Implement argument definition test in the vm.

runtime/vm/ast_printer.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/ast_printer.h"
 
 #include "vm/handles.h"
 #include "vm/object.h"
 #include "vm/os.h"
 #include "vm/parser.h"
@@ skipping 30 matching lines @@
 void AstPrinter::VisitCloneContextNode(CloneContextNode* node) {
   VisitGenericAstNode(node);
 }
 
 
 void AstPrinter::VisitArgumentListNode(ArgumentListNode* arguments) {
   VisitGenericAstNode(arguments);
 }
 
 
+void AstPrinter::VisitArgumentDefinitionTestNode(
+    ArgumentDefinitionTestNode* node) {
+  OS::Print("(%s ?%s @%d)",
+            node->Name(),
+            node->formal_parameter_name().ToCString(),
+            node->formal_parameter_index());
+}
+
+
 void AstPrinter::VisitReturnNode(ReturnNode* node) {
   VisitGenericAstNode(node);
 }
 
 
 void AstPrinter::VisitGenericLocalNode(AstNode* node,
                                        const LocalVariable& var) {
   OS::Print("(%s %s%s '%s'",
             node->Name(),
             var.is_final() ? "final " : "",
@@ skipping 410 matching lines @@
   ASSERT(node_sequence != NULL);
   AstPrinter ast_printer;
   const char* function_name =
       parsed_function.function().ToFullyQualifiedCString();
   OS::Print("Ast for function '%s' {\n", function_name);
   node_sequence->Visit(&ast_printer);
   OS::Print("}\n");
 }
 
 }  // namespace dart