{"ast_node_type":"other","tokens":[{"end":66,"kind":"keyword","start":0,"text":"//"}]}
            // Re. GCI, we're not bound by backward compatibility.
            ItemKind::Fn { .. } | ItemKind::Impl(_) => ParamDefaultPolicy::FutureCompatForbidden,
            ItemKind::Const(..) => ParamDefaultPolicy::Forbidden,