GHC]

#11321: API Annotations: AnnTilde missing
-------------------------------------+-------------------------------------
           Reporter:  alanz          |             Owner:  alanz
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:  8.0.1
          Component:  Compiler       |           Version:  7.10.3
           Keywords:                 |  Operating System:  Unknown/Multiple
  ApiAnnotations                     |
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
-------------------------------------+-------------------------------------
 In T10689a.hs, the fragment

 {{{#!hs
 data instance Sing (z :: [a])
   = z ~ '[] =>
     SNil
   | forall (m :: a)
            (n :: [a]). z ~ (:) m n =>
     SCons (Sing m) (Sing n)
 }}}

 ends up with the `AnnTilde` annotations for the two tildes not attached to
 the final AST.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11321>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler