Generalize AST and ty::Generics to accept multiple lifetimes.

1 files changed, 12 insertions, 1 deletions

diff --git a/src/libstd/at_vec.rs b/src/libstd/at_vec.rs
index 7d10061e812..90729966c18 100644
--- a/src/libstd/at_vec.rs
+++ b/src/libstd/at_vec.rs
@@ -12,7 +12,7 @@
 
 use clone::Clone;
 use container::Container;
-use iter::Iterator;
+use iter::{Iterator, FromIterator};
 use option::{Option, Some, None};
 use mem;
 use unstable::raw::Repr;
@@ -134,6 +134,17 @@ impl<T> Clone for @[T] {
     }
 }
 
+impl<A> FromIterator<A> for @[A] {
+    fn from_iterator<T: Iterator<A>>(iterator: &mut T) -> @[A] {
+        let (lower, _) = iterator.size_hint();
+        do build(Some(lower)) |push| {
+            for x in *iterator {
+                push(x);
+            }
+        }
+    }
+}
+
 #[cfg(not(test))]
 #[allow(missing_doc)]
 pub mod traits {