[GHC] #15002: Panic: collectNBinders

[GHC]

#15002: Panic: collectNBinders
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        Reporter:  crockeea          |                Owner:  nomeata
            Type:  bug               |               Status:  patch
        Priority:  highest           |            Milestone:  8.4.2
       Component:  Profiling         |              Version:  8.4.1
      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):  Phab:D4572
       Wiki Page:                    |
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Comment (by Joachim Breitner <mail@…>):

 In [changeset:"ae0cff0a1834d8b041b06d0e1ab6ce969aac44c8/ghc"
 ae0cff0a/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="ae0cff0a1834d8b041b06d0e1ab6ce969aac44c8"
 CSE: Walk past join point lambdas (#15002)

 As the CSE transformation traverses the syntax tree, it needs to go past
 the lambdas of a join point, and only look for CSE opportunities inside,
 as a join point’s lambdas must be preserved. Simple fix; comes with a
 Note and a test case.

 Thanks to Ryan Scott for an excellently minimized test case, and for
 bisecting GHC.

 Differential Revision: https://phabricator.haskell.org/D4572
 }}}

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15002#comment:15>
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