{"ast_node_type":"variable","tokens":[{"end":92,"kind":"keyword","start":0,"text":"let"}]}
    let assumed_wf_types = ocx.assumed_wf_types_and_report_errors(param_env, impl1_def_id)?;
    let _ = ocx.resolve_regions_and_report_errors(impl1_def_id, param_env, assumed_wf_types);