Bug report initTc: unsolved constraints "ghc.exe: panic! (the 'impossible' happened)"

Was asked to report this bug:

ghc.exe: panic! (the 'impossible' happened) (GHC version 8.0.2 for x86_64-unknown-mingw32): initTc: unsolved constraints WC {wc_insol = [W] evalVal_argX :: t_argW[tau:1] (CHoleCan: evalVal) [W] evalComb_arha :: t_arh9[tau:1] (CHoleCan: evalComb)}

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

Not really sure what the problem is, but it was fixable: basically just removed a random, not filled in function called "highOrderCheck"

in ` where evalEx = (.) flip (flip evalExpr) input = getInputVar vals inExpr (cutInputVal inVar)

highOrderCheck

-- this function removes all previous set values belonging to the function cutInputVal :: [InputVar] -> [InputVar] cutInputVal [] = [] `

so yeah, there ya go I guess?

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