[GHC] #11814: Insufficient in-scope-sets

[GHC]

#11814: Insufficient in-scope-sets
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           Reporter:  goldfire       |             Owner:
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:
          Component:  Compiler       |           Version:  8.1
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 I found two spots where we were making insufficient `InScopeSet`s (while
 updating `singletons` for 8.0), in `mkCastTy` and `mkWWargs`.

 I don't have a reduced test case for either; if you really want one, just
 try compiling `singletons` once it's updated.

 Fix en route.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11814>
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