diff --git a/src/liballoc/arc.rs b/src/liballoc/arc.rs
index 24b4abbff4ae2..0617c604121f4 100644
--- a/src/liballoc/arc.rs
+++ b/src/liballoc/arc.rs
@@ -206,12 +206,12 @@ impl<T> Arc<T> {
 /// Get the number of weak references to this value.
 #[inline]
 #[unstable(feature = "alloc")]
-pub fn weak_count<T>(this: &Arc<T>) -> uint { this.inner().weak.load(SeqCst) - 1 }
+pub fn weak_count<T>(this: &Arc<T>) -> usize { this.inner().weak.load(SeqCst) - 1 }
 
 /// Get the number of strong references to this value.
 #[inline]
 #[unstable(feature = "alloc")]
-pub fn strong_count<T>(this: &Arc<T>) -> uint { this.inner().strong.load(SeqCst) }
+pub fn strong_count<T>(this: &Arc<T>) -> usize { this.inner().strong.load(SeqCst) }
 
 #[stable(feature = "rust1", since = "1.0.0")]
 impl<T> Clone for Arc<T> {
@@ -649,7 +649,7 @@ mod tests {
         let (tx, rx) = channel();
 
         let _t = Thread::spawn(move || {
-            let arc_v: Arc<Vec<int>> = rx.recv().unwrap();
+            let arc_v: Arc<Vec<i32>> = rx.recv().unwrap();
             assert_eq!((*arc_v)[3], 4);
         });
 
@@ -818,5 +818,5 @@ mod tests {
 
     // Make sure deriving works with Arc<T>
     #[derive(Eq, Ord, PartialEq, PartialOrd, Clone, Debug, Default)]
-    struct Foo { inner: Arc<int> }
+    struct Foo { inner: Arc<i32> }
 }
diff --git a/src/liballoc/boxed_test.rs b/src/liballoc/boxed_test.rs
index 8f65b8c42c928..b7bacaa0cae2b 100644
--- a/src/liballoc/boxed_test.rs
+++ b/src/liballoc/boxed_test.rs
@@ -22,7 +22,7 @@ use std::boxed::BoxAny;
 #[test]
 fn test_owned_clone() {
     let a = Box::new(5);
-    let b: Box<int> = a.clone();
+    let b: Box<i32> = a.clone();
     assert!(a == b);
 }
 
@@ -31,11 +31,11 @@ struct Test;
 
 #[test]
 fn any_move() {
-    let a = Box::new(8us) as Box<Any>;
+    let a = Box::new(8) as Box<Any>;
     let b = Box::new(Test) as Box<Any>;
 
-    match a.downcast::<uint>() {
-        Ok(a) => { assert!(a == Box::new(8us)); }
+    match a.downcast::<i32>() {
+        Ok(a) => { assert!(a == Box::new(8)); }
         Err(..) => panic!()
     }
     match b.downcast::<Test>() {
@@ -47,7 +47,7 @@ fn any_move() {
     let b = Box::new(Test) as Box<Any>;
 
     assert!(a.downcast::<Box<Test>>().is_err());
-    assert!(b.downcast::<Box<uint>>().is_err());
+    assert!(b.downcast::<Box<i32>>().is_err());
 }
 
 #[test]
diff --git a/src/liballoc/heap.rs b/src/liballoc/heap.rs
index 1d5637a6ad6b3..d3d86270d1e9f 100644
--- a/src/liballoc/heap.rs
+++ b/src/liballoc/heap.rs
@@ -21,7 +21,7 @@ use core::ptr::PtrExt;
 /// power of 2. The alignment must be no larger than the largest supported page
 /// size on the platform.
 #[inline]
-pub unsafe fn allocate(size: uint, align: uint) -> *mut u8 {
+pub unsafe fn allocate(size: usize, align: usize) -> *mut u8 {
     imp::allocate(size, align)
 }
 
