{"ast_node_type":"variable","tokens":[{"end":89,"kind":"keyword","start":0,"text":"let"}]}
        let _span = enter_trace_span!(M, layouting::fn_abi_of_fn_ptr, ?sig, ?extra_args);
    ) -> <Self as FnAbiOfHelpers<'tcx>>::FnAbiOfResult {
        FnAbiOf::fn_abi_of_fn_ptr(self, sig, extra_args)