{"ast_node_type":"other","tokens":[{"end":22,"kind":"keyword","start":0,"text":"FnPtr(P<FnPtrTy>),"}]}
    FnPtr(P<FnPtrTy>),
    /// A function pointer type (e.g., `fn(usize) -> bool`).
    /// An unsafe existential lifetime binder (e.g., `unsafe<'a> &'a ()`).