---

yaml
---
r: 183925
b: refs/heads/master
c: b3c00a6
h: refs/heads/master
i:
  183923: ab4060b
v: v3

Author: nikomatsakis

[refs]

@@ -1,5 +1,5 @@
 ---
-refs/heads/master: c5579ca340b346f1b685887f7784c2e7f2090dcb
+refs/heads/master: b3c00a69f23b68cba2901eb98b3de7dfc6990396
 refs/heads/snap-stage1: e33de59e47c5076a89eadeb38f4934f58a3618a6
 refs/heads/snap-stage3: 522d09dfecbeca1595f25ac58c6d0178bbd21d7d
 refs/heads/try: ccf8fedf1cffcb8f6f3581d53d220039e192fe77

trunk/src/libcollections/btree/map.rs

@@ -512,13 +512,22 @@ mod stack {
     use super::super::node::handle;
     use vec::Vec;
 
+    struct InvariantLifetime<'id>(
+        marker::PhantomData<::core::cell::Cell<&'id ()>>);
+
+    impl<'id> InvariantLifetime<'id> {
+        fn new() -> InvariantLifetime<'id> {
+            InvariantLifetime(marker::PhantomData)
+        }
+    }
+
     /// A generic mutable reference, identical to `&mut` except for the fact that its lifetime
     /// parameter is invariant. This means that wherever an `IdRef` is expected, only an `IdRef`
     /// with the exact requested lifetime can be used. This is in contrast to normal references,
     /// where `&'static` can be used in any function expecting any lifetime reference.
     pub struct IdRef<'id, T: 'id> {
         inner: &'id mut T,
-        marker: marker::InvariantLifetime<'id>
+        _marker: InvariantLifetime<'id>,
     }
 
     impl<'id, T> Deref for IdRef<'id, T> {
@@ -560,7 +569,7 @@ mod stack {
     pub struct Pusher<'id, 'a, K:'a, V:'a> {
         map: &'a mut BTreeMap<K, V>,
         stack: Stack<K, V>,
-        marker: marker::InvariantLifetime<'id>
+        _marker: InvariantLifetime<'id>,
     }
 
     impl<'a, K, V> PartialSearchStack<'a, K, V> {
@@ -595,11 +604,11 @@ mod stack {
             let pusher = Pusher {
                 map: self.map,
                 stack: self.stack,
-                marker: marker::InvariantLifetime
+                _marker: InvariantLifetime::new(),
             };
             let node = IdRef {
                 inner: unsafe { &mut *self.next },
-                marker: marker::InvariantLifetime
+                _marker: InvariantLifetime::new(),
             };
 
             closure(pusher, node)