GHC Panic: Visible type application + function type @(_ -> _)

$ ghci -XTypeApplications -ignore-dot-ghci
GHCi, version 8.3.20170605: http://www.haskell.org/ghc/  :? for help
Prelude> :t fmap @(_ -> _)
ghc: panic! (the 'impossible' happened)
  (GHC version 8.3.20170605 for x86_64-unknown-linux):
	repSplitAppTys
  w0_a1pF[tau:2]
  w0_a1pH[tau:2]
  []
  Call stack:
      CallStack (from HasCallStack):
        prettyCurrentCallStack, called at compiler/utils/Outputable.hs:1133:58 in ghc:Outputable
        callStackDoc, called at compiler/utils/Outputable.hs:1137:37 in ghc:Outputable
        pprPanic, called at compiler/types/Type.hs:809:9 in ghc:Type

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

Prelude> 

Doesn't happen with other types it seems, probably something to do with levity polymorphism.

Trac metadata

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