2 files changed, 4 insertions, 2 deletions
diff --git a/src/libcollections/lib.rs b/src/libcollections/lib.rs
index da2c61b6fd3..6a65c991c95 100644
--- a/src/libcollections/lib.rs
+++ b/src/libcollections/lib.rs
@@ -24,6 +24,8 @@
        html_playground_url = "http://play.rust-lang.org/")]
 #![doc(test(no_crate_inject))]
 
+#![allow(trivial_casts)]
+#![allow(trivial_numeric_casts)]
 #![feature(alloc)]
 #![feature(box_syntax)]
 #![feature(box_patterns)]
diff --git a/src/libcollections/vec.rs b/src/libcollections/vec.rs
index 59819d01bc6..af2daabc2d0 100644
--- a/src/libcollections/vec.rs
+++ b/src/libcollections/vec.rs
@@ -1199,8 +1199,8 @@ impl<T: PartialEq> Vec<T> {
 
             // Avoid bounds checks by using unsafe pointers.
             let p = self.as_mut_ptr();
-            let mut r = 1;
-            let mut w = 1;
+            let mut r: usize = 1;
+            let mut w: usize = 1;
 
             while r < ln {
                 let p_r = p.offset(r as isize);