Update test.dart for detection output of machine formatted errors

tests/language/src/Prefix22NegativeTest.dart

Index: tests/language/src/Prefix22NegativeTest.dart
diff --git a/tests/language/src/Prefix22NegativeTest.dart b/tests/language/src/Prefix22NegativeTest.dart
index c056d5da2a778e5c9f606056588b85cff62c70c3..281d63f581628ed5faaedf108808f0e7fe92a491 100644
--- a/tests/language/src/Prefix22NegativeTest.dart
+++ b/tests/language/src/Prefix22NegativeTest.dart
@@ -4,13 +4,13 @@
 //
 // Unresolved symbols should be reported as an static type warnings.
 // In this variant of test we turn warnings into errors.
-// VMOptions=--fatal-type-errors --enable_type_errors
+// VMOptions= --enable_type_errors
 
 #library("Prefix21NegativeTest.dart");
 #import("library12.dart", prefix:"lib12");
 
 class myClass {
-  myClass(lib12.Library13 p) { // static type warning
+  myClass(lib12.Library13 p) { /// static type error
   }
 }