Auto merge of #27871 - alexcrichton:stabilize-libcore, r=aturon

These commits move libcore into a state so that it's ready for stabilization, performing some minor cleanup:

* The primitive modules for integers in the standard library were all removed from the source tree as they were just straight reexports of the libcore variants.
* The `core::atomic` module now lives in `core::sync::atomic`. The `core::sync` module is otherwise empty, but ripe for expansion!
* The `core::prelude::v1` module was stabilized after auditing that it is a subset of the standard library's prelude plus some primitive extension traits (char, str, and slice)
* Some unstable-hacks for float parsing errors were shifted around to not use the same unstable hacks (e.g. the `flt2dec` module is now used for "privacy").


After this commit, the remaining large unstable functionality specific to libcore is:

* `raw`, `intrinsics`, `nonzero`, `array`, `panicking`, `simd` -- these modules are all unstable or not reexported in the standard library, so they're just remaining in the same status quo as before
* `num::Float` - this extension trait for floats needs to be audited for functionality (much of that is happening in #27823)  and may also want to be renamed to `FloatExt` or `F32Ext`/`F64Ext`.
* Should the extension traits for primitives be stabilized in libcore?

I believe other unstable pieces are not isolated to just libcore but also affect the standard library.

cc #27701

40 files changed, 244 insertions, 461 deletions

diff --git a/src/liballoc/arc.rs b/src/liballoc/arc.rs
index aa71b7b132a..bb2daa2a1d7 100644
--- a/src/liballoc/arc.rs
+++ b/src/liballoc/arc.rs
@@ -71,8 +71,8 @@
 
 use boxed::Box;
 
-use core::atomic;
-use core::atomic::Ordering::{Relaxed, Release, Acquire, SeqCst};
+use core::sync::atomic;
+use core::sync::atomic::Ordering::{Relaxed, Release, Acquire, SeqCst};
 use core::fmt;
 use core::cmp::Ordering;
 use core::mem::{align_of_val, size_of_val};
diff --git a/src/libcore/lib.rs b/src/libcore/lib.rs
index f05ef0fe5da..551ea233f76 100644
--- a/src/libcore/lib.rs
+++ b/src/libcore/lib.rs
@@ -144,7 +144,7 @@ pub mod convert;
 
 pub mod any;
 pub mod array;
-pub mod atomic;
+pub mod sync;
 pub mod cell;
 pub mod char;
 pub mod panicking;
diff --git a/src/libcore/num/dec2flt/mod.rs b/src/libcore/num/dec2flt/mod.rs
index 7c3c384ea93..4e6b6f04e9e 100644
--- a/src/libcore/num/dec2flt/mod.rs
+++ b/src/libcore/num/dec2flt/mod.rs
@@ -96,8 +96,9 @@
             issue = "0")]
 
 use prelude::v1::*;
-use num::ParseFloatError as PFE;
-use num::FloatErrorKind;
+use fmt;
+use str::FromStr;
+
 use self::parse::{parse_decimal, Decimal, Sign};
 use self::parse::ParseResult::{self, Valid, ShortcutToInf, ShortcutToZero};
 use self::num::digits_to_big;
@@ -110,14 +111,87 @@ mod num;
 pub mod rawfp;
 pub mod parse;
 
-/// Entry point for decimal-to-f32 conversion.
-pub fn to_f32(s: &str) -> Result<f32, PFE> {
-    dec2flt(s)
+macro_rules! from_str_float_impl {
+    ($t:ty, $func:ident) => {
+        #[stable(feature = "rust1", since = "1.0.0")]
+        impl FromStr for $t {
+            type Err = ParseFloatError;
+
+            /// Converts a string in base 10 to a float.
+            /// Accepts an optional decimal exponent.
+            ///
+            /// This function accepts strings such as
+            ///
+            /// * '3.14'
+            /// * '-3.14'
+            /// * '2.5E10', or equivalently, '2.5e10'
+            /// * '2.5E-10'
+            /// * '.' (understood as 0)
+            /// * '5.'
+            /// * '.5', or, equivalently,  '0.5'
+            /// * 'inf', '-inf', 'NaN'
+            ///
+            /// Leading and trailing whitespace represent an error.
+            ///
+            /// # Arguments
+            ///
+            /// * src - A string
+            ///
+            /// # Return value
+            ///
+            /// `Err(ParseFloatError)` if the string did not represent a valid
+            /// number.  Otherwise, `Ok(n)` where `n` is the floating-point
+            /// number represented by `src`.
+            #[inline]
+            fn from_str(src: &str) -> Result<Self, ParseFloatError> {
+                dec2flt(src)
+            }
+        }
+    }
+}
+from_str_float_impl!(f32, to_f32);
+from_str_float_impl!(f64, to_f64);
+
+/// An error which can be returned when parsing a float.
+#[derive(Debug, Clone, PartialEq)]
+#[stable(feature = "rust1", since = "1.0.0")]
+pub struct ParseFloatError {
+    kind: FloatErrorKind
+}
+
+#[derive(Debug, Clone, PartialEq)]
+enum FloatErrorKind {
+    Empty,
+    Invalid,
+}
+
+impl ParseFloatError {
+    #[unstable(feature = "int_error_internals",
+               reason = "available through Error trait and this method should \
+                         not be exposed publicly",
+               issue = "0")]
+    #[doc(hidden)]
+    pub fn __description(&self) -> &str {
+        match self.kind {
+            FloatErrorKind::Empty => "cannot parse float from empty string",
+            FloatErrorKind::Invalid => "invalid float literal",
+        }
+    }
+}
+
+#[stable(feature = "rust1", since = "1.0.0")]
+impl fmt::Display for ParseFloatError {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        self.__description().fmt(f)
+    }
+}
+
+pub fn pfe_empty() -> ParseFloatError {
+    ParseFloatError { kind: FloatErrorKind::Empty }
 }
 
-/// Entry point for decimal-to-f64 conversion.
-pub fn to_f64(s: &str) -> Result<f64, PFE> {
-    dec2flt(s)
+pub fn pfe_invalid() -> ParseFloatError {
+    ParseFloatError { kind: FloatErrorKind::Invalid }
 }
 
 /// Split decimal string into sign and the rest, without inspecting or validating the rest.
@@ -131,9 +205,9 @@ fn extract_sign(s: &str) -> (Sign, &str) {
 }
 
