{"ast_node_type":"variable","tokens":[{"end":82,"kind":"keyword","start":0,"text":"let"}]}
                    let bounds = bounds.first()?.span().to(bounds.last()?.span());
                    let bounds = impl_m.generics.bounds_for_param(impl_def_id).next()?.bounds;
                    let bounds = tcx.sess.source_map().span_to_snippet(bounds).ok()?;