[nem-en] Nemerle meets Linq

[Alejandro Serrano]

I've created some type of F#-like Linq integration in Nemerle as a set 
of macros, using the same |> extension.
However, I need some help with macros, firstly with orderby clauses, 
where I don't know where to start, because

orderby (_.Country), (_.Telephone) descending

must be converted into

|> System.Query.Sequence.ThenByDescending (_, _.Telephone)
|> System.Query.Sequence.OrderBy (_, _.Country)

Secondly, I don't know how to make:

def n = ["12/03/2004", "1/08/1998"];
def r = n
  |> orderby (fun (x) { x })
  |> select (System.DateTime.Parse(_));

to be parsed as:

def n = ["12/03/2004", "1/08/1998"];
def r = ( n
  |> orderby (fun (x) { x }) )
  |> select (System.DateTime.Parse(_));

instead of:

def n = ["12/03/2004", "1/08/1998"];
def r = n
  |> ( orderby (fun (x) { x })
  |> select (System.DateTime.Parse(_)) );

Finally I would like to know if there is a better way to say this:

def r = n |> orderby (fun (x) {x} );

to order something by itself, because _ alone gives error.

I attah by implementation plus a free Linq implementation.

Thanks in advance,
trupill
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