Migrate test block 8 to Dart 2.0.

tests/corelib_2/from_environment_const_type_test.dart

Index: tests/corelib_2/from_environment_const_type_test.dart
diff --git a/tests/corelib_2/from_environment_const_type_test.dart b/tests/corelib_2/from_environment_const_type_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..3ed691cd868bbac3dd0a37ce3abf0842ab9420ec
--- /dev/null
+++ b/tests/corelib_2/from_environment_const_type_test.dart
@@ -0,0 +1,43 @@
+// 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.
+// SharedOptions=-Da=true -Db=false -Dc=3 -Dd=STRING
+
+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, true);
+  Expect.equals(b, false);
+  Expect.equals(c, 3);
+  Expect.equals(d, 'STRING');
+}