{"ast_node_type":"other","tokens":[{"end":93,"kind":"keyword","start":0,"text":"fcx.register_infer_ok_obligations(fcx.infcx.replace_opaque_types_with_inference_vars("}]}
        fcx.register_infer_ok_obligations(fcx.infcx.replace_opaque_types_with_inference_vars(
    let ret_ty =
            declared_ret_ty,