Optimizing code generator expects that every AST node is traversed once, i.e., the nodes are not ...

tests/language/src/AssignOpTest.dart

 // 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.
 // Dart test program for testing assign operators.
 
 
 class AssignOpTest {
   AssignOpTest() {}
 
   static testMain() {
@@ skipping 58 matching lines @@
 
     var y = 100;
     y += 1 << 3;
     Expect.equals(108, y);
     y *= 2 + 1;
     Expect.equals(324, y);
     y -= 3 - 2;
     Expect.equals(323, y);
     y += 3 * 4;
     Expect.equals(335, y);
+
+    var a = [1, 2, 3];
+    var ix = 0;
+    a[ix] |= 12;
+    Expect.equals(13, a[ix]);
   }
 
   static var f;
   var instf;
 }
 main() {
-  AssignOpTest.testMain();
+  for (int i = 0; i < 2000; i++) {
+    AssignOpTest.testMain();
+  }
 }