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diff --git a/vala/valatypecheck.vala b/vala/valatypecheck.vala
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+/* valatypecheck.vala
+ *
+ * Copyright (C) 2006  Jürg Billeter
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301  USA
+ *
+ * Author:
+ * 	Jürg Billeter <j@bitron.ch>
+ */
+
+using GLib;
+
+/**
+ * Represents a type check (`is') expression in the source code.
+ */
+public class Vala.TypeCheck : Expression {
+	/**
+	 * The expression to be checked.
+	 */
+	public Expression! expression { get; set construct; }
+	
+	/**
+	 * The type to be matched against.
+	 */
+	public TypeReference! type_reference { get; set construct; }
+
+	/**
+	 * Creates a new type check expression.
+	 *
+	 * @param expr   an expression
+	 * @param type   a data type
+	 * @param source reference to source code
+	 * @return       newly created type check expression
+	 */	
+	public TypeCheck (Expression! expr, TypeReference! type, SourceReference source) {
+		expression = expr;
+		type_reference = type;
+		source_reference = source;
+	}
+	
+	public override void accept (CodeVisitor! visitor) {
+		expression.accept (visitor);
+		
+		type_reference.accept (visitor);
+	
+		visitor.visit_type_check (this);
+	}
+}