{"ast_node_type":"variable","tokens":[{"end":58,"kind":"keyword","start":0,"text":"let"}]}
                    let edition = self.tcx.sess.edition();
                def::Res::Def(DefKind::Trait, def_id) => {
                    Some(Arc::new(SyntaxExtension::glob_delegation(def_id, impl_def_id, edition)))