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GHC panics, -XTypeInType, possibly "cobox" related

    • Closed Issue created by Gabor Greif @ggreif

    I get

    GHCi, version 8.1.20160902: http://www.haskell.org/ghc/  :? for help
[1 of 1] Compiling Tree             ( src/Tree.hs, interpreted )
ghc: panic! (the 'impossible' happened)
  (GHC version 8.1.20160902 for x86_64-apple-darwin):
	tcTyVarDetails
  cobox_a15m :: (n_a159[ssk] :: Peano) ~# ('Z :: Peano)

    on the attached file.

    Trac metadata
    Trac field Value
    Version 8.1
    Type Bug
    TypeOfFailure OtherFailure
    Priority normal
    Resolution Unresolved
    Component Compiler
    Test case
    Differential revisions
    BlockedBy
    Related
    Blocking
    CC
    Operating system
    Architecture
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