Fix warnings_checker.dart handling of multitests

tests/language_strong/const_constructor_super_test.dart

Index: tests/language_strong/const_constructor_super_test.dart
diff --git a/tests/language_strong/const_constructor_super_test.dart b/tests/language_strong/const_constructor_super_test.dart
index faf0418ba07884d758d045157393a15d580854c0..2b5adb30418aebe4a9eb155840129fa844074085 100644
--- a/tests/language_strong/const_constructor_super_test.dart
+++ b/tests/language_strong/const_constructor_super_test.dart
@@ -15,17 +15,17 @@ class B extends A {
   B(x) : b = x + 1, super(x);
 
   // Const constructor cannot call non-const super constructor.
-  const B.zerofive() : b = 0, super(5); // /// 01: compile-time error
+  const B.zerofive() : b = 0, super(5); // //# 01: compile-time error
 }
 
 class C extends A {
   C() : super(0);
   // Implicit call to non-const constructor A(x).
-  const C.named(x); // /// 02: compile-time error
+  const C.named(x); // //# 02: compile-time error
 }
 
 main() {
-  var b = new B.zerofive(); // /// 01: continued
+  var b = new B.zerofive(); // //# 01: continued
   var b1 = new B(0);
-  var c = new C.named(""); // /// 02: continued
+  var c = new C.named(""); // //# 02: continued
 }