{"ast_node_type":"variable","tokens":[{"end":95,"kind":"keyword","start":0,"text":"let"}]}
                            let (_, third_expected_ty) = formal_and_expected_inputs[third_idx];
                            let (_, second_expected_ty) = formal_and_expected_inputs[second_idx];
                            let span = if let (Some((_, first_span)), Some((_, third_span))) = (