Test equality argument order in iterable.

tests/corelib/list_contains_argument_order_test.dart

Index: tests/corelib/list_contains_argument_order_test.dart
diff --git a/tests/corelib/list_contains_argument_order_test.dart b/tests/corelib/list_contains_argument_order_test.dart
new file mode 100644
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+++ b/tests/corelib/list_contains_argument_order_test.dart
@@ -0,0 +1,43 @@
+// Copyright (c) 2013, 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 "package:expect/expect.dart";
+
+class A {
+  const A();
+  bool operator ==(A other) {
+    return false;
+  }
+}
+
+class B {
+  bool operator ==(B other) {
+    Expect.fail("Bad equality order.");
+  }
+}
+
+main() {
+
+  test(iterable) {
+    Expect.isFalse(iterable.contains(new B()));
+  }
+
+  var iterables = [
+    <A>[ new A() ],
+    new List<A>(1)..[0] = new A(),
+    new List<A>()..add(new A()),
+    const <A>[ const A() ],
+    new Set()..add(new A()),
+    (new Map()..[new A()] = 0).keys,
+    (new Map()..[0] = new A()).values];
+int i = 0;
+  for (var iterable in iterables) {
+    print(i++);
+    test(iterable);
+    print(i++);
+    test(iterable.map((x) => x));
+    print(i++);
+    test(iterable.take(1));
+  }
+}