 /// Convert a decimal string into a floating point number.
-fn dec2flt<T: RawFloat>(s: &str) -> Result<T, PFE> {
+fn dec2flt<T: RawFloat>(s: &str) -> Result<T, ParseFloatError> {
     if s.is_empty() {
-        return Err(PFE { __kind: FloatErrorKind::Empty });
+        return Err(pfe_empty())
     }
     let (sign, s) = extract_sign(s);
     let flt = match parse_decimal(s) {
@@ -143,7 +217,7 @@ fn dec2flt<T: RawFloat>(s: &str) -> Result<T, PFE> {
         ParseResult::Invalid => match s {
             "inf" => T::infinity(),
             "NaN" => T::nan(),
-            _ => { return Err(PFE { __kind: FloatErrorKind::Invalid }); }
+            _ => { return Err(pfe_invalid()); }
         }
     };
 
@@ -155,7 +229,7 @@ fn dec2flt<T: RawFloat>(s: &str) -> Result<T, PFE> {
 
 /// The main workhorse for the decimal-to-float conversion: Orchestrate all the preprocessing
 /// and figure out which algorithm should do the actual conversion.
-fn convert<T: RawFloat>(mut decimal: Decimal) -> Result<T, PFE> {
+fn convert<T: RawFloat>(mut decimal: Decimal) -> Result<T, ParseFloatError> {
     simplify(&mut decimal);
     if let Some(x) = trivial_cases(&decimal) {
         return Ok(x);
@@ -172,7 +246,7 @@ fn convert<T: RawFloat>(mut decimal: Decimal) -> Result<T, PFE> {
     // If we exceed this, perhaps while calculating `f * 10^e` in Algorithm R or Algorithm M,
     // we'll crash. So we error out before getting too close, with a generous safety margin.
     if max_digits > 375 {
-        return Err(PFE { __kind: FloatErrorKind::Invalid });
+        return Err(pfe_invalid());
     }
     let f = digits_to_big(decimal.integral, decimal.fractional);
 
diff --git a/src/libcore/num/float_macros.rs b/src/libcore/num/float_macros.rs
index e3fa7047ec8..88c3b756793 100644
--- a/src/libcore/num/float_macros.rs
+++ b/src/libcore/num/float_macros.rs
@@ -23,8 +23,7 @@ macro_rules! from_str_radix_float_impl {
     ($T:ty) => {
         fn from_str_radix(src: &str, radix: u32)
                           -> Result<$T, ParseFloatError> {
-            use num::FloatErrorKind::*;
-            use num::ParseFloatError as PFE;
+            use num::dec2flt::{pfe_empty, pfe_invalid};
 
             // Special values
             match src {
@@ -35,8 +34,8 @@ macro_rules! from_str_radix_float_impl {
             }
 
             let (is_positive, src) =  match src.slice_shift_char() {
-                None             => return Err(PFE { __kind: Empty }),
-                Some(('-', ""))  => return Err(PFE { __kind: Empty }),
+                None             => return Err(pfe_empty()),
+                Some(('-', ""))  => return Err(pfe_empty()),
                 Some(('-', src)) => (false, src),
                 Some((_, _))     => (true,  src),
             };
@@ -88,7 +87,7 @@ macro_rules! from_str_radix_float_impl {
                             break;  // start of fractional part
                         },
                         _ => {
-                            return Err(PFE { __kind: Invalid });
+                            return Err(pfe_invalid())
                         },
                     },
                 }
@@ -122,7 +121,7 @@ macro_rules! from_str_radix_float_impl {
                                 break; // start of exponent
                             },
                             _ => {
-                                return Err(PFE { __kind: Invalid });
+                                return Err(pfe_invalid())
                             },
                         },
                     }
@@ -135,7 +134,7 @@ macro_rules! from_str_radix_float_impl {
                     let base = match c {
                         'E' | 'e' if radix == 10 => 10.0,
                         'P' | 'p' if radix == 16 => 2.0,
-                        _ => return Err(PFE { __kind: Invalid }),
+                        _ => return Err(pfe_invalid()),
                     };
 
                     // Parse the exponent as decimal integer
@@ -144,13 +143,13 @@ macro_rules! from_str_radix_float_impl {
                         Some(('-', src)) => (false, src.parse::<usize>()),
                         Some(('+', src)) => (true,  src.parse::<usize>()),
                         Some((_, _))     => (true,  src.parse::<usize>()),
-                        None             => return Err(PFE { __kind: Invalid }),
+                        None             => return Err(pfe_invalid()),
                     };
 
                     match (is_positive, exp) {
                         (true,  Ok(exp)) => base.powi(exp as i32),
                         (false, Ok(exp)) => 1.0 / base.powi(exp as i32),
-                        (_, Err(_))      => return Err(PFE { __kind: Invalid }),
+                        (_, Err(_))      => return Err(pfe_invalid()),
                     }
                 },
                 None => 1.0, // no exponent
diff --git a/src/libcore/num/i16.rs b/src/libcore/num/i16.rs
index dacb4ebcdfa..40544979417 100644
--- a/src/libcore/num/i16.rs
+++ b/src/libcore/num/i16.rs
@@ -8,7 +8,9 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-//! Operations and constants for signed 16-bits integers (`i16` type)
+//! The 16-bit signed integer type.
+//!
+//! *[See also the `i16` primitive type](../primitive.i16.html).*
 
 #![stable(feature = "rust1", since = "1.0.0")]
 
diff --git a/src/libcore/num/i32.rs b/src/libcore/num/i32.rs
index 250d66de70b..5d2ade8d8e0 100644
--- a/src/libcore/num/i32.rs
+++ b/src/libcore/num/i32.rs
@@ -8,7 +8,9 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-//! Operations and constants for signed 32-bits integers (`i32` type)
+//! The 32-bit signed integer type.
+//!
+//! *[See also the `i32` primitive type](../primitive.i32.html).*
 
 #![stable(feature = "rust1", since = "1.0.0")]
 
diff --git a/src/libcore/num/i64.rs b/src/libcore/num/i64.rs
index 5ed21d7246c..b1d43a3b838 100644
--- a/src/libcore/num/i64.rs
+++ b/src/libcore/num/i64.rs
@@ -8,7 +8,9 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-//! Operations and constants for signed 64-bits integers (`i64` type)
+//! The 64-bit signed integer type.
+//!
+//! *[See also the `i64` primitive type](../primitive.i64.html).*
 
