Fix warnings_checker.dart handling of multitests

tests/compiler/dart2js_extra/label_test.dart

Index: tests/compiler/dart2js_extra/label_test.dart
diff --git a/tests/compiler/dart2js_extra/label_test.dart b/tests/compiler/dart2js_extra/label_test.dart
index 6decfd6a547ff28048471b2f04dff31aa8627480..d31cb35844139abd9ebe40fdbfdb12ae62da2ea5 100644
--- a/tests/compiler/dart2js_extra/label_test.dart
+++ b/tests/compiler/dart2js_extra/label_test.dart
@@ -4,49 +4,49 @@
 
 // A break label must be declared where it's used.
 undeclaredBreakLabel1() {
-  foo: { break bar; break foo; } // /// 01: compile-time error
+  foo: { break bar; break foo; } // //# 01: compile-time error
 }
 
 undeclaredBreakLabel2() {
-  foo: while (true) { break bar; break foo; } // /// 02: compile-time error
+  foo: while (true) { break bar; break foo; } // //# 02: compile-time error
 }
 
 // An unlabeled break must be inside a loop or switch.
 noBreakTarget() {
-  foo: if (true) { break; break foo; } // /// 03: compile-time error
+  foo: if (true) { break; break foo; } // //# 03: compile-time error
 }
 
 // A continue label must be declared where it's used.
 undeclaredContinueLabel() {
-  foo: for (;;) { continue bar; break foo; } // /// 04: compile-time error
+  foo: for (;;) { continue bar; break foo; } // //# 04: compile-time error
 }
 
 // An unlabeled continue must be inside a loop.
 noContinueTarget() {
-  foo: if (true) continue; else break foo; // /// 05: compile-time error
+  foo: if (true) continue; else break foo; // //# 05: compile-time error
 }
 
 // A continue label must point to a continue-able statement.
 wrongContinueLabel() {
-  foo: if (true) continue foo; // /// 06: compile-time error
+  foo: if (true) continue foo; // //# 06: compile-time error
 }
 
 // Labels are not captured by closures.
 noncaptureLabel() {
-  foo: { //                   /// 07: compile-time error
-    (() { break foo; })(); // /// 07: continued
-    break foo; //             /// 07: continued
-  } //                        /// 07: continued
+  foo: { //                   //# 07: compile-time error
+    (() { break foo; })(); // //# 07: continued
+    break foo; //             //# 07: continued
+  } //                        //# 07: continued
 }
 
 // Implicit break targets are not captured by closures.
 noncaptureBreak() {
-  while(true) (() { break; })(); // /// 08: compile-time error
+  while(true) (() { break; })(); // //# 08: compile-time error
 }
 
 // Implicit continue targets are not captured by closures.
 noncaptureContinue() {
-  while(true) (() { continue; })(); // /// 09: compile-time error
+  while(true) (() { continue; })(); // //# 09: compile-time error
 }
 
 main() {