{"ast_node_type":"variable","tokens":[{"end":67,"kind":"keyword","start":0,"text":"let"}]}
            let alloc = tcx.global_alloc(alloc_id).unwrap_memory();
            let n = n.try_to_target_usize(tcx).unwrap();
            // cast is ok because we already checked for pointer size (32 or 64 bit) above