Rewrite negative const tests into a few multi tests.

tests/language/src/OptionalParameterSyntaxTest.dart

Index: tests/language/src/OptionalParameterSyntaxTest.dart
diff --git a/tests/language/src/OptionalParameterSyntaxTest.dart b/tests/language/src/OptionalParameterSyntaxTest.dart
new file mode 100644
index 0000000000000000000000000000000000000000..abc2934d45ac9e03cde80f5461deda76a9055c6d
--- /dev/null
+++ b/tests/language/src/OptionalParameterSyntaxTest.dart
@@ -0,0 +1,11 @@
+// Copyright (c) 2012, 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, testNonConstantDefaultValue());
+}
+
+testNonConstantDefaultValue(
+    [var parameter = main]  /// 01: compile-time error
+) => 42;