{"ast_node_type":"other","tokens":[{"end":70,"kind":"keyword","start":0,"text":"Some(param_env.and(infer::ValuePairs::PolySigs(ExpectedFound"}]}
        Some(param_env.and(infer::ValuePairs::PolySigs(ExpectedFound {
        trait_err_span.map(|sp| (sp, Cow::from("type in trait"), false)),
            expected: ty::Binder::dummy(trait_sig),