---

yaml
---
r: 34659
b: refs/heads/master
c: 1ab914d
h: refs/heads/master
i:
  34657: 93ff8eb
  34655: 57e2c10
v: v3

Author: catamorphism

[refs]

@@ -1,5 +1,5 @@
 ---
-refs/heads/master: 5a8ba073bcd6ee6fd34ff545845a746cddc4904f
+refs/heads/master: 1ab914df1d24f6c198bb7b1e01a4cf0050d179c8
 refs/heads/snap-stage1: e33de59e47c5076a89eadeb38f4934f58a3618a6
 refs/heads/snap-stage3: eb8fd119c65c67f3b1b8268cc7341c22d39b7b61
 refs/heads/try: d324a424d8f84b1eb049b12cf34182bda91b0024

trunk/src/libcore/option.rs

@@ -119,11 +119,9 @@ pub pure fn chain<T, U>(opt: Option<T>,
      * function that returns an option.
      */
 
-    // XXX write with move match
-    if opt.is_some() {
-        f(unwrap(opt))
-    } else {
-        None
+    match move opt {
+        Some(move t) => f(t),
+        None => None
     }
 }
 

trunk/src/libcore/result.rs

@@ -105,11 +105,9 @@ pub pure fn to_either<T: Copy, U: Copy>(res: &Result<U, T>)
  */
 pub fn chain<T, U: Copy, V: Copy>(res: Result<T, V>, op: fn(t: T)
     -> Result<U, V>) -> Result<U, V> {
-    // XXX: Should be writable with move + match
-    if res.is_ok() {
-        op(unwrap(res))
-    } else {
-        Err(unwrap_err(res))
+    match move res {
+        Ok(move t) => op(t),
+        Err(move e) => Err(e)
     }
 }