 #![stable(feature = "rust1", since = "1.0.0")]
 
diff --git a/src/libcore/num/i8.rs b/src/libcore/num/i8.rs
index 0394c12d5c4..ee003d92b28 100644
--- a/src/libcore/num/i8.rs
+++ b/src/libcore/num/i8.rs
@@ -8,7 +8,9 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-//! Operations and constants for signed 8-bits integers (`i8` type)
+//! The 8-bit signed integer type.
+//!
+//! *[See also the `i8` primitive type](../primitive.i8.html).*
 
 #![stable(feature = "rust1", since = "1.0.0")]
 
diff --git a/src/libcore/num/isize.rs b/src/libcore/num/isize.rs
index 066cb10cce2..034a5c0eb89 100644
--- a/src/libcore/num/isize.rs
+++ b/src/libcore/num/isize.rs
@@ -8,7 +8,9 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-//! Operations and constants for pointer-sized signed integers (`isize` type)
+//! The pointer-sized signed integer type.
+//!
+//! *[See also the `isize` primitive type](../primitive.isize.html).*
 
 #![stable(feature = "rust1", since = "1.0.0")]
 
diff --git a/src/libcore/num/mod.rs b/src/libcore/num/mod.rs
index 23432a2044c..05c7e8b8de4 100644
--- a/src/libcore/num/mod.rs
+++ b/src/libcore/num/mod.rs
@@ -1327,47 +1327,6 @@ pub trait Float: Sized {
     fn to_radians(self) -> Self;
 }
 
-macro_rules! from_str_float_impl {
-    ($t:ty, $func:ident) => {
-        #[stable(feature = "rust1", since = "1.0.0")]
-        impl FromStr for $t {
-            type Err = ParseFloatError;
-
-            /// Converts a string in base 10 to a float.
-            /// Accepts an optional decimal exponent.
-            ///
-            /// This function accepts strings such as
-            ///
-            /// * '3.14'
-            /// * '-3.14'
-            /// * '2.5E10', or equivalently, '2.5e10'
-            /// * '2.5E-10'
-            /// * '.' (understood as 0)
-            /// * '5.'
-            /// * '.5', or, equivalently,  '0.5'
-            /// * 'inf', '-inf', 'NaN'
-            ///
-            /// Leading and trailing whitespace represent an error.
-            ///
-            /// # Arguments
-            ///
-            /// * src - A string
-            ///
-            /// # Return value
-            ///
-            /// `Err(ParseFloatError)` if the string did not represent a valid
-            /// number.  Otherwise, `Ok(n)` where `n` is the floating-point
-            /// number represented by `src`.
-            #[inline]
-            fn from_str(src: &str) -> Result<Self, ParseFloatError> {
-                dec2flt::$func(src)
-            }
-        }
-    }
-}
-from_str_float_impl!(f32, to_f32);
-from_str_float_impl!(f64, to_f64);
-
 macro_rules! from_str_radix_int_impl {
     ($($t:ty)*) => {$(
         #[stable(feature = "rust1", since = "1.0.0")]
@@ -1510,40 +1469,4 @@ impl fmt::Display for ParseIntError {
     }
 }
 
-/// An error which can be returned when parsing a float.
-#[derive(Debug, Clone, PartialEq)]
-#[stable(feature = "rust1", since = "1.0.0")]
-pub struct ParseFloatError {
-    #[doc(hidden)]
-    #[unstable(feature = "float_error_internals",
-               reason = "should not be exposed publicly",
-               issue = "0")]
-    pub __kind: FloatErrorKind
-}
-
-#[derive(Debug, Clone, PartialEq)]
-#[unstable(feature = "float_error_internals",
-           reason = "should not be exposed publicly",
-           issue = "0")]
-#[doc(hidden)]
-pub enum FloatErrorKind {
-    Empty,
-    Invalid,
-}
-
-impl ParseFloatError {
-    #[doc(hidden)]
-    pub fn __description(&self) -> &str {
-        match self.__kind {
-            FloatErrorKind::Empty => "cannot parse float from empty string",
-            FloatErrorKind::Invalid => "invalid float literal",
-        }
-    }
-}
-
-#[stable(feature = "rust1", since = "1.0.0")]
-impl fmt::Display for ParseFloatError {
-    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        self.__description().fmt(f)
-    }
-}
+pub use num::dec2flt::ParseFloatError;
diff --git a/src/libcore/num/u16.rs b/src/libcore/num/u16.rs
index ecf79944848..68e50e8a400 100644
--- a/src/libcore/num/u16.rs
+++ b/src/libcore/num/u16.rs
@@ -8,7 +8,9 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-//! Operations and constants for unsigned 16-bits integers (`u16` type)
+//! The 16-bit unsigned integer type.
+//!
+//! *[See also the `u16` primitive type](../primitive.u16.html).*
 
 #![stable(feature = "rust1", since = "1.0.0")]
 
diff --git a/src/libcore/num/u32.rs b/src/libcore/num/u32.rs
index b0682b55ac0..c1ee96b363c 100644
--- a/src/libcore/num/u32.rs
+++ b/src/libcore/num/u32.rs
@@ -8,7 +8,9 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-//! Operations and constants for unsigned 32-bits integers (`u32` type)
+//! The 32-bit unsigned integer type.
+//!
+//! *[See also the `u32` primitive type](../primitive.u32.html).*
 
 #![stable(feature = "rust1", since = "1.0.0")]
 
diff --git a/src/libcore/num/u64.rs b/src/libcore/num/u64.rs
index dbc6a64a905..c0d18d850a7 100644
--- a/src/libcore/num/u64.rs
+++ b/src/libcore/num/u64.rs
@@ -8,7 +8,9 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-//! Operations and constants for unsigned 64-bits integer (`u64` type)
+//! The 64-bit unsigned integer type.
+//!
+//! *[See also the `u64` primitive type](../primitive.u64.html).*
 
 #![stable(feature = "rust1", since = "1.0.0")]
 
diff --git a/src/libcore/num/u8.rs b/src/libcore/num/u8.rs
index bf9347ca62c..a60c480d810 100644
--- a/src/libcore/num/u8.rs
+++ b/src/libcore/num/u8.rs
@@ -8,7 +8,9 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-//! Operations and constants for unsigned 8-bits integers (`u8` type)
+//! The 8-bit unsigned integer type.
+//!
+//! *[See also the `u8` primitive type](../primitive.u8.html).*
 
