[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 simonmar):

 The `do` expression doesn't match the requirements as described in the
 docs, so I don't think it's a bug.  Perhaps we could expand the heuristics
 to handle this case, but then the docs would get more complicated, and
 where does it end?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13511#comment:7>
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