Make test of malformed types a dynamic type error.

tests/language/malformed2_lib.dart

+// 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.
+
+part of malformed_test;
+
+/// [o] is either `null` or `new List<String>()`.
+void testValue(var o) {
+  assert(o == null || o is List<String>);
+
+  test(true, () => o is Unresolved, "$o is Unresolved");
+  test(false, () => o is List<Unresolved>, "$o is List<Unresolved>");
+  test(true, () => o is! Unresolved, "$o is! Unresolved");
+  test(false, () => o is! List<Unresolved>, "$o is List<Unresolved>");
+
+  test(true, () => o as Unresolved, "$o as Unresolved");
+  test(false, () => o as List<Unresolved>, "$o as List<Unresolved>");
+
+  test(false, () {
+    try {
+    } on Unresolved catch (e) {
+    } catch (e) {
+    }
+  }, "on Unresolved catch: Nothing thrown.");
+  test(true, () {
+    try {
+      throw o;
+    } on Unresolved catch (e) {
+    } catch (e) {
+    }
+  }, "on Unresolved catch ($o)");
+  test(false, () {
+    try {
+      throw o;
+    } on List<String> catch (e) {
+    } on NullThrownError catch (e) {
+    } on Unresolved catch (e) {
+    } catch (e) {
+    }
+  }, "on List<String>/NullThrowError catch ($o)");
+  test(false, () {
+    try {
+      throw o;
+    } on List<Unresolved> catch (e) {
+    } on NullThrownError catch (e) {
+    } on Unresolved catch (e) {
+    } catch (e) {
+    }
+  }, "on List<Unresolved>/NullThrowError catch ($o)");
+
+  test(o != null && inCheckedMode(),
+       () { Unresolved u = o; },
+       "Unresolved u = $o;");
+  test(false,
+       () { List<Unresolved> u = o; },
+       "List<Unresolved> u = $o;");
+}