 #![stable(feature = "rust1", since = "1.0.0")]
 
diff --git a/src/libcore/num/usize.rs b/src/libcore/num/usize.rs
index 67e3c954ab6..70e790106e1 100644
--- a/src/libcore/num/usize.rs
+++ b/src/libcore/num/usize.rs
@@ -8,7 +8,9 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-//! Operations and constants for pointer-sized unsigned integers (`usize` type)
+//! The pointer-sized unsigned integer type.
+//!
+//! *[See also the `usize` primitive type](../primitive.usize.html).*
 
 #![stable(feature = "rust1", since = "1.0.0")]
 
diff --git a/src/libcore/prelude/mod.rs b/src/libcore/prelude/mod.rs
index b6c93615378..99b1947c84e 100644
--- a/src/libcore/prelude/mod.rs
+++ b/src/libcore/prelude/mod.rs
@@ -10,4 +10,6 @@
 
 //! The libcore prelude
 
+#![stable(feature = "core_prelude", since = "1.4.0")]
+
 pub mod v1;
diff --git a/src/libcore/prelude/v1.rs b/src/libcore/prelude/v1.rs
index fc4e4e66817..0457188586e 100644
--- a/src/libcore/prelude/v1.rs
+++ b/src/libcore/prelude/v1.rs
@@ -14,27 +14,26 @@
 //! well. This module is imported by default when `#![no_std]` is used in the
 //! same manner as the standard library's prelude.
 
-#![unstable(feature = "core_prelude",
-            reason = "the libcore prelude has not been scrutinized and \
-                      stabilized yet",
-            issue = "27701")]
+#![stable(feature = "core_prelude", since = "1.4.0")]
 
 // Reexported core operators
-pub use marker::{Copy, Send, Sized, Sync};
-pub use ops::{Drop, Fn, FnMut, FnOnce};
+#[doc(no_inline)] pub use marker::{Copy, Send, Sized, Sync};
+#[doc(no_inline)] pub use ops::{Drop, Fn, FnMut, FnOnce};
 
 // Reexported functions
-pub use mem::drop;
+#[doc(no_inline)] pub use mem::drop;
 
 // Reexported types and traits
-pub use char::CharExt;
-pub use clone::Clone;
-pub use cmp::{PartialEq, PartialOrd, Eq, Ord};
-pub use convert::{AsRef, AsMut, Into, From};
-pub use default::Default;
-pub use iter::IntoIterator;
-pub use iter::{Iterator, DoubleEndedIterator, Extend, ExactSizeIterator};
-pub use option::Option::{self, Some, None};
-pub use result::Result::{self, Ok, Err};
-pub use slice::SliceExt;
-pub use str::StrExt;
+#[doc(no_inline)] pub use clone::Clone;
+#[doc(no_inline)] pub use cmp::{PartialEq, PartialOrd, Eq, Ord};
+#[doc(no_inline)] pub use convert::{AsRef, AsMut, Into, From};
+#[doc(no_inline)] pub use default::Default;
+#[doc(no_inline)] pub use iter::{Iterator, Extend, IntoIterator};
+#[doc(no_inline)] pub use iter::{DoubleEndedIterator, ExactSizeIterator};
+#[doc(no_inline)] pub use option::Option::{self, Some, None};
+#[doc(no_inline)] pub use result::Result::{self, Ok, Err};
+
+// Reexported extension traits for primitive types
+#[doc(no_inline)] pub use slice::SliceExt;
+#[doc(no_inline)] pub use str::StrExt;
+#[doc(no_inline)] pub use char::CharExt;
diff --git a/src/libcore/atomic.rs b/src/libcore/sync/atomic.rs
index 53952cdc908..53952cdc908 100644
--- a/src/libcore/atomic.rs
+++ b/src/libcore/sync/atomic.rs
diff --git a/src/libstd/num/int_macros.rs b/src/libcore/sync/mod.rs
index 178fad09f98..0080e0b5e43 100644
--- a/src/libstd/num/int_macros.rs
+++ b/src/libcore/sync/mod.rs
@@ -1,4 +1,4 @@
-// Copyright 2012-2014 The Rust Project Developers. See the COPYRIGHT
+// Copyright 2015 The Rust Project Developers. See the COPYRIGHT
 // file at the top-level directory of this distribution and at
 // http://rust-lang.org/COPYRIGHT.
 //
@@ -8,8 +8,8 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-#![doc(hidden)]
+//! Synchronization primitives
 
-macro_rules! int_module { ($T:ty) => (
+#![stable(feature = "rust1", since = "1.0.0")]
 
-) }
+pub mod atomic;
diff --git a/src/libcoretest/atomic.rs b/src/libcoretest/atomic.rs
index c50f18c2352..b6bb5fddf4a 100644
--- a/src/libcoretest/atomic.rs
+++ b/src/libcoretest/atomic.rs
@@ -8,8 +8,8 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-use core::atomic::*;
-use core::atomic::Ordering::SeqCst;
+use core::sync::atomic::*;
+use core::sync::atomic::Ordering::SeqCst;
 
 #[test]
 fn bool_() {
diff --git a/src/libcoretest/num/dec2flt/mod.rs b/src/libcoretest/num/dec2flt/mod.rs
index b7ef956055e..131cf629575 100644
--- a/src/libcoretest/num/dec2flt/mod.rs
+++ b/src/libcoretest/num/dec2flt/mod.rs
@@ -12,7 +12,6 @@
 
 use std::{i64, f32, f64};
 use test;
-use core::num::dec2flt::{to_f32, to_f64};
 
 mod parse;
 mod rawfp;
@@ -27,11 +26,11 @@ macro_rules! test_literal {
         let inputs = &[stringify!($x).into(), format!("{:?}", x64), format!("{:e}", x64)];
         for input in inputs {
             if input != "inf" {
-                assert_eq!(to_f64(input), Ok(x64));
-                assert_eq!(to_f32(input), Ok(x32));
+                assert_eq!(input.parse(), Ok(x64));
+                assert_eq!(input.parse(), Ok(x32));
                 let neg_input = &format!("-{}", input);
-                assert_eq!(to_f64(neg_input), Ok(-x64));
-                assert_eq!(to_f32(neg_input), Ok(-x32));
+                assert_eq!(neg_input.parse(), Ok(-x64));
+                assert_eq!(neg_input.parse(), Ok(-x32));
             }
         }
     })
@@ -99,83 +98,83 @@ fn fast_path_correct() {
 
