We handle cyclic references. No need to skip this test anymore.

tests/co19/co19-leg.status

 # Copyright (c) 2011, 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.
 
 [ $component == dart2js && $system == macos ]
 LibTest/core/Math/acos_A01_t01: Fail, OK
 LibTest/core/Math/asin_A01_t01: Fail, OK
 LibTest/core/Math/atan_A01_t01: Fail, OK
 
 
@@ skipping 16 matching lines @@
 [ $component == dart2js && $checked ]
 # Leg does not support checked mode yet.
 *: Skip
 
 
 [ $component == legium ]
 *: Skip
 
 
 [ $component == dart2js ]
-Language/10_Expressions/01_Constants_A17_t03: Skip # Cycle reference. Times out.
-
 
 #
 # Issues with co19 test suite.
 #
 # If you add anything here, either file a bug against the Dart
 # langauge specification, co19 test suite, or add a comment that ahe
 # can understand so he can file a bug later.
 #
 Language/10_Expressions/01_Constants_A15_t01: Fail, OK # Assumes interpolations can't be constant.
 Language/10_Expressions/03_Numbers_A01_t06: Fail, OK # Requires bigint.
@@ skipping 464 matching lines @@
 Language/12_Libraries_and_Scripts/1_Imports_A07_t02: Fail, OK # @compile-error
 Language/12_Libraries_and_Scripts/2_Includes_A01_t01: Fail, OK # @compile-error
 Language/12_Libraries_and_Scripts/2_Includes_A03_t02: Fail, OK # @compile-error
 Language/12_Libraries_and_Scripts/2_Includes_A03_t03: Fail, OK # @compile-error
 Language/13_Types/1_Static_Types_A02_t08: Fail, OK # @compile-error
 Language/13_Types/3_Type_Declarations/1_Typedef_A06_t01: Fail, OK # @compile-error
 Language/13_Types/3_Type_Declarations/1_Typedef_A06_t02: Fail, OK # @compile-error
 Language/13_Types/3_Type_Declarations/1_Typedef_A06_t03: Fail, OK # @compile-error
 Language/13_Types/3_Type_Declarations/1_Typedef_A06_t04: Fail, OK # @compile-error
 Language/13_Types/7_Type_Void_A01_t02: Fail, OK # @compile-error