{"ast_node_type":"other","tokens":[{"end":99,"kind":"keyword","start":0,"text":"tcx.mk_fn_sig([panic_info_ref_ty],"}]}
        tcx.mk_fn_sig([panic_info_ref_ty], tcx.types.never, false, fn_sig.safety, ExternAbi::Rust),
    let expected_sig = ty::Binder::bind_with_vars(
        bounds,