 #[test]
 fn lonely_dot() {
-    assert_eq!(to_f64("."), Ok(0.0));
+    assert_eq!(".".parse(), Ok(0.0));
 }
 
 #[test]
 fn nan() {
-    assert!(to_f64("NaN").unwrap().is_nan());
-    assert!(to_f32("NaN").unwrap().is_nan());
+    assert!("NaN".parse::<f32>().unwrap().is_nan());
+    assert!("NaN".parse::<f64>().unwrap().is_nan());
 }
 
 #[test]
 fn inf() {
-    assert_eq!(to_f64("inf"), Ok(f64::INFINITY));
-    assert_eq!(to_f64("-inf"), Ok(f64::NEG_INFINITY));
-    assert_eq!(to_f32("inf"), Ok(f32::INFINITY));
-    assert_eq!(to_f32("-inf"), Ok(f32::NEG_INFINITY));
+    assert_eq!("inf".parse(), Ok(f64::INFINITY));
+    assert_eq!("-inf".parse(), Ok(f64::NEG_INFINITY));
+    assert_eq!("inf".parse(), Ok(f32::INFINITY));
+    assert_eq!("-inf".parse(), Ok(f32::NEG_INFINITY));
 }
 
 #[test]
 fn massive_exponent() {
     let max = i64::MAX;
-    assert_eq!(to_f64(&format!("1e{}000", max)), Ok(f64::INFINITY));
-    assert_eq!(to_f64(&format!("1e-{}000", max)), Ok(0.0));
-    assert_eq!(to_f64(&format!("1e{}000", max)), Ok(f64::INFINITY));
+    assert_eq!(format!("1e{}000", max).parse(), Ok(f64::INFINITY));
+    assert_eq!(format!("1e-{}000", max).parse(), Ok(0.0));
+    assert_eq!(format!("1e{}000", max).parse(), Ok(f64::INFINITY));
 }
 
 #[bench]
 fn bench_0(b: &mut test::Bencher) {
-    b.iter(|| to_f64("0.0"));
+    b.iter(|| "0.0".parse::<f64>());
 }
 
 #[bench]
 fn bench_42(b: &mut test::Bencher) {
-    b.iter(|| to_f64("42"));
+    b.iter(|| "42".parse::<f64>());
 }
 
 #[bench]
 fn bench_huge_int(b: &mut test::Bencher) {
     // 2^128 - 1
-    b.iter(|| to_f64("170141183460469231731687303715884105727"));
+    b.iter(|| "170141183460469231731687303715884105727".parse::<f64>());
 }
 
 #[bench]
 fn bench_short_decimal(b: &mut test::Bencher) {
-    b.iter(|| to_f64("1234.5678"));
+    b.iter(|| "1234.5678".parse::<f64>());
 }
 
 #[bench]
 fn bench_pi_long(b: &mut test::Bencher) {
-    b.iter(|| to_f64("3.14159265358979323846264338327950288"));
+    b.iter(|| "3.14159265358979323846264338327950288".parse::<f64>());
 }
 
 #[bench]
 fn bench_pi_short(b: &mut test::Bencher) {
-    b.iter(|| to_f64("3.141592653589793"))
+    b.iter(|| "3.141592653589793".parse::<f64>())
 }
 
 #[bench]
 fn bench_1e150(b: &mut test::Bencher) {
-    b.iter(|| to_f64("1e150"));
+    b.iter(|| "1e150".parse::<f64>());
 }
 
 #[bench]
 fn bench_long_decimal_and_exp(b: &mut test::Bencher) {
-    b.iter(|| to_f64("727501488517303786137132964064381141071e-123"));
+    b.iter(|| "727501488517303786137132964064381141071e-123".parse::<f64>());
 }
 
 #[bench]
 fn bench_min_subnormal(b: &mut test::Bencher) {
-    b.iter(|| to_f64("5e-324"));
+    b.iter(|| "5e-324".parse::<f64>());
 }
 
 #[bench]
 fn bench_min_normal(b: &mut test::Bencher) {
-    b.iter(|| to_f64("2.2250738585072014e-308"));
+    b.iter(|| "2.2250738585072014e-308".parse::<f64>());
 }
 
 #[bench]
 fn bench_max(b: &mut test::Bencher) {
-    b.iter(|| to_f64("1.7976931348623157e308"));
+    b.iter(|| "1.7976931348623157e308".parse::<f64>());
 }
diff --git a/src/libcoretest/num/uint_macros.rs b/src/libcoretest/num/uint_macros.rs
index 1712345f9d9..25591db64d9 100644
--- a/src/libcoretest/num/uint_macros.rs
+++ b/src/libcoretest/num/uint_macros.rs
@@ -14,6 +14,7 @@ mod tests {
     use core::$T_i::*;
     use num;
     use core::ops::{BitOr, BitAnd, BitXor, Shl, Shr, Not};
+    use std::str::FromStr;
 
     #[test]
     fn test_overflows() {
@@ -121,6 +122,35 @@ mod tests {
         assert!((10 as $T).checked_div(2) == Some(5));
         assert!((5 as $T).checked_div(0) == None);
     }
-}
 
