Ghc panics while building stage2 with -dstg-lint

Building ghc at 54fda257 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)?

Trac metadata

Trac field	Value
Version	8.3
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
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