{"ast_node_type":"variable","tokens":[{"end":53,"kind":"keyword","start":0,"text":"let"}]}
                let bounds = &*tcx.arena.alloc_slice(
                let item_ty = Ty::new_opaque(tcx, def_id.to_def_id(), args);
                    &opaque_type_bounds(tcx, def_id, bounds, item_ty, *span, filter)