{"ast_node_type":"other","tokens":[{"end":38,"kind":"keyword","start":0,"text":".map(Either::Left)"}]}
                    .map(Either::Left)
                if let Some(builtin) = BuiltinInt::from_suffix_sym(repr)
                    .or_else(|| BuiltinUint::from_suffix_sym(repr).map(Either::Right))