auto merge of #5213 : erickt/rust/vec-ref, r=graydon

This patch series changes a handful of vec functions to return references instead of copies. The one downside with making this change is that these functions aren't usable in a couple cases now due to some purity complaints. For example, this [change](https://github.com/erickt/rust/commit/c31e81a532fc07e89be33cadb5109d167aa725f4#L1R87). I couldn't figure out a way to get `last` to work on a `@mut ~[...]` type, so I ended up having to use `*crate_cache[crate_cache.len() - 1].metas`.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/libstd/priority_queue.rs b/src/libstd/priority_queue.rs
index 4b92bd7543a..2a2c655cca9 100644
--- a/src/libstd/priority_queue.rs
+++ b/src/libstd/priority_queue.rs
@@ -197,7 +197,7 @@ mod tests {
         let mut sorted = merge_sort(data, le);
         let mut heap = from_vec(data);
         while !heap.is_empty() {
-            assert *heap.top() == sorted.last();
+            assert heap.top() == sorted.last();
             assert heap.pop() == sorted.pop();
         }
     }