{"ast_node_type":"other","tokens":[{"end":83,"kind":"keyword","start":0,"text":"(ImplSubject::Trait(trait_ref_a),"}]}
            (ImplSubject::Trait(trait_ref_a), ImplSubject::Trait(trait_ref_b)) => {
        match (a, b) {
                ToTrace::to_trace(cause, trait_ref_a, trait_ref_b)