@@ -37,7 +37,7 @@ pub unsafe fn allocate(size: uint, align: uint) -> *mut u8 {
 /// create the allocation referenced by `ptr`. The `old_size` parameter may be
 /// any value in range_inclusive(requested_size, usable_size).
 #[inline]
-pub unsafe fn reallocate(ptr: *mut u8, old_size: uint, size: uint, align: uint) -> *mut u8 {
+pub unsafe fn reallocate(ptr: *mut u8, old_size: usize, size: usize, align: usize) -> *mut u8 {
     imp::reallocate(ptr, old_size, size, align)
 }
 
@@ -54,7 +54,8 @@ pub unsafe fn reallocate(ptr: *mut u8, old_size: uint, size: uint, align: uint)
 /// create the allocation referenced by `ptr`. The `old_size` parameter may be
 /// any value in range_inclusive(requested_size, usable_size).
 #[inline]
-pub unsafe fn reallocate_inplace(ptr: *mut u8, old_size: uint, size: uint, align: uint) -> uint {
+pub unsafe fn reallocate_inplace(ptr: *mut u8, old_size: usize, size: usize,
+                                 align: usize) -> usize {
     imp::reallocate_inplace(ptr, old_size, size, align)
 }
 
@@ -66,14 +67,14 @@ pub unsafe fn reallocate_inplace(ptr: *mut u8, old_size: uint, size: uint, align
 /// create the allocation referenced by `ptr`. The `old_size` parameter may be
 /// any value in range_inclusive(requested_size, usable_size).
 #[inline]
-pub unsafe fn deallocate(ptr: *mut u8, old_size: uint, align: uint) {
+pub unsafe fn deallocate(ptr: *mut u8, old_size: usize, align: usize) {
     imp::deallocate(ptr, old_size, align)
 }
 
 /// Returns the usable size of an allocation created with the specified the
 /// `size` and `align`.
 #[inline]
-pub fn usable_size(size: uint, align: uint) -> uint {
+pub fn usable_size(size: usize, align: usize) -> usize {
     imp::usable_size(size, align)
 }
 
@@ -96,7 +97,7 @@ pub const EMPTY: *mut () = 0x1 as *mut ();
 #[cfg(not(test))]
 #[lang="exchange_malloc"]
 #[inline]
-unsafe fn exchange_malloc(size: uint, align: uint) -> *mut u8 {
+unsafe fn exchange_malloc(size: usize, align: usize) -> *mut u8 {
     if size == 0 {
         EMPTY as *mut u8
     } else {
@@ -109,7 +110,7 @@ unsafe fn exchange_malloc(size: uint, align: uint) -> *mut u8 {
 #[cfg(not(test))]
 #[lang="exchange_free"]
 #[inline]
-unsafe fn exchange_free(ptr: *mut u8, old_size: uint, align: uint) {
+unsafe fn exchange_free(ptr: *mut u8, old_size: usize, align: usize) {
     deallocate(ptr, old_size, align);
 }
 
@@ -122,49 +123,49 @@ unsafe fn exchange_free(ptr: *mut u8, old_size: uint, align: uint) {
               target_arch = "mips",
               target_arch = "mipsel",
               target_arch = "powerpc")))]
-const MIN_ALIGN: uint = 8;
+const MIN_ALIGN: usize = 8;
 #[cfg(all(not(feature = "external_funcs"),
           not(feature = "external_crate"),
           any(target_arch = "x86",
               target_arch = "x86_64",
               target_arch = "aarch64")))]
-const MIN_ALIGN: uint = 16;
+const MIN_ALIGN: usize = 16;
 
 #[cfg(feature = "external_funcs")]
 mod imp {
     extern {
-        fn rust_allocate(size: uint, align: uint) -> *mut u8;
-        fn rust_deallocate(ptr: *mut u8, old_size: uint, align: uint);
-        fn rust_reallocate(ptr: *mut u8, old_size: uint, size: uint, align: uint) -> *mut u8;
-        fn rust_reallocate_inplace(ptr: *mut u8, old_size: uint, size: uint,
-                                   align: uint) -> uint;
-        fn rust_usable_size(size: uint, align: uint) -> uint;
+        fn rust_allocate(size: usize, align: usize) -> *mut u8;
+        fn rust_deallocate(ptr: *mut u8, old_size: usize, align: usize);
+        fn rust_reallocate(ptr: *mut u8, old_size: usize, size: usize, align: usize) -> *mut u8;
+        fn rust_reallocate_inplace(ptr: *mut u8, old_size: usize, size: usize,
+                                   align: usize) -> usize;
+        fn rust_usable_size(size: usize, align: usize) -> usize;
         fn rust_stats_print();
     }
 
