Hakeashar

    // Something like Scala's 'Predef'
    public static class Id<T>
    {
	public static Func<T, T> Identity { get {  return x => x; } }
    }

   using Id;

   var grouped = list.GroupBy(Identity);

    type Person = { FirstName : string; LastName : string }
    let single = { FirstName = "Jane"; LastName = "Doe" }
    let married = { single with LastName = "Smith" }