{"ast_node_type":"variable","tokens":[{"end":61,"kind":"keyword","start":0,"text":"if"}]}
                if let ty::Infer(ty::TyVar(vid)) = *ty.kind()
            fn visit_ty(&mut self, ty: Ty<'tcx>) -> Self::Result {
                    && let Some(def_id) = self.0.type_var_origin(vid).param_def_id