Migrated test block 29 to Dart 2.0

tests/corelib_2/symbol_test.dart

Index: tests/corelib_2/symbol_test.dart
diff --git a/tests/corelib_strong/symbol_test.dart b/tests/corelib_2/symbol_test.dart
similarity index 97%
rename from tests/corelib_strong/symbol_test.dart
rename to tests/corelib_2/symbol_test.dart
index 6b97092a670c334d7ac6787b3c07f269dccbb4d1..088443cbebdea93f6c868a508c18b022092c0bb5 100644
--- a/tests/corelib_strong/symbol_test.dart
+++ b/tests/corelib_2/symbol_test.dart
@@ -30,7 +30,7 @@ main() {
 
   try {
     var y = 0;
-    print(new Symbol(y));
+    print(new Symbol(y)); //# 04: compile-time error
     throw 'Expected a NoSuchMethodError or a TypeError';
   } on NoSuchMethodError {
     print('Caught NoSuchMethodError');