fix list_test for strong mode, and fix DDC List constructors

tests/corelib_2/list_concurrent_modify_test.dart

Index: tests/corelib_2/list_concurrent_modify_test.dart
diff --git a/tests/corelib_2/list_concurrent_modify_test.dart b/tests/corelib_2/list_concurrent_modify_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..b3fcb17f4dfe0a66dd550bc3b3e326658d8c78a1
--- /dev/null
+++ b/tests/corelib_2/list_concurrent_modify_test.dart
@@ -0,0 +1,91 @@
+// 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.
+
+import "dart:collection";
+import "dart:typed_data";
+import "package:expect/expect.dart";
+
+void main() {
+  // Growable lists. Initial length 0.
+  testConcurrentModification(new List());
+  testConcurrentModification(new List<int>().toList());
+  testConcurrentModification(new List<int>(0).toList());
+  testConcurrentModification(new List.filled(0, null, growable: true));
+  testConcurrentModification([]);
+  testConcurrentModification(new List.from(const []));
+  testConcurrentModification(new MyList([]));
+  testConcurrentModification(new MyList<int>([]).toList());
+
+  testConcurrentModification(new Uint8List(0).toList());
+  testConcurrentModification(new Int8List(0).toList());
+  testConcurrentModification(new Uint16List(0).toList());
+  testConcurrentModification(new Int16List(0).toList());
+  testConcurrentModification(new Uint32List(0).toList());
+  testConcurrentModification(new Int32List(0).toList());
+}
+
+void testConcurrentModification(List<int> list) {
+  // add, removeLast.
+  list.clear();
+  list.addAll([1, 2, 3, 2, 7, 9, 9, 7, 2, 3, 2, 1]);
+
+  // Operations that change the length cause ConcurrentModificationError.
+  void testModification(action()) {
+    testIterator(int when) {
+      list.length = 4;
+      list.setAll(0, [0, 1, 2, 3]);
+      Expect.throws(() {
+        for (var element in list) {
+          if (element == when) action();
+        }
+      }, (e) => e is ConcurrentModificationError);
+    }
+
+    testForEach(int when) {
+      list.length = 4;
+      list.setAll(0, [0, 1, 2, 3]);
+      Expect.throws(() {
+        list.forEach((var element) {
+          if (element == when) action();
+        });
+      }, (e) => e is ConcurrentModificationError);
+    }
+
+    // Test the change at different points of the iteration.
+    testIterator(0);
+    testIterator(1);
+    testIterator(3);
+    testForEach(0);
+    testForEach(1);
+    testForEach(3);
+  }
+
+  testModification(() => list.add(5));
+  testModification(() => list.addAll([5, 6]));
+  testModification(() => list.removeLast());
+  for (int i = 0; i < 4; i++) {
+    testModification(() => list.remove(i));
+    testModification(() => list.removeAt(i));
+    testModification(() => list.removeWhere((x) => x == i));
+    testModification(() => list.retainWhere((x) => x != i));
+    testModification(() => list.insert(i, 5));
+    testModification(() => list.insertAll(i, [5, 6]));
+    testModification(() => list.removeRange(i, i + 1));
+    testModification(() => list.replaceRange(i, i + 1, [5, 6]));
+  }
+}
+
+class MyList<E> extends ListBase<E> {
+  List<E> _source;
+  MyList(this._source);
+  int get length => _source.length;
+  void set length(int length) {
+    _source.length = length;
+  }
+
+  E operator [](int index) => _source[index];
+  void operator []=(int index, E value) {
+    _source[index] = value;
+  }
+}