{"ast_node_type":"variable","tokens":[{"end":63,"kind":"keyword","start":0,"text":"let"}]}
    let Ok(impl2_args) = infcx.fully_resolve(impl2_args) else {
    let _ = ocx.resolve_regions_and_report_errors(impl1_def_id, param_env, assumed_wf_types);
        let span = tcx.def_span(impl1_def_id);