[GHC] #14807: GHC does not pass -dstg-lint

[GHC]

#14807: GHC does not pass -dstg-lint
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           Reporter:  sergv          |             Owner:  (none)
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:
          Component:  Compiler       |           Version:  8.4.1-alpha3
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  Building GHC
  Unknown/Multiple                   |  failed
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 When building ghc-8.4 branch with -dstg-lint enabled I got a GHC panic
 error (please see attachment as it's really big). The error is
 reproducible on Windows and Debian Linux 64 bit operating systems.

 As a side note, it seems that it would be good to enable `-dstg-lint` and
 `-dcmm-lint` in `devel2` flavour, and possibly some other flavours, or at
 least on CI, so that they will be tested more frequently.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14807>
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