{"ast_node_type":"other","tokens":[{"end":75,"kind":"keyword","start":0,"text":"(unstable,"}]}
    (unstable, nvptx_target_feature, "CURRENT_RUSTC_VERSION", Some(44839)),
    (unstable, movrs_target_feature, "1.88.0", Some(137976)),
    (unstable, powerpc_target_feature, "1.27.0", Some(44839)),