[GHC] #13511: ApplicativeDo return case doesn't handle lets

[GHC]

#13511: ApplicativeDo return case doesn't handle lets
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        Reporter:  mnislaih          |                Owner:  (none)
            Type:  feature request   |               Status:  new
        Priority:  normal            |            Milestone:  8.4.1
       Component:  Compiler          |              Version:  8.0.2
      Resolution:                    |             Keywords:  ApplicativeDo
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 mnislaih):

 If we stick to the definition of ApplicativeDo in the users guide, and
 given that join is not needed here, I think it is fair to say that this is
 a bug:

 > The language option -XApplicativeDo enables an alternative translation
 for the do-notation, which uses the operators <$>, <*>, along with join as
 far as possible.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13511#comment:5>
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