[GHC] #15038: Memory Corruption (strange closure type)

[GHC]

#15038: Memory Corruption (strange closure type)
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        Reporter:  andrewthad        |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:  8.6.1
       Component:  Compiler          |              Version:  8.4.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  Runtime crash     |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by andrewthad):

 The full original code is the `packed` repository (along with its test
 suite): https://github.com/andrewthad/packed.

 The minimal example repo I put up is just `packed` but with everything
 that wasn't needed to make the error happen stripped out. Here is an
 example of a parser that I build in the original code that doesn't cause
 errors:
 https://github.com/andrewthad/packed/blob/master/test/Parser.hs#L112-L122.
 None of the parsers from the original test suite ever cause crashes
 excepted for the trie-based one where a `Parser` is nested inside of a
 `Trie`, which causes a crash whenever the GC is run. Let me know if
 there's a way that I can clarify this further.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15038#comment:13>
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