Fix warnings_checker.dart handling of multitests

tests/language/bad_constructor_test.dart

Index: tests/language/bad_constructor_test.dart
diff --git a/tests/language/bad_constructor_test.dart b/tests/language/bad_constructor_test.dart
index dea3b369ea463b23ab5ff5b75ab438fa31195559..eee5a29996a4495391fb3e1c0c4526406937409e 100644
--- a/tests/language/bad_constructor_test.dart
+++ b/tests/language/bad_constructor_test.dart
@@ -4,20 +4,20 @@
 
 class A {
   // Constructor may not be static.
-  static A(); // /// 00: compile-time error
+  static A(); // //# 00: compile-time error
 
   // Factory may not be static.
-  static factory A() { return null; } // /// 01: compile-time error
+  static factory A() { return null; } // //# 01: compile-time error
 
   // Named constructor may not conflict with names of methods and fields.
   var m;
-  A.m() { m = 0; } // /// 04: compile-time error
+  A.m() { m = 0; } // //# 04: compile-time error
 
   set q(var value) { m = 0; }  // No name conflict with q=.
-  A.q(); //  /// 05: ok
-  A(); //    /// 05: ok
+  A.q(); //  //# 05: ok
+  A(); //    //# 05: ok
 
-  A.foo() : m = 0; // /// 06: compile-time error
+  A.foo() : m = 0; // //# 06: compile-time error
   int foo(int a, int b) => a + b * m;
 }