Fix warnings_checker.dart handling of multitests

tests/corelib_strong/symbol_operator_test.dart

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 // Test of Symbol class for operators..
 
 var $ = new Symbolize();
 
 main() {
   testSymbol(#+, $+$, "+");
@@ skipping 10 matching lines @@
   testSymbol(#^, $^$, "^");
   testSymbol(#<, $<$, "<");
   testSymbol(#<=, $<=$, "<=");
   testSymbol(#>, $>$, ">");
   testSymbol(#>=, $>=$, ">=");
   testSymbol(#==, new Symbol("=="), "==");  // Can't hit noSuchMethod.
   testSymbol(#[], $[$], "[]");
   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) {
   Symbol dynamicSymbol = new Symbol(name);
   if (constSymbol != mirrorSymbol) {
     throw "Not equal #$name, \$$name: $constSymbol, $mirrorSymbol";
   }
   if (constSymbol != dynamicSymbol) {
     throw "Not equal #$name, new Symbol('$name'): $constSymbol, $dynamicSymbol";
   }
@@ skipping 23 matching lines @@
   }
   if (!fails) {
     throw "Didn't throw: $name";
   }
 }
 
 class Symbolize {
   Symbol lastMember;
   noSuchMethod(m) => lastMember = m.memberName;
 }