{"ast_node_type":"other","tokens":[{"end":42,"kind":"keyword","start":0,"text":"///"}]}
    /// arbitrary patterns for parameters.
    /// and `FnPtrTy`. The sharing is due to all of these cases not allowing
    Fn(FnSig<'hir>, &'hir [Option<Ident>], &'hir Generics<'hir>),