{"ast_node_type":"other","tokens":[{"end":99,"kind":"keyword","start":0,"text":"reason:"}]}
        reason: FutureIncompatibilityReason::Custom("the behavior may change in a future release"),
    @future_incompatible = FutureIncompatibleInfo {
        reference: "issue #56105 <https://github.com/rust-lang/rust/issues/56105>",