{"ast_node_type":"other","tokens":[{"end":58,"kind":"keyword","start":0,"text":"(unstable,"}]}
    (unstable, rtm_target_feature, "1.35.0", Some(44839)),
    (unstable, riscv_target_feature, "1.45.0", Some(44839)),
    (unstable, s390x_target_feature, "1.82.0", Some(44839)),