protected override Expression CreateExpressionTree (ResolveContext ec, TypeSpec delegate_type)
		{
			if (ec.IsInProbingMode)
				return this;

			BlockContext bc = new BlockContext (ec.MemberContext, ec.ConstructorBlock, ec.BuiltinTypes.Void) {
				CurrentAnonymousMethod = ec.CurrentAnonymousMethod
			};

			Expression args = Parameters.CreateExpressionTree (bc, loc);
			Expression expr = Block.CreateExpressionTree (ec);
			if (expr == null)
				return null;

			Arguments arguments = new Arguments (2);
			arguments.Add (new Argument (expr));
			arguments.Add (new Argument (args));
			return CreateExpressionFactoryCall (ec, "Lambda",
				new TypeArguments (new TypeExpression (delegate_type, loc)),
				arguments);
		}

		//
		// Creates mcs arguments from dynamic argument info
		//
		public Compiler.Arguments CreateCompilerArguments (IEnumerable<CSharpArgumentInfo> info, DynamicMetaObject[] args)
		{
			var res = new Compiler.Arguments (args.Length);
			int pos = 0;

			// enumerates over args
			foreach (var item in info) {
				var expr = CreateCompilerExpression (item, args[pos++]);
				if (item.IsNamed) {
					res.Add (new Compiler.NamedArgument (item.Name, Compiler.Location.Null, expr, item.ArgumentModifier));
				} else {
					res.Add (new Compiler.Argument (expr, item.ArgumentModifier));
				}

				if (pos == args.Length)
					break;
			}

			return res;
		}