Ensure libraries always have at least one top-level class and therefore at least one script.

tests/lib/lib.status

 # Copyright (c) 2012, 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.
 
 [ $unchecked ]
 mirrors/redirecting_factory_different_type_test: SkipByDesign # Tests type checks.
 
 [ $compiler == dart2js ]
 async/schedule_microtask6_test: RuntimeError # global error handling is not supported. Issue 5958
 
 math/double_pow_test: RuntimeError
 math/low_test: RuntimeError
 math/random_big_test: RuntimeError  # Using bigint seeds for random.
 
 mirrors/abstract_class_test: RuntimeError # Issue 12826
 mirrors/class_declarations_test/none: RuntimeError # Issue 13440
 mirrors/class_mirror_location_test: RuntimeError # Issue 6490
 mirrors/closurization_equivalence_test: RuntimeError # Issue 6490
 mirrors/constructor_kinds_test: RuntimeError # Issue 13799
 mirrors/constructor_private_name_test: CompileTimeError # Issue 13597
 mirrors/deferred_type_test: RuntimeError # Issue 6335
+mirrors/empty_test: RuntimeError # Issue 6490
 mirrors/enum_test: RuntimeError # Issue 6490
 mirrors/fake_function_with_call_test: RuntimeError # Issue 11612
 mirrors/fake_function_without_call_test: RuntimeError # Issue 11612
 mirrors/function_type_mirror_test: RuntimeError # Issue 12166
 mirrors/generic_f_bounded_mixin_application_test: RuntimeError # Issue 12087
 mirrors/generic_function_typedef_test: RuntimeError # Issue 12333
 mirrors/generic_interface_test: RuntimeError # Issue 12087
 mirrors/generic_local_function_test: RuntimeError # Issue 12333
 mirrors/generic_mixin_test: RuntimeError # Issue 12333
 mirrors/generic_mixin_applications_test: RuntimeError # Issue 12333
@@ skipping 192 matching lines @@
 
 [ $runtime == vm ]
 async/timer_not_available_test: Fail, OK
 mirrors/native_class_test: Fail, OK # This test is meant to run in a browser.
 mirrors/deferred_type_test: CompileTimeError, OK # Don't have a multitest marker for dynamic compile time errors.
 
 [ $compiler == none ]
 async/timer_not_available_test: SkipByDesign # only meant to test when there is no way to implement timer (currently only in d8)
 
 mirrors/symbol_validation_test: RuntimeError # Issue 13596
-mirrors/mirrors_reader_test: Crash #Issue 23483
 
 mirrors/mirrors_used*: SkipByDesign # Invalid tests. MirrorsUsed does not have a specification, and dart:mirrors is not required to hide declarations that are not covered by any MirrorsUsed annotation.
 
 [ $compiler == none && ( $runtime == drt || $runtime == dartium || $runtime == ContentShellOnAndroid) ]
 async/schedule_microtask6_test: Fail # Issue 10910
 async/timer_test: Fail, Pass # Issue 15487
 async/multiple_timer_test: Fail, Pass # Issue 15487
 async/stream_periodic3_test: Fail, Pass # Issue 15487
 async/timer_isActive_test: Fail, Pass # Issue 22352
 mirrors/immutable_collections_test: SkipSlow # Dartium debug uses -O0, so this will just timeout and waste bot cycles.
@@ skipping 391 matching lines @@
 typed_data/float32x4_shuffle_test: Crash # Instance of 'TypeOperator': type check unimplemented for _Nullary.
 typed_data/float32x4_test: Crash # Instance of 'TypeOperator': type check unimplemented for _Nullary.
 typed_data/int32x4_list_test: Crash # Instance of 'TypeOperator': type check unimplemented for List<Int32x4>.
 typed_data/int32x4_test: Crash # Instance of 'TypeOperator': type check unimplemented for _Nullary.
 typed_data/typed_data_hierarchy_int64_test: Crash # Instance of 'TypeOperator': type check unimplemented for List<int>.
 typed_data/typed_data_hierarchy_test: Crash # Instance of 'TypeOperator': type check unimplemented for List<double>.
 typed_data/typed_data_list_test: Crash # Instance of 'TypeOperator': type check unimplemented for _Nullary.
 typed_data/typed_data_sublist_type_test: Crash # Instance of 'TypeOperator': type check unimplemented for T.
 typed_data/typed_list_iterable_test: Crash # Instance of 'TypeOperator': type check unimplemented for _Nullary.
 profiler/metrics_num_test : Crash # Instance of 'TypeOperator': type check unimplemented for _Nullary.