A MessageObject is a purely internal object to hold information about

test/cctest/test-api.cc

 // Copyright 2007-2009 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 2367 matching lines @@
 
 // Test that overwritten methods are not invoked on uncaught exception
 // formatting. However, they are invoked when performing normal error
 // string conversions.
 TEST(APIThrowMessageOverwrittenToString) {
   v8::HandleScope scope;
   v8::V8::AddMessageListener(check_reference_error_message);
   Local<ObjectTemplate> templ = ObjectTemplate::New();
   templ->Set(v8_str("fail"), v8::FunctionTemplate::New(Fail));
   LocalContext context(NULL, templ);
+  CompileRun("asdf;");
+  CompileRun("var limit = {};"
+             "limit.valueOf = fail;"
+             "Error.stackTraceLimit = limit;");
+  CompileRun("asdf");
   CompileRun("Array.prototype.pop = fail;");
   CompileRun("Object.prototype.hasOwnProperty = fail;");
   CompileRun("Object.prototype.toString = function f() { return 'Yikes'; }");
   CompileRun("Number.prototype.toString = function f() { return 'Yikes'; }");
   CompileRun("String.prototype.toString = function f() { return 'Yikes'; }");
   CompileRun("ReferenceError.prototype.toString ="
              "  function() { return 'Whoops' }");
   CompileRun("asdf;");
   CompileRun("ReferenceError.prototype.constructor.name = void 0;");
   CompileRun("asdf;");
@@ skipping 9834 matching lines @@
   v8::Context::Scope context_scope(context.local());
 
   v8::Handle<v8::ObjectTemplate> tmpl = v8::ObjectTemplate::New();
   tmpl->SetNamedPropertyHandler(Getter, NULL, NULL, NULL, Enumerator);
   context->Global()->Set(v8_str("o"), tmpl->NewInstance());
   v8::Handle<v8::Array> result = v8::Handle<v8::Array>::Cast(CompileRun(
         "var result = []; for (var k in o) result.push(k); result"));
   CHECK_EQ(1, result->Length());
   CHECK_EQ(v8_str("universalAnswer"), result->Get(0));
 }