     #[inline]
-    pub unsafe fn allocate(size: uint, align: uint) -> *mut u8 {
+    pub unsafe fn allocate(size: usize, align: usize) -> *mut u8 {
         rust_allocate(size, align)
     }
 
     #[inline]
-    pub unsafe fn deallocate(ptr: *mut u8, old_size: uint, align: uint) {
+    pub unsafe fn deallocate(ptr: *mut u8, old_size: usize, align: usize) {
         rust_deallocate(ptr, old_size, align)
     }
 
     #[inline]
-    pub unsafe fn reallocate(ptr: *mut u8, old_size: uint, size: uint, align: uint) -> *mut u8 {
+    pub unsafe fn reallocate(ptr: *mut u8, old_size: usize, size: usize, align: usize) -> *mut u8 {
         rust_reallocate(ptr, old_size, size, align)
     }
 
     #[inline]
-    pub unsafe fn reallocate_inplace(ptr: *mut u8, old_size: uint, size: uint,
-                                     align: uint) -> uint {
+    pub unsafe fn reallocate_inplace(ptr: *mut u8, old_size: usize, size: usize,
+                                     align: usize) -> usize {
         rust_reallocate_inplace(ptr, old_size, size, align)
     }
 
     #[inline]
-    pub fn usable_size(size: uint, align: uint) -> uint {
+    pub fn usable_size(size: usize, align: usize) -> usize {
         unsafe { rust_usable_size(size, align) }
     }
 
@@ -215,42 +216,42 @@ mod imp {
 
     // MALLOCX_ALIGN(a) macro
     #[inline(always)]
-    fn mallocx_align(a: uint) -> c_int { a.trailing_zeros() as c_int }
+    fn mallocx_align(a: usize) -> c_int { a.trailing_zeros() as c_int }
 
     #[inline(always)]
-    fn align_to_flags(align: uint) -> c_int {
+    fn align_to_flags(align: usize) -> c_int {
         if align <= MIN_ALIGN { 0 } else { mallocx_align(align) }
     }
 
     #[inline]
-    pub unsafe fn allocate(size: uint, align: uint) -> *mut u8 {
+    pub unsafe fn allocate(size: usize, align: usize) -> *mut u8 {
         let flags = align_to_flags(align);
         je_mallocx(size as size_t, flags) as *mut u8
     }
 
     #[inline]
-    pub unsafe fn reallocate(ptr: *mut u8, _old_size: uint, size: uint, align: uint) -> *mut u8 {
+    pub unsafe fn reallocate(ptr: *mut u8, _old_size: usize, size: usize, align: usize) -> *mut u8 {
         let flags = align_to_flags(align);
         je_rallocx(ptr as *mut c_void, size as size_t, flags) as *mut u8
     }
 
     #[inline]
-    pub unsafe fn reallocate_inplace(ptr: *mut u8, _old_size: uint, size: uint,
-                                     align: uint) -> uint {
+    pub unsafe fn reallocate_inplace(ptr: *mut u8, _old_size: usize, size: usize,
+                                     align: usize) -> usize {
         let flags = align_to_flags(align);
-        je_xallocx(ptr as *mut c_void, size as size_t, 0, flags) as uint
+        je_xallocx(ptr as *mut c_void, size as size_t, 0, flags) as usize
     }
 
     #[inline]
-    pub unsafe fn deallocate(ptr: *mut u8, old_size: uint, align: uint) {
+    pub unsafe fn deallocate(ptr: *mut u8, old_size: usize, align: usize) {
         let flags = align_to_flags(align);
         je_sdallocx(ptr as *mut c_void, old_size as size_t, flags)
     }
 
