Fix warnings_checker.dart handling of multitests

tests/language_strong/const_conditional_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 for conditionals as compile-time constants.
 
 import 'package:expect/expect.dart';
 
 class Marker {
   final field;
   const Marker(this.field);
 }
 
 var var0 = const Marker(0);
 var var1 = const Marker(1);
 const const0 = const Marker(0);
 const const1 = const Marker(1);
 
 const trueConst = true;
 const falseConst = false;
 var nonConst = true;
 const zeroConst = 0;
 
 const cond1 = trueConst ? const0 : const1;
-const cond1a = trueConst ? nonConst : const1; /// 01: compile-time error
-const cond1b = trueConst ? const0 : nonConst; /// 02: compile-time error
+const cond1a = trueConst ? nonConst : const1; //# 01: compile-time error
+const cond1b = trueConst ? const0 : nonConst; //# 02: compile-time error
 
 const cond2 = falseConst ? const0 : const1;
-const cond2a = falseConst ? nonConst : const1; /// 03: compile-time error
-const cond2b = falseConst ? const0 : nonConst; /// 04: compile-time error
+const cond2a = falseConst ? nonConst : const1; //# 03: compile-time error
+const cond2b = falseConst ? const0 : nonConst; //# 04: compile-time error
 
-const cond3 = nonConst ? const0 : const1; /// 05: compile-time error
-const cond3a = nonConst ? nonConst : const1; /// 06: compile-time error
-const cond3b = nonConst ? const0 : nonConst; /// 07: compile-time error
+const cond3 = nonConst ? const0 : const1; //# 05: compile-time error
+const cond3a = nonConst ? nonConst : const1; //# 06: compile-time error
+const cond3b = nonConst ? const0 : nonConst; //# 07: compile-time error
 
-const cond4 = zeroConst ? const0 : const1; /// 08: compile-time error
-const cond4a = zeroConst ? nonConst : const1; /// 09: compile-time error
-const cond4b = zeroConst ? const0 : nonConst; /// 10: compile-time error
+const cond4 = zeroConst ? const0 : const1; //# 08: compile-time error
+const cond4a = zeroConst ? nonConst : const1; //# 09: compile-time error
+const cond4b = zeroConst ? const0 : nonConst; //# 10: compile-time error
 
 void main() {
   Expect.identical(var0, cond1);
-  Expect.identical(nonConst, cond1a); /// 01: continued
-  Expect.identical(var0, cond1b); /// 02: continued
+  Expect.identical(nonConst, cond1a); //# 01: continued
+  Expect.identical(var0, cond1b); //# 02: continued
 
   Expect.identical(var1, cond2);
-  Expect.identical(var1, cond2a); /// 03: continued
-  Expect.identical(nonConst, cond2b); /// 04: continued
+  Expect.identical(var1, cond2a); //# 03: continued
+  Expect.identical(nonConst, cond2b); //# 04: continued
 
-  Expect.identical(var0, cond3); // /// 05: continued
-  Expect.identical(nonConst, cond3a); /// 06: continued
-  Expect.identical(var0, cond3b); /// 07: continued
+  Expect.identical(var0, cond3); // //# 05: continued
+  Expect.identical(nonConst, cond3a); //# 06: continued
+  Expect.identical(var0, cond3b); //# 07: continued
 
-  Expect.identical(var1, cond4); // /// 08: continued
-  Expect.identical(var1, cond4a); /// 09: continued
-  Expect.identical(nonConst, cond4b); /// 10: continued
+  Expect.identical(var1, cond4); // //# 08: continued
+  Expect.identical(var1, cond4a); //# 09: continued
+  Expect.identical(nonConst, cond4b); //# 10: continued
 }