{"ast_node_type":"other","tokens":[{"end":37,"kind":"keyword","start":0,"text":"const"}]}
const SHARED_REF_MASK: u64 = 1 << 62;
const IMMUTABLE_MASK: u64 = 1 << 63; // the highest bit
const ALLOC_ID_MASK: u64 = u64::MAX & !IMMUTABLE_MASK & !SHARED_REF_MASK;