+    fn from_str<T: FromStr>(t: &str) -> Option<T> {
+        FromStr::from_str(t).ok()
+    }
+
+    #[test]
+    pub fn test_from_str() {
+        assert_eq!(from_str::<$T>("0"), Some(0 as $T));
+        assert_eq!(from_str::<$T>("3"), Some(3 as $T));
+        assert_eq!(from_str::<$T>("10"), Some(10 as $T));
+        assert_eq!(from_str::<u32>("123456789"), Some(123456789 as u32));
+        assert_eq!(from_str::<$T>("00100"), Some(100 as $T));
+
+        assert_eq!(from_str::<$T>(""), None);
+        assert_eq!(from_str::<$T>(" "), None);
+        assert_eq!(from_str::<$T>("x"), None);
+    }
+
+    #[test]
+    pub fn test_parse_bytes() {
+        assert_eq!($T::from_str_radix("123", 10), Ok(123 as $T));
+        assert_eq!($T::from_str_radix("1001", 2), Ok(9 as $T));
+        assert_eq!($T::from_str_radix("123", 8), Ok(83 as $T));
+        assert_eq!(u16::from_str_radix("123", 16), Ok(291 as u16));
+        assert_eq!(u16::from_str_radix("ffff", 16), Ok(65535 as u16));
+        assert_eq!($T::from_str_radix("z", 36), Ok(35 as $T));
+
+        assert_eq!($T::from_str_radix("Z", 10).ok(), None::<$T>);
+        assert_eq!($T::from_str_radix("_", 2).ok(), None::<$T>);
+    }
+}
 )}
diff --git a/src/libstd/lib.rs b/src/libstd/lib.rs
index baca87809a6..179f0727d46 100644
--- a/src/libstd/lib.rs
+++ b/src/libstd/lib.rs
@@ -254,7 +254,6 @@
 // Don't link to std. We are std.
 #![no_std]
 
-#![allow(trivial_casts)]
 #![deny(missing_docs)]
 
 #[cfg(test)] extern crate test;
@@ -264,7 +263,7 @@
 // imported by the compiler (via our #[no_std] attribute) In this case we just
 // add a new crate name so we can attach the reexports to it.
 #[macro_reexport(assert, assert_eq, debug_assert, debug_assert_eq,
-    unreachable, unimplemented, write, writeln)]
+                 unreachable, unimplemented, write, writeln)]
 extern crate core as __core;
 
 #[macro_use]
@@ -309,7 +308,6 @@ pub use core_collections::fmt;
 pub use core_collections::slice;
 pub use core_collections::str;
 pub use core_collections::string;
-#[stable(feature = "rust1", since = "1.0.0")]
 pub use core_collections::vec;
 
 pub use rustc_unicode::char;
@@ -328,32 +326,21 @@ pub mod prelude;
 
 /* Primitive types */
 
-// NB: slice and str are primitive types too, but their module docs + primitive doc pages
-// are inlined from the public re-exports of core_collections::{slice, str} above.
-
-#[path = "num/float_macros.rs"]
-#[macro_use]
-mod float_macros;
-
-#[path = "num/int_macros.rs"]
-#[macro_use]
-mod int_macros;
-
-#[path = "num/uint_macros.rs"]
-#[macro_use]
-mod uint_macros;
-
-#[path = "num/isize.rs"]  pub mod isize;
-#[path = "num/i8.rs"]   pub mod i8;
-#[path = "num/i16.rs"]  pub mod i16;
-#[path = "num/i32.rs"]  pub mod i32;
-#[path = "num/i64.rs"]  pub mod i64;
-
-#[path = "num/usize.rs"] pub mod usize;
-#[path = "num/u8.rs"]   pub mod u8;
-#[path = "num/u16.rs"]  pub mod u16;
-#[path = "num/u32.rs"]  pub mod u32;
-#[path = "num/u64.rs"]  pub mod u64;
+// NB: slice and str are primitive types too, but their module docs + primitive
+// doc pages are inlined from the public re-exports of core_collections::{slice,
+// str} above.
+
+pub use core::isize;
+pub use core::i8;
+pub use core::i16;
+pub use core::i32;
+pub use core::i64;
+
+pub use core::usize;
+pub use core::u8;
+pub use core::u16;
+pub use core::u32;
+pub use core::u64;
 
 #[path = "num/f32.rs"]   pub mod f32;
 #[path = "num/f64.rs"]   pub mod f64;
diff --git a/src/libstd/macros.rs b/src/libstd/macros.rs
index eb378bf4080..53a14c2b21b 100644
--- a/src/libstd/macros.rs
+++ b/src/libstd/macros.rs
@@ -197,6 +197,15 @@ macro_rules! log {
     )
 }
 
