---

yaml
---
r: 1773
b: refs/heads/master
c: e56a172
h: refs/heads/master
i:
  1771: 825d542
v: v3

Author: pcwalton

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 71de17d38ee8db40e5f50d2ce8986e9676767309
+refs/heads/master: e56a1720e4dd35f9143fc0620083b406c797fb9c

trunk/src/lib/_vec.rs

@@ -1,3 +1,6 @@
+import option.none;
+import option.some;
+
 import vbuf = rustrt.vbuf;
 
 type operator2[T,U,V] = fn(&T, &U) -> V;
@@ -115,6 +118,15 @@ fn print_debug_info[T](vec[mutable? T] v) {
     rustrt.vec_print_debug_info[T](v);
 }
 
+// Returns the last element of v.
+fn last[T](vec[mutable? T] v) -> option.t[T] {
+    auto l = len[T](v);
+    if (l == 0u) {
+        ret none[T];
+    }
+    ret some[T](v.(l - 1u));
+}
+
 // Returns elements from [start..end) from v.
 fn slice[T](vec[mutable? T] v, uint start, uint end) -> vec[T] {
     check (start <= end);