{"ast_node_type":"variable","tokens":[{"end":73,"kind":"keyword","start":0,"text":"let"}]}
                let &ty::Tuple(inputs) = tuplized_inputs[0].kind() else {
                assert_eq!(tuplized_inputs.len(), 1, "multiple closure inputs");
                    bug!("closure inputs not a tuple: {:?}", tuplized_inputs[0]);