{"ast_node_type":"other","tokens":[{"end":97,"kind":"keyword","start":0,"text":"ItemKind::Fn"}]}
            ItemKind::Fn { .. } | ItemKind::Impl(_) => ParamDefaultPolicy::FutureCompatForbidden,
            | ItemKind::Union(..) => ParamDefaultPolicy::Allowed,
            // Re. GCI, we're not bound by backward compatibility.