[GHC] #11607: ApplicativeDo easily foiled with `pure`

[GHC]

#11607: ApplicativeDo easily foiled with `pure`
-------------------------------------+-------------------------------------
        Reporter:  bgamari           |                Owner:
            Type:  bug               |               Status:  new
        Priority:  high              |            Milestone:  8.0.1
       Component:  Compiler (Type    |              Version:  8.0.1-rc2
  checker)                           |
      Resolution:                    |             Keywords:  ApplicativeDo
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  GHC rejects       |  Unknown/Multiple
  valid program                      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
-------------------------------------+-------------------------------------
Changes (by ocharles):

 * cc: ocharles (added)


--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11607#comment:1>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler