#![allow(dead_assignment)]
#![allow(unused_variable)]
+#![allow(unknown_features)]
+#![feature(box_syntax)]
-use std::gc::{Gc, GC};
-
-enum option<T> { some(Gc<T>), none, }
+enum option<T> { some(Box<T>), none, }
pub fn main() {
- let mut a: option<int> = some::<int>(box(GC) 10);
- a = none::<int>;
+ let mut a: option<int> = option::some::<int>(box 10);
+ a = option::none::<int>;
}