- Restore the better error message.

runtime/vm/parser.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/parser.h"
 
 #include "lib/invocation_mirror.h"
 #include "platform/utils.h"
 #include "vm/bootstrap.h"
 #include "vm/class_finalizer.h"
@@ skipping 5329 matching lines @@
   // Parse the function name out.
   const intptr_t native_pos = TokenPos();
   const String& native_name = ParseNativeDeclaration();
 
   // Now resolve the native function to the corresponding native entrypoint.
   const int num_params = NativeArguments::ParameterCountForResolution(func);
   bool auto_setup_scope = true;
   NativeFunction native_function = NativeEntry::ResolveNative(
       library, native_name, num_params, &auto_setup_scope);
   if (native_function == NULL) {
-    ErrorMsg(native_pos, "native function '%s' cannot be found",
-        native_name.ToCString());
+    ErrorMsg(native_pos,
+             "native function '%s' (%" Pd " arguments) cannot be found",
+             native_name.ToCString(), func.NumParameters());
   }
   func.SetIsNativeAutoSetupScope(auto_setup_scope);
 
   // Now add the NativeBodyNode and return statement.
   Dart_NativeEntryResolver resolver = library.native_entry_resolver();
   bool is_bootstrap_native = Bootstrap::IsBootstapResolver(resolver);
   current_block_->statements->Add(
       new ReturnNode(TokenPos(),
                      new NativeBodyNode(TokenPos(),
                                         Function::ZoneHandle(func.raw()),
@@ skipping 5413 matching lines @@
 void Parser::SkipQualIdent() {
   ASSERT(IsIdentifier());
   ConsumeToken();
   if (CurrentToken() == Token::kPERIOD) {
     ConsumeToken();  // Consume the kPERIOD token.
     ExpectIdentifier("identifier expected after '.'");
   }
 }
 
 }  // namespace dart