[GHC] #13242: Panic "StgCmmEnv: variable not found" with ApplicativeDo and ExistentialQuantification

[GHC]

#13242: Panic "StgCmmEnv: variable not found" with ApplicativeDo and
ExistentialQuantification
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        Reporter:  ljli              |                Owner:  simonmar
            Type:  bug               |               Status:  new
        Priority:  highest           |            Milestone:  8.2.1
       Component:  Compiler          |              Version:  8.1
      Resolution:                    |             Keywords:
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 Simon Marlow <marlowsd@…>):

 In [changeset:"d118807d141abe4031fdcb1a4db3596dac00c7c7/ghc" d118807/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="d118807d141abe4031fdcb1a4db3596dac00c7c7"
 Document interaction between ApplicativeDo and existentials (#13242)

 Test Plan: validate

 Reviewers: austin, bgamari, erikd

 Subscribers: thomie

 Differential Revision: https://phabricator.haskell.org/D3256
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13242#comment:19>
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