Rewrite negative const tests into a few multi tests.

tests/language/src/ConstSyntaxTest.dart

Index: tests/language/src/ConstSyntaxTest.dart
diff --git a/tests/language/src/ConstSyntaxTest.dart b/tests/language/src/ConstSyntaxTest.dart
new file mode 100644
index 0000000000000000000000000000000000000000..f80777394344c318e438930ce5876a12774433e6
--- /dev/null
+++ b/tests/language/src/ConstSyntaxTest.dart
@@ -0,0 +1,18 @@
+// Copyright (c) 2011, 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.
+
+main() {
+  Expect.equals(42, FOO);   /// 01: compile-time error
+  Expect.equals(87, BAR);   /// 02: compile-time error
+  Expect.equals(42, C.FOO); /// 03: compile-time error
+  Expect.equals(87, C.FOO); /// 04: compile-time error
+}
+
+const FOO = 42;     /// 01: continued
+const int BAR = 87; /// 02: continued
+
+class C {
+  static const FOO = 42;     /// 03: continued
+  static const int BAR = 87; /// 04: continued
+}