[GHC] #9699: TH function to list names in scope

[GHC]

#9699: TH function to list names in scope
-------------------------------------+-------------------------------------
       Reporter:  MikeIzbicki        |                   Owner:
           Type:  feature request    |                  Status:  new
       Priority:  normal             |               Milestone:
      Component:  Template Haskell   |                 Version:  7.8.3
       Keywords:                     |        Operating System:
   Architecture:  Unknown/Multiple   |  Unknown/Multiple
     Difficulty:  Unknown            |         Type of failure:
     Blocked By:                     |  None/Unknown
Related Tickets:                     |               Test Case:
                                     |                Blocking:
                                     |  Differential Revisions:
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 I [asked about this on
 stackoverflow](http://stackoverflow.com/questions/26394199/using-
 templatehaskell-to-list-all-names-in-a-namespace), and apparently it
 doesn't exist yet.

 I want a TemplateHaskell function `variablesInScope :: Q [Name]` that
 returns a list of the `Name`'s of all the variables in scope.
 TemplateHaskell obviously has this information available in order to
 implement functions like `reify :: Name -> Q Info` and `lookupValueName ::
 String -> Q (Maybe Name)`.  So it seems like this might be a pretty simple
 function to add.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9699>
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