{"ast_node_type":"other","tokens":[{"end":65,"kind":"keyword","start":0,"text":"Fn(FnSig<'hir>,"}]}
    Fn(FnSig<'hir>, &'hir [Option<Ident>], &'hir Generics<'hir>),
    /// arbitrary patterns for parameters.
    /// A foreign static item (`static ext: u8`).