     #[inline]
-    pub fn usable_size(size: uint, align: uint) -> uint {
+    pub fn usable_size(size: usize, align: usize) -> usize {
         let flags = align_to_flags(align);
-        unsafe { je_nallocx(size as size_t, flags) as uint }
+        unsafe { je_nallocx(size as size_t, flags) as usize }
     }
 
     pub fn stats_print() {
@@ -277,7 +278,7 @@ mod imp {
     }
 
     #[inline]
-    pub unsafe fn allocate(size: uint, align: uint) -> *mut u8 {
+    pub unsafe fn allocate(size: usize, align: usize) -> *mut u8 {
         if align <= MIN_ALIGN {
             libc::malloc(size as libc::size_t) as *mut u8
         } else {
@@ -294,7 +295,7 @@ mod imp {
     }
 
     #[inline]
-    pub unsafe fn reallocate(ptr: *mut u8, old_size: uint, size: uint, align: uint) -> *mut u8 {
+    pub unsafe fn reallocate(ptr: *mut u8, old_size: usize, size: usize, align: usize) -> *mut u8 {
         if align <= MIN_ALIGN {
             libc::realloc(ptr as *mut libc::c_void, size as libc::size_t) as *mut u8
         } else {
@@ -306,18 +307,18 @@ mod imp {
     }
 
     #[inline]
-    pub unsafe fn reallocate_inplace(_ptr: *mut u8, old_size: uint, _size: uint,
-                                     _align: uint) -> uint {
+    pub unsafe fn reallocate_inplace(_ptr: *mut u8, old_size: usize, _size: usize,
+                                     _align: usize) -> usize {
         old_size
     }
 
     #[inline]
-    pub unsafe fn deallocate(ptr: *mut u8, _old_size: uint, _align: uint) {
+    pub unsafe fn deallocate(ptr: *mut u8, _old_size: usize, _align: usize) {
         libc::free(ptr as *mut libc::c_void)
     }
 
     #[inline]
-    pub fn usable_size(size: uint, _align: uint) -> uint {
+    pub fn usable_size(size: usize, _align: usize) -> usize {
         size
     }
 
@@ -341,7 +342,7 @@ mod imp {
     }
 
     #[inline]
-    pub unsafe fn allocate(size: uint, align: uint) -> *mut u8 {
+    pub unsafe fn allocate(size: usize, align: usize) -> *mut u8 {
         if align <= MIN_ALIGN {
             libc::malloc(size as size_t) as *mut u8
         } else {
@@ -350,7 +351,7 @@ mod imp {
     }
 
     #[inline]
-    pub unsafe fn reallocate(ptr: *mut u8, _old_size: uint, size: uint, align: uint) -> *mut u8 {
+    pub unsafe fn reallocate(ptr: *mut u8, _old_size: usize, size: usize, align: usize) -> *mut u8 {
         if align <= MIN_ALIGN {
             libc::realloc(ptr as *mut c_void, size as size_t) as *mut u8
         } else {
@@ -359,13 +360,13 @@ mod imp {
     }
 
     #[inline]
-    pub unsafe fn reallocate_inplace(_ptr: *mut u8, old_size: uint, _size: uint,
-                                     _align: uint) -> uint {
+    pub unsafe fn reallocate_inplace(_ptr: *mut u8, old_size: usize, _size: usize,
+                                     _align: usize) -> usize {
         old_size
     }
 
     #[inline]
-    pub unsafe fn deallocate(ptr: *mut u8, _old_size: uint, align: uint) {
+    pub unsafe fn deallocate(ptr: *mut u8, _old_size: usize, align: usize) {
         if align <= MIN_ALIGN {
             libc::free(ptr as *mut libc::c_void)
         } else {
@@ -374,7 +375,7 @@ mod imp {
     }
 