+#[cfg(test)]
+macro_rules! assert_approx_eq {
+    ($a:expr, $b:expr) => ({
+        let (a, b) = (&$a, &$b);
+        assert!((*a - *b).abs() < 1.0e-6,
+                "{} is not approximately equal to {}", *a, *b);
+    })
+}
+
 /// Built-in macros to the compiler itself.
 ///
 /// These macros do not have any corresponding definition with a `macro_rules!`
diff --git a/src/libstd/num/float_macros.rs b/src/libstd/num/float_macros.rs
deleted file mode 100644
index 16ad21a07d7..00000000000
--- a/src/libstd/num/float_macros.rs
+++ /dev/null
@@ -1,19 +0,0 @@
-// Copyright 2014 The Rust Project Developers. See the COPYRIGHT
-// file at the top-level directory of this distribution and at
-// http://rust-lang.org/COPYRIGHT.
-//
-// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
-// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
-// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
-// option. This file may not be copied, modified, or distributed
-// except according to those terms.
-
-#![doc(hidden)]
-
-macro_rules! assert_approx_eq {
-    ($a:expr, $b:expr) => ({
-        let (a, b) = (&$a, &$b);
-        assert!((*a - *b).abs() < 1.0e-6,
-                "{} is not approximately equal to {}", *a, *b);
-    })
-}
diff --git a/src/libstd/num/i16.rs b/src/libstd/num/i16.rs
deleted file mode 100644
index eb53e0821f2..00000000000
--- a/src/libstd/num/i16.rs
+++ /dev/null
@@ -1,19 +0,0 @@
-// Copyright 2012 The Rust Project Developers. See the COPYRIGHT
-// file at the top-level directory of this distribution and at
-// http://rust-lang.org/COPYRIGHT.
-//
-// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
-// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
-// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
-// option. This file may not be copied, modified, or distributed
-// except according to those terms.
-
-//! The 16-bit signed integer type.
-//!
-//! *[See also the `i16` primitive type](../primitive.i16.html).*
-
-#![stable(feature = "rust1", since = "1.0.0")]
-
-pub use core::i16::{BITS, BYTES, MIN, MAX};
-
-int_module! { i16 }
diff --git a/src/libstd/num/i32.rs b/src/libstd/num/i32.rs
deleted file mode 100644
index 3c9eedf38c7..00000000000
--- a/src/libstd/num/i32.rs
+++ /dev/null
@@ -1,19 +0,0 @@
-// Copyright 2012 The Rust Project Developers. See the COPYRIGHT
-// file at the top-level directory of this distribution and at
-// http://rust-lang.org/COPYRIGHT.
-//
-// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
-// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
-// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
-// option. This file may not be copied, modified, or distributed
-// except according to those terms.
-
-//! The 32-bit signed integer type.
-//!
-//! *[See also the `i32` primitive type](../primitive.i32.html).*
-
-#![stable(feature = "rust1", since = "1.0.0")]
-
-pub use core::i32::{BITS, BYTES, MIN, MAX};
-
-int_module! { i32 }
diff --git a/src/libstd/num/i64.rs b/src/libstd/num/i64.rs
deleted file mode 100644
index 2df7478a820..00000000000
--- a/src/libstd/num/i64.rs
+++ /dev/null
@@ -1,19 +0,0 @@
-// Copyright 2012 The Rust Project Developers. See the COPYRIGHT
-// file at the top-level directory of this distribution and at
-// http://rust-lang.org/COPYRIGHT.
-//
-// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
-// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
-// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
-// option. This file may not be copied, modified, or distributed
-// except according to those terms.
-
-//! The 64-bit signed integer type.
-//!
-//! *[See also the `i64` primitive type](../primitive.i64.html).*
-
-#![stable(feature = "rust1", since = "1.0.0")]
-
-pub use core::i64::{BITS, BYTES, MIN, MAX};
-
-int_module! { i64 }
diff --git a/src/libstd/num/i8.rs b/src/libstd/num/i8.rs
deleted file mode 100644
index 4e4bee8a791..00000000000
--- a/src/libstd/num/i8.rs
+++ /dev/null
@@ -1,19 +0,0 @@
-// Copyright 2012 The Rust Project Developers. See the COPYRIGHT
-// file at the top-level directory of this distribution and at
-// http://rust-lang.org/COPYRIGHT.
-//
-// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
-// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
-// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
-// option. This file may not be copied, modified, or distributed
-// except according to those terms.
-
-//! The 8-bit signed integer type.
-//!
-//! *[See also the `i8` primitive type](../primitive.i8.html).*
-
-#![stable(feature = "rust1", since = "1.0.0")]
-
-pub use core::i8::{BITS, BYTES, MIN, MAX};
-
-int_module! { i8 }
diff --git a/src/libstd/num/isize.rs b/src/libstd/num/isize.rs
deleted file mode 100644
index d46b6b80d0d..00000000000
--- a/src/libstd/num/isize.rs
+++ /dev/null
@@ -1,19 +0,0 @@
-// Copyright 2012-2015 The Rust Project Developers. See the COPYRIGHT
-// file at the top-level directory of this distribution and at
-// http://rust-lang.org/COPYRIGHT.
-//
-// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
-// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
-// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
-// option. This file may not be copied, modified, or distributed
-// except according to those terms.
-
-//! The pointer-sized signed integer type.
-//!
-//! *[See also the `isize` primitive type](../primitive.isize.html).*
-
-#![stable(feature = "rust1", since = "1.0.0")]
-
-pub use core::isize::{BITS, BYTES, MIN, MAX};
-
-int_module! { isize }
diff --git a/src/libstd/num/u16.rs b/src/libstd/num/u16.rs
deleted file mode 100644
index 893618aeffa..00000000000
--- a/src/libstd/num/u16.rs
+++ /dev/null
@@ -1,19 +0,0 @@
-// Copyright 2012 The Rust Project Developers. See the COPYRIGHT
-// file at the top-level directory of this distribution and at
-// http://rust-lang.org/COPYRIGHT.
-//
-// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
-// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
-// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
-// option. This file may not be copied, modified, or distributed
-// except according to those terms.
-
-//! The 16-bit unsigned integer type.
-//!
-//! *[See also the `u16` primitive type](../primitive.u16.html).*
-
-#![stable(feature = "rust1", since = "1.0.0")]
-
-pub use core::u16::{BITS, BYTES, MIN, MAX};
-
-uint_module! { u16 }
diff --git a/src/libstd/num/u32.rs b/src/libstd/num/u32.rs
deleted file mode 100644
index 2da25519696..00000000000
--- a/src/libstd/num/u32.rs
+++ /dev/null
@@ -1,19 +0,0 @@
-// Copyright 2012 The Rust Project Developers. See the COPYRIGHT
-// file at the top-level directory of this distribution and at
-// http://rust-lang.org/COPYRIGHT.
-//
-// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
-// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
-// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
-// option. This file may not be copied, modified, or distributed
-// except according to those terms.
-
-//! The 32-bit unsigned integer type.
-//!
-//! *[See also the `u32` primitive type](../primitive.u32.html).*
-
-#![stable(feature = "rust1", since = "1.0.0")]
-
-pub use core::u32::{BITS, BYTES, MIN, MAX};
-
-uint_module! { u32 }
diff --git a/src/libstd/num/u64.rs b/src/libstd/num/u64.rs
deleted file mode 100644
index 26a8b537394..00000000000
--- a/src/libstd/num/u64.rs
+++ /dev/null
@@ -1,19 +0,0 @@
-// Copyright 2012 The Rust Project Developers. See the COPYRIGHT
-// file at the top-level directory of this distribution and at
-// http://rust-lang.org/COPYRIGHT.
-//
-// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
-// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
-// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
-// option. This file may not be copied, modified, or distributed
-// except according to those terms.
-
-//! The 64-bit unsigned integer type.
-//!
-//! *[See also the `u64` primitive type](../primitive.u64.html).*
-
-#![stable(feature = "rust1", since = "1.0.0")]
-
-pub use core::u64::{BITS, BYTES, MIN, MAX};
-
-uint_module! { u64 }
diff --git a/src/libstd/num/u8.rs b/src/libstd/num/u8.rs
deleted file mode 100644
index 385754b93a0..00000000000
--- a/src/libstd/num/u8.rs
+++ /dev/null
@@ -1,19 +0,0 @@
-// Copyright 2012 The Rust Project Developers. See the COPYRIGHT
-// file at the top-level directory of this distribution and at
-// http://rust-lang.org/COPYRIGHT.
-//
-// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
-// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
-// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
-// option. This file may not be copied, modified, or distributed
-// except according to those terms.
-
-//! The 8-bit unsigned integer type.
-//!
-//! *[See also the `u8` primitive type](../primitive.u8.html).*
-
-#![stable(feature = "rust1", since = "1.0.0")]
-
-pub use core::u8::{BITS, BYTES, MIN, MAX};
-
-uint_module! { u8 }
diff --git a/src/libstd/num/uint_macros.rs b/src/libstd/num/uint_macros.rs
deleted file mode 100644
index 902c78c0a46..00000000000
--- a/src/libstd/num/uint_macros.rs
+++ /dev/null
@@ -1,50 +0,0 @@
-// Copyright 2012-2014 The Rust Project Developers. See the COPYRIGHT
-// file at the top-level directory of this distribution and at
-// http://rust-lang.org/COPYRIGHT.
-//
-// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
-// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
-// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
-// option. This file may not be copied, modified, or distributed
-// except according to those terms.
-
-#![doc(hidden)]
-
-macro_rules! uint_module { ($T:ident) => (
-
-#[cfg(test)]
-mod tests {
-    use prelude::v1::*;
-
-    fn from_str<T: ::str::FromStr>(t: &str) -> Option<T> {
-        ::str::FromStr::from_str(t).ok()
-    }
-
-    #[test]
-    pub fn test_from_str() {
-        assert_eq!(from_str::<$T>("0"), Some(0 as $T));
-        assert_eq!(from_str::<$T>("3"), Some(3 as $T));
-        assert_eq!(from_str::<$T>("10"), Some(10 as $T));
-        assert_eq!(from_str::<u32>("123456789"), Some(123456789 as u32));
-        assert_eq!(from_str::<$T>("00100"), Some(100 as $T));
-
-        assert_eq!(from_str::<$T>(""), None);
-        assert_eq!(from_str::<$T>(" "), None);
-        assert_eq!(from_str::<$T>("x"), None);
-    }
-
-    #[test]
-    pub fn test_parse_bytes() {
-        assert_eq!($T::from_str_radix("123", 10), Ok(123 as $T));
-        assert_eq!($T::from_str_radix("1001", 2), Ok(9 as $T));
-        assert_eq!($T::from_str_radix("123", 8), Ok(83 as $T));
-        assert_eq!(u16::from_str_radix("123", 16), Ok(291 as u16));
-        assert_eq!(u16::from_str_radix("ffff", 16), Ok(65535 as u16));
-        assert_eq!($T::from_str_radix("z", 36), Ok(35 as $T));
-
-        assert_eq!($T::from_str_radix("Z", 10).ok(), None::<$T>);
-        assert_eq!($T::from_str_radix("_", 2).ok(), None::<$T>);
-    }
-}
-
-) }
diff --git a/src/libstd/num/usize.rs b/src/libstd/num/usize.rs
deleted file mode 100644
index 6960ba3b829..00000000000
--- a/src/libstd/num/usize.rs
+++ /dev/null
@@ -1,19 +0,0 @@
-// Copyright 2012-2015 The Rust Project Developers. See the COPYRIGHT
-// file at the top-level directory of this distribution and at
-// http://rust-lang.org/COPYRIGHT.
-//
-// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
-// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
-// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
-// option. This file may not be copied, modified, or distributed
-// except according to those terms.
-
-//! The pointer-sized unsigned integer type.
-//!
-//! *[See also the `usize` primitive type](../primitive.usize.html).*
-
-#![stable(feature = "rust1", since = "1.0.0")]
-
-pub use core::usize::{BITS, BYTES, MIN, MAX};
-
-uint_module! { usize }
diff --git a/src/libstd/sync/mod.rs b/src/libstd/sync/mod.rs
index ae21503cf67..4544f30d4f4 100644
--- a/src/libstd/sync/mod.rs
+++ b/src/libstd/sync/mod.rs
@@ -18,7 +18,7 @@
 #![stable(feature = "rust1", since = "1.0.0")]
 
