{"ast_node_type":"variable","tokens":[{"end":81,"kind":"keyword","start":0,"text":"let"}]}
                    let s_b = s_c.const_.try_eval_bool(tcx, typing_env).unwrap();
                    let f_b = f_c.const_.try_eval_bool(tcx, typing_env).unwrap();
                    if f_b == s_b {