     #[inline]
-    pub fn usable_size(size: uint, _align: uint) -> uint {
+    pub fn usable_size(size: usize, _align: usize) -> usize {
         size
     }
 
diff --git a/src/liballoc/lib.rs b/src/liballoc/lib.rs
index 81391fd63eb85..0e6266f9cbc57 100644
--- a/src/liballoc/lib.rs
+++ b/src/liballoc/lib.rs
@@ -70,7 +70,6 @@
 #![feature(lang_items, unsafe_destructor)]
 #![feature(box_syntax)]
 #![feature(optin_builtin_traits)]
-#![feature(int_uint)]
 #![feature(unboxed_closures)]
 #![feature(core)]
 #![feature(hash)]
diff --git a/src/liballoc/rc.rs b/src/liballoc/rc.rs
index 54ff4c1865472..ab3c0901bc956 100644
--- a/src/liballoc/rc.rs
+++ b/src/liballoc/rc.rs
@@ -40,7 +40,7 @@
 //! }
 //!
 //! struct Gadget {
-//!     id: int,
+//!     id: i32,
 //!     owner: Rc<Owner>
 //!     // ...other fields
 //! }
@@ -99,7 +99,7 @@
 //! }
 //!
 //! struct Gadget {
-//!     id: int,
+//!     id: i32,
 //!     owner: Rc<Owner>
 //!     // ...other fields
 //! }
@@ -166,8 +166,8 @@ use heap::deallocate;
 
 struct RcBox<T> {
     value: T,
-    strong: Cell<uint>,
-    weak: Cell<uint>
+    strong: Cell<usize>,
+    weak: Cell<usize>
 }
 
 /// An immutable reference-counted pointer type.
@@ -233,12 +233,12 @@ impl<T> Rc<T> {
 /// Get the number of weak references to this value.
 #[inline]
 #[unstable(feature = "alloc")]
-pub fn weak_count<T>(this: &Rc<T>) -> uint { this.weak() - 1 }
+pub fn weak_count<T>(this: &Rc<T>) -> usize { this.weak() - 1 }
 
 /// Get the number of strong references to this value.
 #[inline]
 #[unstable(feature = "alloc")]
-pub fn strong_count<T>(this: &Rc<T>) -> uint { this.strong() }
+pub fn strong_count<T>(this: &Rc<T>) -> usize { this.strong() }
 
 /// Returns true if there are no other `Rc` or `Weak<T>` values that share the same inner value.
 ///
@@ -447,7 +447,7 @@ impl<T: Default> Default for Rc<T> {
     /// use std::rc::Rc;
     /// use std::default::Default;
     ///
-    /// let x: Rc<int> = Default::default();
+    /// let x: Rc<i32> = Default::default();
     /// ```
     #[inline]
     #[stable(feature = "rust1", since = "1.0.0")]
@@ -750,7 +750,7 @@ trait RcBoxPtr<T> {
     fn inner(&self) -> &RcBox<T>;
 
     #[inline]
-    fn strong(&self) -> uint { self.inner().strong.get() }
+    fn strong(&self) -> usize { self.inner().strong.get() }
 
     #[inline]
     fn inc_strong(&self) { self.inner().strong.set(self.strong() + 1); }
@@ -759,7 +759,7 @@ trait RcBoxPtr<T> {
     fn dec_strong(&self) { self.inner().strong.set(self.strong() - 1); }
 
     #[inline]
-    fn weak(&self) -> uint { self.inner().weak.get() }
+    fn weak(&self) -> usize { self.inner().weak.get() }
 
     #[inline]
     fn inc_weak(&self) { self.inner().weak.set(self.weak() + 1); }
diff --git a/src/libarena/lib.rs b/src/libarena/lib.rs
index 62d103ae06a88..223c5111f8f4e 100644
--- a/src/libarena/lib.rs
+++ b/src/libarena/lib.rs
@@ -31,7 +31,6 @@
 #![feature(alloc)]
 #![feature(box_syntax)]
 #![feature(core)]
-#![feature(int_uint)]
 #![feature(staged_api)]
 #![feature(unboxed_closures)]
 #![feature(unsafe_destructor)]
@@ -55,12 +54,12 @@ use std::rt::heap::{allocate, deallocate};
 #[derive(Clone, PartialEq)]
 struct Chunk {
     data: Rc<RefCell<Vec<u8>>>,
-    fill: Cell<uint>,
+    fill: Cell<usize>,
     is_copy: Cell<bool>,
 }
 
 impl Chunk {
-    fn capacity(&self) -> uint {
+    fn capacity(&self) -> usize {
         self.data.borrow().capacity()
     }
 
