panic

GHCi, version 8.4.3: http://www.haskell.org/ghc/  :? for help
Prelude> :print getChar >>= return
ghc.exe: panic! (the 'impossible' happened)
  (GHC version 8.4.3 for x86_64-unknown-mingw32):
        isUnliftedType
  t1_a1tM[rt] :: TYPE t_a1tL[rt]
  Call stack:
      CallStack (from HasCallStack):
        callStackDoc, called at compiler\utils\Outputable.hs:1150:37 in ghc:Outputable
        pprPanic, called at compiler\\types\\Type.hs:1939:10 in ghc:Type

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

Trac metadata

Trac field	Value
Version	8.6.1
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
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