In FiftyThreeBitOverflow, stores overflowing value as a string.

runtime/vm/object.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 "vm/object.h"
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "vm/assembler.h"
 #include "vm/cpu.h"
@@ skipping 10617 matching lines @@
 const char* Integer::ToCString() const {
   // Integer is an interface. No instances of Integer should exist.
   UNREACHABLE();
   return "Integer";
 }
 
 
 // Throw FiftyThreeBitOverflow exception.
 static void ThrowFiftyThreeBitOverflow(const Integer& i) {
   const Array& exc_args = Array::Handle(Array::New(1));
-  exc_args.SetAt(0, i);
+  const String& i_str = String::Handle(String::New(i.ToCString()));
+  exc_args.SetAt(0, i_str);
   Exceptions::ThrowByType(Exceptions::kFiftyThreeBitOverflowError, exc_args);
 }
 
 
 RawInteger* Integer::New(const String& str, Heap::Space space) {
   // We are not supposed to have integers represented as two byte strings.
   ASSERT(str.IsOneByteString());
   int64_t value;
   if (!OS::StringToInt64(str.ToCString(), &value)) {
     const Bigint& big = Bigint::Handle(Bigint::New(str, space));
@@ skipping 2979 matching lines @@
                                     space);
   return reinterpret_cast<RawWeakProperty*>(raw);
 }
 
 
 const char* WeakProperty::ToCString() const {
   return "_WeakProperty";
 }
 
 }  // namespace dart