@@ -105,7 +104,7 @@ impl Arena {
     }
 
     /// Allocates a new Arena with `initial_size` bytes preallocated.
-    pub fn new_with_size(initial_size: uint) -> Arena {
+    pub fn new_with_size(initial_size: usize) -> Arena {
         Arena {
             head: RefCell::new(chunk(initial_size, false)),
             copy_head: RefCell::new(chunk(initial_size, true)),
@@ -114,7 +113,7 @@ impl Arena {
     }
 }
 
-fn chunk(size: uint, is_copy: bool) -> Chunk {
+fn chunk(size: usize, is_copy: bool) -> Chunk {
     Chunk {
         data: Rc::new(RefCell::new(Vec::with_capacity(size))),
         fill: Cell::new(0),
@@ -137,7 +136,7 @@ impl Drop for Arena {
 }
 
 #[inline]
-fn round_up(base: uint, align: uint) -> uint {
+fn round_up(base: usize, align: usize) -> usize {
     (base.checked_add(align - 1)).unwrap() & !(align - 1)
 }
 
@@ -149,7 +148,7 @@ unsafe fn destroy_chunk(chunk: &Chunk) {
     let fill = chunk.fill.get();
 
     while idx < fill {
-        let tydesc_data: *const uint = mem::transmute(buf.offset(idx as int));
+        let tydesc_data: *const usize = mem::transmute(buf.offset(idx as isize));
         let (tydesc, is_done) = un_bitpack_tydesc_ptr(*tydesc_data);
         let (size, align) = ((*tydesc).size, (*tydesc).align);
 
@@ -160,7 +159,7 @@ unsafe fn destroy_chunk(chunk: &Chunk) {
         //debug!("freeing object: idx = {}, size = {}, align = {}, done = {}",
         //       start, size, align, is_done);
         if is_done {
-            ((*tydesc).drop_glue)(buf.offset(start as int) as *const i8);
+            ((*tydesc).drop_glue)(buf.offset(start as isize) as *const i8);
         }
 
         // Find where the next tydesc lives
@@ -173,21 +172,21 @@ unsafe fn destroy_chunk(chunk: &Chunk) {
 // is necessary in order to properly do cleanup if a panic occurs
 // during an initializer.
 #[inline]
-fn bitpack_tydesc_ptr(p: *const TyDesc, is_done: bool) -> uint {
-    p as uint | (is_done as uint)
+fn bitpack_tydesc_ptr(p: *const TyDesc, is_done: bool) -> usize {
+    p as usize | (is_done as usize)
 }
 #[inline]
-fn un_bitpack_tydesc_ptr(p: uint) -> (*const TyDesc, bool) {
+fn un_bitpack_tydesc_ptr(p: usize) -> (*const TyDesc, bool) {
     ((p & !1) as *const TyDesc, p & 1 == 1)
 }
 
 impl Arena {
-    fn chunk_size(&self) -> uint {
+    fn chunk_size(&self) -> usize {
         self.copy_head.borrow().capacity()
     }
 
     // Functions for the POD part of the arena
-    fn alloc_copy_grow(&self, n_bytes: uint, align: uint) -> *const u8 {
+    fn alloc_copy_grow(&self, n_bytes: usize, align: usize) -> *const u8 {
         // Allocate a new chunk.
         let new_min_chunk_size = cmp::max(n_bytes, self.chunk_size());
         self.chunks.borrow_mut().push(self.copy_head.borrow().clone());
@@ -199,7 +198,7 @@ impl Arena {
     }
 
     #[inline]
-    fn alloc_copy_inner(&self, n_bytes: uint, align: uint) -> *const u8 {
+    fn alloc_copy_inner(&self, n_bytes: usize, align: usize) -> *const u8 {
         let start = round_up(self.copy_head.borrow().fill.get(), align);
 
         let end = start + n_bytes;
@@ -211,7 +210,7 @@ impl Arena {
         copy_head.fill.set(end);
 
         unsafe {
-            copy_head.as_ptr().offset(start as int)
+            copy_head.as_ptr().offset(start as isize)
         }
     }
 
