std: make .swap_remove return Option<T>.

This is one of the last raw "indexing" method on vectors that returns
`T` instead of the Option.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/libgreen/stack.rs b/src/libgreen/stack.rs
index 8a5e6be17c8..053d73c010e 100644
--- a/src/libgreen/stack.rs
+++ b/src/libgreen/stack.rs
@@ -139,7 +139,7 @@ impl StackPool {
     pub fn take_stack(&mut self, min_size: uint) -> Stack {
         // Ideally this would be a binary search
         match self.stacks.iter().position(|s| min_size <= s.min_size) {
-            Some(idx) => self.stacks.swap_remove(idx),
+            Some(idx) => self.stacks.swap_remove(idx).unwrap(),
             None => Stack::new(min_size)
         }
     }