[GHC] #14536: Ghc panics while building stage2 with -dstg-lint

[GHC]

#14536: Ghc panics while building stage2 with -dstg-lint
-------------------------------------+-------------------------------------
           Reporter:  duog           |             Owner:  (none)
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:
          Component:  Compiler       |           Version:  8.3
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
-------------------------------------+-------------------------------------
 Building ghc at 54fda257d4a7bfddaa0c1fa0be698d1a849c4124 with the
 following mk/build.mk:
 {{{
 BuildFlavour = validate

 ifneq "$(BuildFlavour)" ""
 include mk/flavours/$(BuildFlavour).mk
 endif

 GhcStage2HcOpts    +=  -dcore-lint -dstg-lint -dcmm-lint
 }}}
 building with:
 {{{
 make compiler/stage2/build/Exception.o
 }}}
 panics with:
 {{{
 ghc-stage1: panic! (the 'impossible' happened)
   (GHC version 8.3.20171127 for x86_64-unknown-linux):
         ASSERT failed!
   dataConInstArgTys Unit#
   [k0_10, a_11]
   ['TupleRep '[], 'IntRep, State# RealWorld, Int#]
   Call stack:
       CallStack (from HasCallStack):
         callStackDoc, called at compiler/utils/Outputable.hs:1208:22 in
 ghc:Outputable
         assertPprPanic, called at compiler/basicTypes/DataCon.hs:1256:76
 in ghc:DataCon
   Call stack:
       CallStack (from HasCallStack):
         callStackDoc, called at compiler/utils/Outputable.hs:1150:37 in
 ghc:Outputable
         pprPanic, called at compiler/utils/Outputable.hs:1206:5 in
 ghc:Outputable
         assertPprPanic, called at compiler/basicTypes/DataCon.hs:1256:76
 in ghc:DataCon

 Please report this as a GHC bug:  http://www.haskell.org/ghc/reportabug
 }}}

 Once this is resolved, is there any reason that -dstg-ling and -dcmm-lint
 are not set on validate (at least with SLOW)?

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14536>
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