 pub use alloc::arc::{Arc, Weak};
-pub use core::atomic;
+pub use core::sync::atomic;
 
 pub use self::barrier::{Barrier, BarrierWaitResult};
 pub use self::condvar::{Condvar, StaticCondvar, WaitTimeoutResult, CONDVAR_INIT};
diff --git a/src/test/compile-fail/issue-1920-1.rs b/src/test/compile-fail/issue-1920-1.rs
index c26c5ff8421..8c75d4680fa 100644
--- a/src/test/compile-fail/issue-1920-1.rs
+++ b/src/test/compile-fail/issue-1920-1.rs
@@ -17,6 +17,6 @@ mod foo {
 fn assert_clone<T>() where T : Clone { }
 
 fn main() {
-    assert_clone::<foo::core::atomic::AtomicBool>();
+    assert_clone::<foo::core::sync::atomic::AtomicBool>();
     //~^ ERROR the trait `foo::core::clone::Clone` is not implemented for the type `foo::core::
-}
\ No newline at end of file
+}
diff --git a/src/test/compile-fail/issue-1920-2.rs b/src/test/compile-fail/issue-1920-2.rs
index 63cfcbdd8c7..57eb82a156b 100644
--- a/src/test/compile-fail/issue-1920-2.rs
+++ b/src/test/compile-fail/issue-1920-2.rs
@@ -15,6 +15,6 @@ extern crate core as bar;
 fn assert_clone<T>() where T : Clone { }
 
 fn main() {
-    assert_clone::<bar::atomic::AtomicBool>();
-    //~^ ERROR the trait `bar::clone::Clone` is not implemented for the type `bar::atomic::
-}
\ No newline at end of file
+    assert_clone::<bar::sync::atomic::AtomicBool>();
+    //~^ ERROR the trait `bar::clone::Clone` is not implemented for the type `bar::sync::atomic::
+}
diff --git a/src/test/compile-fail/issue-1920-3.rs b/src/test/compile-fail/issue-1920-3.rs
index 619c8c3f3a4..0ef7747c8a8 100644
--- a/src/test/compile-fail/issue-1920-3.rs
+++ b/src/test/compile-fail/issue-1920-3.rs
@@ -19,6 +19,6 @@ extern crate core;
 fn assert_clone<T>() where T : Clone { }
 
 fn main() {
-    assert_clone::<foo::core::atomic::AtomicBool>();
-    //~^ ERROR the trait `core::clone::Clone` is not implemented for the type `core::atomic::
-}
\ No newline at end of file
+    assert_clone::<foo::core::sync::atomic::AtomicBool>();
+    //~^ ERROR the trait `core::clone::Clone` is not implemented for the type `core::sync::atomic::
+}