[GHC] #13587: addTopDecls fails with typed Template Haskell

[GHC]

#13587: addTopDecls fails with typed Template Haskell
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        Reporter:  tmcdonell         |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Template Haskell  |              Version:  8.2.1-rc1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by bgamari):

 My suspicion is that this is a result of the rather hacky way that we do
 dependency analysis for typed splices (where we just add everything in
 scope to the free variable set of the splice; see `Note [Free variables of
 typed splices]` in `RnSplice`) coupled with the fact that we don't run
 typed splices until type-checking (see `rnSpliceExpr`). This means that
 the declaration generated by the splice isn't present in the free variable
 set associated with the splice, causing us to fail during typechecking.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13587#comment:5>
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