Migrate test block 8 to Dart 2.0.

tests/corelib_2/from_environment_const_type_undefined_test.dart

Index: tests/corelib_2/from_environment_const_type_undefined_test.dart
diff --git a/tests/corelib_2/from_environment_const_type_undefined_test.dart b/tests/corelib_2/from_environment_const_type_undefined_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..c555b027a27ebcc470b846baa5d5d89e627313bf
--- /dev/null
+++ b/tests/corelib_2/from_environment_const_type_undefined_test.dart
@@ -0,0 +1,42 @@
+// Copyright (c) 2014, 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 Foo {}
+
+const
+    bool //  //# 01: ok
+    int //   //# 02: compile-time error
+    String //# 03: compile-time error
+    Foo //   //# 04: compile-time error
+    a = const bool.fromEnvironment('a');
+
+const
+    bool //  //# 05: ok
+    int //   //# 06: compile-time error
+    String //# 07: compile-time error
+    Foo //   //# 08: compile-time error
+    b = const bool.fromEnvironment('b');
+
+const
+    bool //  //# 09: compile-time error
+    int //   //# 10: ok
+    String //# 11: compile-time error
+    Foo //   //# 12: compile-time error
+    c = const int.fromEnvironment('c');
+
+const
+    bool //  //# 13: compile-time error
+    int //   //# 14: compile-time error
+    String //# 15: ok
+    Foo //   //# 16: compile-time error
+    d = const String.fromEnvironment('d');
+
+main() {
+  Expect.equals(a, false);
+  Expect.equals(b, false);
+  Expect.equals(c, null);
+  Expect.equals(d, null);
+}