{"ast_node_type":"other","tokens":[{"end":70,"kind":"keyword","start":0,"text":"Some(tcx.type_of(self.def_id).map_bound(|t|"}]}
                Some(tcx.type_of(self.def_id).map_bound(|t| t.into()))
            GenericParamDefKind::Type { has_default: true, .. } => {
            }