ppr_mono_ty _    (HsExplicitTupleTy _ tys) = quote $ parens (interpp'SP tys)
ppr_mono_ty _    (HsExplicitTupleTy _ tys) = quote $ parens (interpp'SP tys)
ppr_mono_ty _    (HsExplicitTupleTy _ tys) = quote $ parens (interpp'SP tys)