[GHC] #14249: ApplicativeDo: Pattern matching on a bind forces a Monad constraint

[GHC]

#14249: ApplicativeDo: Pattern matching on a bind forces a Monad constraint
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        Reporter:  mutantmell  |                Owner:  (none)
            Type:  bug         |               Status:  new
        Priority:  normal      |            Milestone:
       Component:  Compiler    |              Version:  8.2.1
      Resolution:              |             Keywords:  ApplicativeDo
Operating System:  Linux       |         Architecture:  x86_64 (amd64)
 Type of failure:  Other       |            Test Case:
      Blocked By:              |             Blocking:
 Related Tickets:              |  Differential Rev(s):
       Wiki Page:              |
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Comment (by mutantmell):

 Adding the `~` to my pattern match changes the constraint, so it looks
 like it is due to #13875.

 I'll close the bug.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14249#comment:2>
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