Mark test as runtime failure

pkg/dev_compiler/test/browser/language_tests.js

 // Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 define(['dart_sdk', 'async_helper', 'expect', 'unittest', 'require'],
       function(dart_sdk, async_helper, expect, unittest, require) {
   'use strict';
 
   async_helper = async_helper.async_helper;
   let minitest = expect.minitest;
@@ skipping 250 matching lines @@
       'nested_switch_label_test': skip_fail,
       'number_identifier_test_05_multi': skip_fail,
       'number_identity2_test': skip_fail,
       'numbers_test': skip_fail,
       'optimized_hoisting_checked_mode_assert_test': skip_fail,
       'redirecting_factory_reflection_test': skip_fail,
       'regress_13462_0_test': skip_fail,
       'regress_13462_1_test': skip_fail,
       'regress_14105_test': skip_fail,
       'regress_16640_test': skip_fail,
+      'regress_18535_test': fail,
       'regress_21795_test': skip_fail,
       'regress_22443_test': skip_fail,
       'regress_22666_test': skip_fail,
       'setter_no_getter_test_01_multi': skip_fail,
       'stack_overflow_stacktrace_test': skip_fail,
       'stack_overflow_test': skip_fail,
       'stack_trace_test': skip_fail,
       'stacktrace_rethrow_nonerror_test': skip_fail, // mismatch from Karma's file hash
       'stacktrace_rethrow_error_test_none_multi': skip_fail,
       'stacktrace_rethrow_error_test_withtraceparameter_multi': skip_fail,
@@ skipping 550 matching lines @@
 
     for (let action of unittest_tests) {
       try {
         action();
       } catch (e) {
         console.error("Caught error tying to setup test:", e);
       }
     }
   });
 });