Fix warnings_checker.dart handling of multitests

tests/corelib_strong/symbol_operator_test.dart

Index: tests/corelib_strong/symbol_operator_test.dart
diff --git a/tests/corelib_strong/symbol_operator_test.dart b/tests/corelib_strong/symbol_operator_test.dart
index e9b9e65ec3eab624d8961ffd648b6861a41fbcfc..753aec5c12713633a4b6cddda3599e5733e2f0aa 100644
--- a/tests/corelib_strong/symbol_operator_test.dart
+++ b/tests/corelib_strong/symbol_operator_test.dart
@@ -28,14 +28,14 @@ main() {
   testSymbol(#[]=, ($[$]=$).lastMember, "[]=");
   testSymbol(const Symbol("unary-"), -$, "unary-");
 
-  testSymbolThrows(">>>"); // /// 03: ok
-  testSymbolThrows("!"); //   /// 03: continued
-  testSymbolThrows("&&"); //  /// 03: continued
-  testSymbolThrows("||"); //  /// 03: continued
-  testSymbolThrows("?"); //   /// 03: continued
-  testSymbolThrows("?:"); //  /// 03: continued
-  testSymbolThrows("#"); //   /// 03: continued
-  testSymbolThrows("//"); //  /// 03: continued
+  testSymbolThrows(">>>"); // //# 03: ok
+  testSymbolThrows("!"); //   //# 03: continued
+  testSymbolThrows("&&"); //  //# 03: continued
+  testSymbolThrows("||"); //  //# 03: continued
+  testSymbolThrows("?"); //   //# 03: continued
+  testSymbolThrows("?:"); //  //# 03: continued
+  testSymbolThrows("#"); //   //# 03: continued
+  testSymbolThrows("//"); //  //# 03: continued
 }
 
 void testSymbol(Symbol constSymbol, var mirrorSymbol, String name) {