---

yaml
---
r: 13738
b: refs/heads/master
c: 0c42a3f
h: refs/heads/master
v: v3

Author: eholk

[refs]

@@ -1,5 +1,5 @@
 ---
-refs/heads/master: 3297d465ca788fbb20a2430ced28420993deb8b7
+refs/heads/master: 0c42a3ffee8e5943cbe9783f924c467069c5e0c3
 refs/heads/snap-stage1: e33de59e47c5076a89eadeb38f4934f58a3618a6
 refs/heads/snap-stage3: 4a81779abd786ff22d71434c6d9a5917ea4cdfff
 refs/heads/try: 2898dcc5d97da9427ac367542382b6239d9c0bbf

trunk/src/libcore/vec.rs

@@ -484,10 +484,9 @@ fn push_all_move<T>(&v: [const T]/~, -rhs: [const T]/~) {
 
 // Appending
 #[inline(always)]
-pure fn append<T: copy>(lhs: [T]/&, rhs: [const T]/&) -> [T]/~ {
-    let mut v = []/~;
+pure fn append<T: copy>(+lhs: [T]/~, rhs: [const T]/&) -> [T]/~ {
+    let mut v <- lhs;
     unchecked {
-        push_all(v, lhs);
         push_all(v, rhs);
     }
     ret v;

trunk/src/test/bench/core-std.rs

@@ -22,6 +22,7 @@ fn main(argv: [str]/~) {
     #bench[shift_push];
     #bench[read_line];
     #bench[str_set];
+    #bench[vec_plus];
     #bench[vec_append];
     #bench[vec_push_all];
 }
@@ -75,18 +76,37 @@ fn str_set() {
     }
 }
 
-fn vec_append() {
+fn vec_plus() {
     let r = rand::rng();
 
-    let mut v = []/~;
-    for uint::range(0, 1500) {|i|
+    let mut v = []/~; 
+    let mut i = 0;
+    while i < 1500 {
         let rv = vec::from_elem(r.gen_uint_range(0, i + 1), i);
         if r.gen_bool() {
             v += rv;
         }
         else {
             v = rv + v;
         }
+        i += 1;
+    }
+}
+
+fn vec_append() {
+    let r = rand::rng();
+
+    let mut v = []/~;
+    let mut i = 0;
+    while i < 1500 {
+        let rv = vec::from_elem(r.gen_uint_range(0, i + 1), i);
+        if r.gen_bool() {
+            v = vec::append(v, rv);
+        }
+        else {
+            v = vec::append(rv, v);
+        }
+        i += 1;
     }
 }