panic: kindFunResult ghc-prim:GHC.Prim.*{(w) tc 34d}

This code:

f :: (Num Int => Num) () => ()
f = undefined

make ghc panic:

$ ghci q.hs
GHCi, version 7.7.20130421: http://www.haskell.org/ghc/  :? for help
Loading package ghc-prim ... linking ... done.
Loading package integer-gmp ... linking ... done.
Loading package base ... linking ... done.
[1 of 1] Compiling Main             ( q.hs, interpreted )
ghc-stage2: panic! (the 'impossible' happened)
  (GHC version 7.7.20130421 for x86_64-unknown-linux):
        kindFunResult ghc-prim:GHC.Prim.*{(w) tc 34d}

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

>

Trac metadata

Trac field	Value
Version	7.6.3
Type	Bug
TypeOfFailure	OtherFailure
Priority	high
Resolution	Unresolved
Component	Compiler (Type checker)
Test case
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panic: kindFunResult ghc-prim:GHC.Prim.*{(w) tc 34d}