{"ast_node_type":"variable","tokens":[{"end":48,"kind":"keyword","start":0,"text":"let"}]}
    let mut hash: XxHash64 = Default::default();
    // xxHash64 of the type metadata identifier. (See llvm/llvm-project@cff5bef.)
    hash.write(itanium_cxx_abi::typeid_for_instance(tcx, instance, options).as_bytes());