Error message: (%,%) shows up when with accidental paren

I accidentally wrote an extra closing parens in instance declaration

$ ghci -ignore-dot-ghci -XRankNTypes
GHCi, version 8.2.1: http://www.haskell.org/ghc/  :? for help
Prelude> class (Category (Src f), forall xx. xx => Eq xx)) => Functor f

<interactive>:1:8: error:
    Unexpected type ‘Category (Src f)’
    In the class declaration for ‘GHC.Classes.(%,%)’
    A class declaration should have form
      class GHC.Classes.(%,%) a b where ...
Prelude> 

(%,%) shouldn't show up here, same happens on 8.5.20180105