Improve repoorting of NoSuchMethod:

runtime/lib/object.cc

 // Copyright (c) 2011, 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/bootstrap_natives.h"
 
 #include "vm/exceptions.h"
 #include "vm/native_entry.h"
 #include "vm/object.h"
 
@@ skipping 22 matching lines @@
   // found.
   Class& instance_class = Class::Handle(instance.clazz());
   Function& function =
       Function::Handle(instance_class.LookupDynamicFunction(function_name));
   while (function.IsNull()) {
     instance_class = instance_class.SuperClass();
     if (instance_class.IsNull()) break;
     function = instance_class.LookupDynamicFunction(function_name);
   }
   if (!function.IsNull()) {
-    String& tmp = String::Handle();
-    String& extra_message = String::Handle();
-    tmp = String::NewSymbol("\nFound '");
-    extra_message = String::Concat(tmp, function_name);
-    tmp = String::NewSymbol("(");
-    extra_message = String::Concat(extra_message, tmp);
-    const int total_num_paramaters =
+    const int total_num_parameters =
         function.num_fixed_parameters() + function.num_optional_parameters();
-    // 0 is the receiver ('this'), skip it.
-    for (int i = 1; i < total_num_paramaters; i++) {
-      if (i > 1) {
-        tmp = String::NewSymbol(", ");
-        extra_message = String::Concat(extra_message, tmp);
-      }
-      tmp = function.ParameterNameAt(i);
-      extra_message = String::Concat(extra_message, tmp);
+    const Array& array = Array::Handle(Array::New(total_num_parameters - 1));
+    // Skip receiver.
+    for (int i = 1; i < total_num_parameters; i++) {
+      array.SetAt(i - 1, String::Handle(function.ParameterNameAt(i)));
     }
-    tmp = String::NewSymbol(")'");
-    extra_message = String::Concat(extra_message, tmp);
-    dart_arguments.Add(&extra_message);
+    dart_arguments.Add(&array);
   }
   Exceptions::ThrowByType(Exceptions::kNoSuchMethod, dart_arguments);
 }
 
 }  // namespace dart