@@ -227,8 +226,8 @@ impl Arena {
     }
 
     // Functions for the non-POD part of the arena
-    fn alloc_noncopy_grow(&self, n_bytes: uint,
-                          align: uint) -> (*const u8, *const u8) {
+    fn alloc_noncopy_grow(&self, n_bytes: usize,
+                          align: usize) -> (*const u8, *const u8) {
         // Allocate a new chunk.
         let new_min_chunk_size = cmp::max(n_bytes, self.chunk_size());
         self.chunks.borrow_mut().push(self.head.borrow().clone());
@@ -240,8 +239,8 @@ impl Arena {
     }
 
     #[inline]
-    fn alloc_noncopy_inner(&self, n_bytes: uint,
-                           align: uint) -> (*const u8, *const u8) {
+    fn alloc_noncopy_inner(&self, n_bytes: usize,
+                           align: usize) -> (*const u8, *const u8) {
         // Be careful to not maintain any `head` borrows active, because
         // `alloc_noncopy_grow` borrows it mutably.
         let (start, end, tydesc_start, head_capacity) = {
@@ -265,7 +264,7 @@ impl Arena {
 
         unsafe {
             let buf = head.as_ptr();
-            return (buf.offset(tydesc_start as int), buf.offset(start as int));
+            return (buf.offset(tydesc_start as isize), buf.offset(start as isize));
         }
     }
 
@@ -276,7 +275,7 @@ impl Arena {
             let (ty_ptr, ptr) =
                 self.alloc_noncopy_inner(mem::size_of::<T>(),
                                          mem::min_align_of::<T>());
-            let ty_ptr = ty_ptr as *mut uint;
+            let ty_ptr = ty_ptr as *mut usize;
             let ptr = ptr as *mut T;
             // Write in our tydesc along with a bit indicating that it
             // has *not* been initialized yet.
@@ -320,7 +319,7 @@ fn test_arena_destructors() {
 
 #[test]
 fn test_arena_alloc_nested() {
-    struct Inner { value: uint }
+    struct Inner { value: usize }
     struct Outer<'a> { inner: &'a Inner }
 
     let arena = Arena::new();
@@ -343,10 +342,10 @@ fn test_arena_destructors_fail() {
         arena.alloc(|| { Rc::new(i) });
         // Allocate something with funny size and alignment, to keep
         // things interesting.
-        arena.alloc(|| { [0u8, 1u8, 2u8] });
+        arena.alloc(|| { [0u8, 1, 2] });
     }
     // Now, panic while allocating
-    arena.alloc::<Rc<int>, _>(|| {
+    arena.alloc::<Rc<i32>, _>(|| {
         panic!();
     });
 }
@@ -373,12 +372,12 @@ struct TypedArenaChunk<T> {
     next: *mut TypedArenaChunk<T>,
 
     /// The number of elements that this chunk can hold.
-    capacity: uint,
+    capacity: usize,
 
     // Objects follow here, suitably aligned.
 }
 
-fn calculate_size<T>(capacity: uint) -> uint {
+fn calculate_size<T>(capacity: usize) -> usize {
     let mut size = mem::size_of::<TypedArenaChunk<T>>();
     size = round_up(size, mem::min_align_of::<T>());
     let elem_size = mem::size_of::<T>();
@@ -389,7 +388,7 @@ fn calculate_size<T>(capacity: uint) -> uint {
 
 impl<T> TypedArenaChunk<T> {
     #[inline]
-    unsafe fn new(next: *mut TypedArenaChunk<T>, capacity: uint)
+    unsafe fn new(next: *mut TypedArenaChunk<T>, capacity: usize)
            -> *mut TypedArenaChunk<T> {
         let size = calculate_size::<T>(capacity);
         let chunk = allocate(size, mem::min_align_of::<TypedArenaChunk<T>>())
@@ -403,13 +402,13 @@ impl<T> TypedArenaChunk<T> {
     /// Destroys this arena chunk. If the type descriptor is supplied, the
     /// drop glue is called; otherwise, drop glue is not called.
     #[inline]
-    unsafe fn destroy(&mut self, len: uint) {
+    unsafe fn destroy(&mut self, len: usize) {
         // Destroy all the allocated objects.
         if intrinsics::needs_drop::<T>() {
             let mut start = self.start();
             for _ in 0..len {
                 ptr::read(start as *const T); // run the destructor on the pointer
-                start = start.offset(mem::size_of::<T>() as int)
+                start = start.offset(mem::size_of::<T>() as isize)
             }
         }
 
