{"ast_node_type":"variable","tokens":[{"end":96,"kind":"keyword","start":0,"text":"let"}]}
        let _span = enter_trace_span!(M, layouting::fn_abi_of_instance, ?instance, ?extra_args);
    ) -> <Self as FnAbiOfHelpers<'tcx>>::FnAbiOfResult {
        FnAbiOf::fn_abi_of_instance(self, instance, extra_args)