JeffBelgum

#![feature(macro_rules)]

/// MIT license etc. etc.
///
/// Experimenting with Python-like list comprehensions.
///
/// An attempt to explore the possibility space for ergonomic improvements
/// in Rust that can come post v1.0. Notice that there are not type declerations. 
/// Aside from the "c!" macro invocation, Rust allows for an exact copy of the
/// Python comprehension syntax.

JeffBelgum

#[deriving(Clone, Eq)]
struct Node<T> {
  v: T,
  next: @mut Option<Node<T>>
}

#[deriving(Clone, Eq)]
struct List<T> {
  priv head: @mut Option<Node<T>>
}

JeffBelgum

#[deriving(ToStr, Clone, Eq)]
enum List<T> {
    Cons(T, @mut List<T>),
    Nil
}

/* 
 * from brson: it could be more efficient by avoiding that clone,
 * since the cost of cloning a T could be arbitrary.
 *