@@ -429,7 +428,7 @@ impl<T> TypedArenaChunk<T> {
     fn start(&self) -> *const u8 {
         let this: *const TypedArenaChunk<T> = self;
         unsafe {
-            mem::transmute(round_up(this.offset(1) as uint,
+            mem::transmute(round_up(this.offset(1) as usize,
                                     mem::min_align_of::<T>()))
         }
     }
@@ -439,7 +438,7 @@ impl<T> TypedArenaChunk<T> {
     fn end(&self) -> *const u8 {
         unsafe {
             let size = mem::size_of::<T>().checked_mul(self.capacity).unwrap();
-            self.start().offset(size as int)
+            self.start().offset(size as isize)
         }
     }
 }
@@ -454,7 +453,7 @@ impl<T> TypedArena<T> {
     /// Creates a new `TypedArena` with preallocated space for the given number of
     /// objects.
     #[inline]
-    pub fn with_capacity(capacity: uint) -> TypedArena<T> {
+    pub fn with_capacity(capacity: usize) -> TypedArena<T> {
         unsafe {
             let chunk = TypedArenaChunk::<T>::new(ptr::null_mut(), capacity);
             TypedArena {
@@ -501,8 +500,8 @@ impl<T> Drop for TypedArena<T> {
     fn drop(&mut self) {
         unsafe {
             // Determine how much was filled.
-            let start = self.first.borrow().as_ref().unwrap().start() as uint;
-            let end = self.ptr.get() as uint;
+            let start = self.first.borrow().as_ref().unwrap().start() as usize;
+            let end = self.ptr.get() as usize;
             let diff = (end - start) / mem::size_of::<T>();
 
             // Pass that to the `destroy` method.
@@ -519,9 +518,9 @@ mod tests {
 
     #[allow(dead_code)]
     struct Point {
-        x: int,
-        y: int,
-        z: int,
+        x: i32,
+        y: i32,
+        z: i32,
     }
 
     #[test]
@@ -576,7 +575,7 @@ mod tests {
     #[allow(dead_code)]
     struct Noncopy {
         string: String,
-        array: Vec<int>,
+        array: Vec<i32>,
     }
 
     #[test]
diff --git a/src/liblibc/lib.rs b/src/liblibc/lib.rs
index 38d5c5eb27ae2..d95d0863ca81f 100644
--- a/src/liblibc/lib.rs
+++ b/src/liblibc/lib.rs
@@ -15,7 +15,6 @@
 #![cfg_attr(not(feature = "cargo-build"), feature(staged_api))]
 #![cfg_attr(not(feature = "cargo-build"), staged_api)]
 #![cfg_attr(not(feature = "cargo-build"), feature(core))]
-#![feature(int_uint)]
 #![feature(no_std)]
 #![no_std]
 #![doc(html_logo_url = "http://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png",
@@ -1905,7 +1904,7 @@ pub mod types {
                 #[repr(C)]
                 #[derive(Copy)] pub struct WSAPROTOCOLCHAIN {
                     pub ChainLen: c_int,
-                    pub ChainEntries: [DWORD; MAX_PROTOCOL_CHAIN as uint],
+                    pub ChainEntries: [DWORD; MAX_PROTOCOL_CHAIN as usize],
                 }
 
                 pub type LPWSAPROTOCOLCHAIN = *mut WSAPROTOCOLCHAIN;
@@ -1931,7 +1930,7 @@ pub mod types {
                     pub iSecurityScheme: c_int,
                     pub dwMessageSize: DWORD,
                     pub dwProviderReserved: DWORD,
-                    pub szProtocol: [u8; (WSAPROTOCOL_LEN as uint) + 1us],
+                    pub szProtocol: [u8; WSAPROTOCOL_LEN as usize + 1],
                 }
 
                 pub type LPWSAPROTOCOL_INFO = *mut WSAPROTOCOL_INFO;