---

yaml
---
r: 20725
b: refs/heads/snap-stage3
c: 68e9aa5
h: refs/heads/master
i:
  20723: ea7776a
v: v3

Author: msullivan

[refs]

@@ -1,7 +1,7 @@
 ---
 refs/heads/master: e430a699f2c60890d9b86069fd0c68a70ece7120
 refs/heads/snap-stage1: e33de59e47c5076a89eadeb38f4934f58a3618a6
-refs/heads/snap-stage3: 519deca7168713a141e7341315a98b35e1f55ef2
+refs/heads/snap-stage3: 68e9aa5fcbfbb1b5e87c667372ac7212746779c0
 refs/heads/try: ffbe0e0e00374358b789b0037bcb3a577cd218be
 refs/tags/release-0.1: 1f5c5126e96c79d22cb7862f75304136e204f105
 refs/heads/ndm: f3868061cd7988080c30d6d5bf352a5a5fe2460b

branches/snap-stage3/src/libcore/at_vec.rs

@@ -131,25 +131,33 @@ mod unsafe {
         (**repr).fill = new_len * sys::size_of::<T>();
     }
 
-    /// Append an element to a vector
     #[inline(always)]
     unsafe fn push<T>(&v: @[const T], +initval: T) {
         let repr: **vec_repr = ::unsafe::reinterpret_cast(addr_of(v));
         let fill = (**repr).fill;
         if (**repr).alloc > fill {
-            (**repr).fill += sys::size_of::<T>();
-            let p = addr_of((**repr).data);
-            let p = ptr::offset(p, fill) as *mut T;
-            rusti::move_val_init(*p, initval);
+            push_fast(v, initval);
         }
         else {
             push_slow(v, initval);
         }
     }
+    // This doesn't bother to make sure we have space.
+    #[inline(always)] // really pretty please
+    unsafe fn push_fast<T>(&v: @[const T], +initval: T) {
+        let repr: **vec_repr = ::unsafe::reinterpret_cast(addr_of(v));
+        let fill = (**repr).fill;
+        (**repr).fill += sys::size_of::<T>();
+        let p = ptr::addr_of((**repr).data);
+        let p = ptr::offset(p, fill) as *mut T;
+        rusti::move_val_init(*p, initval);
+    }
+
     unsafe fn push_slow<T>(&v: @[const T], +initval: T) {
         reserve_at_least(v, v.len() + 1u);
-        push(v, initval);
+        push_fast(v, initval);
     }
+
     /**
      * Reserves capacity for exactly `n` elements in the given vector.
      *