[GHC] #12490: With RebindableSyntax, ApplicativeDo should eliminate return/pure

[GHC]

#12490: With RebindableSyntax, ApplicativeDo should eliminate return/pure
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        Reporter:  AaronFriel        |                Owner:  simonmar
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.0.1
      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 proposed solution here would be to lookup the `Name` of `return` in the
 environment and compare against it in `isReturnApp`.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12490#comment:5>
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