Set pp::colors false Variable T : Type Variable R : Type Variable t2r : T -> R Coercion t2r Variable g : R -> R -> R Variable a : T Show g a a Variable b : R Show g a b Show g b a Set lean::pp::coercion true Show g a a Show g a b Show g b a Set lean::pp::coercion false Variable S : Type Variable s : S Variable r : S Variable h : S -> S -> S Infixl 10 ++ : g Infixl 10 ++ : h Set lean::pp::notation false Show a ++ b ++ a Show r ++ s ++ r Check a ++ b ++ a Check r ++ s ++ r Set lean::pp::coercion true Show a ++ b ++ a Show r ++ s ++ r Set lean::pp::notation true Show a ++ b ++ a Show r ++ s ++ r