Handle malformed types in catch-on.

tests/language/on_catch_malformed_type_test.dart

Index: tests/language/on_catch_malformed_type_test.dart
diff --git a/tests/language/on_catch_malformed_type_test.dart b/tests/language/on_catch_malformed_type_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..ae5e0432f08a5440ed89ff1ab85622cfedc3b611
--- /dev/null
+++ b/tests/language/on_catch_malformed_type_test.dart
@@ -0,0 +1,56 @@
+// 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.
+
+// Check that malformed types in on-catch are handled correctly, that is
+// catches all in production mode and throws a type error in checked mode.
+
+isCheckedMode() {
+  try {
+    String s = 1;
+    return false;
+  } on TypeError catch(e) {
+    return true;
+  }
+}
+
+checkTypeError(f()) {
+  if(isCheckedMode()) {
+    try {
+      f();
+      Expect.fail("Type error expected in checking mode");
+    } on TypeError catch(ok) {
+    }
+  } else {
+    f();
+  }
+}
+
+catchUnresolvedBefore() {
+  try {
+    throw "foo";
+    Expect.fail("This code shouldn't be executed");
+  } on String catch(oks) {
+    // This is tested before the catch block below.
+  } on Unavailable catch(ex) {
+    Expect.fail("This code shouldn't be executed");
+  }
+}
+
+catchUnresolvedAfter() {
+  try {
+    throw "foo";
+    Expect.fail("This code shouldn't be executed");
+  } on Unavailable catch(ex) {
+    // This is tested before the catch block below.
+    // In production mode the test is always true, in checked mode
+    // it throws a type error.
+  } on String catch(oks) {
+    Expect.fail("This code shouldn't be executed");
+  }
+}
+
+main() {
+  catchUnresolvedBefore();
+  checkTypeError(catchUnresolvedAfter);
+}