[GHC] #10381: Type-checking failure with RankNTypes and RebindableSyntax

[GHC]

#10381: Type-checking failure with RankNTypes and RebindableSyntax
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        Reporter:  goldfire          |                   Owner:
            Type:  bug               |                  Status:  new
        Priority:  normal            |               Milestone:
       Component:  Compiler          |                 Version:  7.10.1
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  None/Unknown      |  Unknown/Multiple
      Blocked By:                    |               Test Case:
 Related Tickets:                    |                Blocking:
                                     |  Differential Revisions:
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Comment (by goldfire):

 Good point. But perhaps it's worth deviating from the report desugaring in
 the case where the LHS of the `<-` is a bare variable. Desugaring `a <- b;
 c` to `b >>= \a -> c` instead of the more verbose version seems to have
 the same runtime semantics but perhaps better compile-time behavior.

 Though this isn't ruining my day, as such, I'll name myself as a Real
 Client, for once, as this happened while doing something other than
 directly trying to befuddle GHC.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10381#comment:2>
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