public void ParseFunctionWithDelayedCall()
{
Parser parser = new Parser("f(X,Y) -> f(X-1, Y+1).");
var form = parser.ParseForm();
Assert.IsNotNull(form);
Assert.IsInstanceOfType(form, typeof(FunctionForm));
var fform = (FunctionForm)form;
Assert.IsInstanceOfType(fform.Body, typeof(DelayedCallExpression));
}