Add TypeImpl.hashCode.

tests/compiler/dart2js_extra/first_class_types_hashcode_test.dart

Index: tests/compiler/dart2js_extra/first_class_types_hashcode_test.dart
diff --git a/tests/compiler/dart2js_extra/first_class_types_hashcode_test.dart b/tests/compiler/dart2js_extra/first_class_types_hashcode_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..2c5d989184caeadb0620322257221e2f90be2b40
--- /dev/null
+++ b/tests/compiler/dart2js_extra/first_class_types_hashcode_test.dart
@@ -0,0 +1,22 @@
+// 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.
+
+// Check that Type instances work with maps.

[ngeoffray, 2012/11/19 15:40:32]

Please add the comment that it assumes canonicalization of types and that is not
specified.

+
+class A {}
+
+class B<T> {}
+
+main() {
+  Map<Type, String> map = new Map<Type, String>();
+  A a = new A().runtimeType;
+  B b1 = new B<int>().runtimeType;
+  B b2 = new B<String>().runtimeType;
+  map[a] = 'A';
+  map[b1] = 'B<int>';
+  map[b2] = 'B<String>';
+  Expect.equals('A', map[new A().runtimeType]);
+  Expect.equals('B<int>', map[new B<int>().runtimeType]);
+  Expect.equals('B<String>', map[new B<String>().runtimeType]);
+}