{"ast_node_type":"other","tokens":[{"end":51,"kind":"keyword","start":0,"text":"self.zip_tys(variance,"}]}
                self.zip_tys(variance, ty_a, ty_b)?
            (TyKind::Array(ty_a, const_a), TyKind::Array(ty_b, const_b)) if const_a == const_b => {
            }