{"ast_node_type":"other","tokens":[{"end":56,"kind":"keyword","start":0,"text":"(unstable,"}]}
    (unstable, with_negative_coherence, "1.60.0", None),
    /// rustc_strict_coherence value.
    // !!!!    !!!!    !!!!    !!!!   !!!!    !!!!    !!!!    !!!!    !!!!    !!!!    !!!!