{"ast_node_type":"other","tokens":[{"end":58,"kind":"keyword","start":0,"text":"///"}]}
    /// `Fn() -> &'static dyn Debug` requires parentheses:
    /// E.g., adding `+ 'static` after `Fn() -> dyn Future<Output = ()>` or
    /// `Fn() -> (dyn Future<Output = ()>) + 'static` and