[GHC] #13648: ApplicativeDo selects "GHC.Base.Monad.return" when actions are used without patterns.

[GHC]

#13648: ApplicativeDo selects "GHC.Base.Monad.return" when actions are used without
patterns.
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        Reporter:  AaronFriel        |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.2.1-rc1
      Resolution:                    |             Keywords:  ApplicativeDo
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  GHC rejects       |  Unknown/Multiple
  valid program                      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by bgamari):

 As you point out, the relevant bit of code is in `RnExpr`. In particular,
 I believe that `stmtTreeToStmts` is relevant.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13648#comment:3>
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