[GHC] #14034: GHC crash instead of compile error on GHC 8.2 with ApplicativeDo

[GHC]

#14034: GHC crash instead of compile error on GHC 8.2 with ApplicativeDo
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        Reporter:  nh2               |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.2.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Compile-time      |  Unknown/Multiple
  crash or panic                     |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by nh2):

 {{{
 sam2_: I'd just like to note that this also happens to valid code; the
 undefined names aren't essential to reproduction
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14034#comment:1>
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