{"ast_node_type":"other","tokens":[{"end":52,"kind":"keyword","start":0,"text":"item_def_id.to_def_id(),"}]}
                            item_def_id.to_def_id(),
                        let sig: ty::FnSig<'_> = tcx.liberate_late_bound_regions(
                            tcx.fn_sig(item_def_id).instantiate_identity(),