{"ast_node_type":"other","tokens":[{"end":59,"kind":"keyword","start":0,"text":"///"}]}
    /// Allows dyn upcasting trait objects via supertraits.
    (accepted, track_caller, "1.46.0", Some(47809)),
    /// Dyn upcasting is casting, e.g., `dyn Foo -> dyn Bar` where `Foo: Bar`.