{"ast_node_type":"other","tokens":[{"end":64,"kind":"keyword","start":0,"text":"reason:"}]}
        reason: FutureIncompatibilityReason::FutureReleaseError,
    @future_incompatible = FutureIncompatibleInfo {
        reference: "issue #42868 <https://github.com/rust-lang/rust/issues/42868>",