- Fix string conversion warnings.

runtime/vm/bigint_operations_test.cc

 // Copyright (c) 2012, 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.
 
 #include "platform/assert.h"
 #include "vm/bigint_operations.h"
 #include "vm/object.h"
 #include "vm/object_store.h"
 #include "vm/unit_test.h"
 
@@ skipping 960 matching lines @@
 
 
 static void TestBigintRightShift(
     const char* a, int amount, const char* result) {
   const Bigint& bigint_a = Bigint::Handle(BigintOperations::NewFromCString(a));
   const Bigint& shifted =
       Bigint::Handle(BigintOperations::ShiftRight(bigint_a, amount));
   const char* str_shifted = BigintOperations::ToHexCString(shifted,
                                                            &ZoneAllocator);
   if (strcmp(result, str_shifted)) {
-    WARN2("%s >> %d", a, amount);
+    FAIL2("%s >> %d", a, amount);
   }
   EXPECT_STREQ(result, str_shifted);
 }
 
 
 TEST_CASE(BigintRightShift) {
   const char* zero = "0x0";
   const char* one = "0x1";
   const char* minus_one = "-0x1";
 
@@ skipping 1231 matching lines @@
       "123456789012345678901234567890123456789012345678901234567890123456789012"
       "345678901234567890123456789012345678901234567890123456789012345678901234"
       "567890123456789012345678901234567890123456789012345678901234567890123456"
       "789012345678901234567890123456789012345678901234567890123456789012345678"
       "90123456789012345678901234567890",
       "0x1234567890ABCDEF01234567890ABCDEF01234567890ABCDEF01234567890ABCDEF"
       "01234567890ABCDEE");
 }
 
 }  // namespace dart