Macro linq::linq

macro_rules! linq {
    (from $v:ident; in $c:expr; select $ms:expr) => { ... };
    (from $v:ident; in $c:expr; $(where $mw:expr;)+ select $ms:expr) => { ... };
    (from $v:ident; in $c:expr; orderby $mo:expr; select $ms:expr) => { ... };
    (from $v:ident; in $c:expr; $(where $mw:expr;)+ orderby $mo:expr; select $ms:expr) => { ... };
}