std: Bring back f32::from_str_radix as an unstable API

This API was exercised in a few tests and mirrors the `from_str_radix`
functionality of the integer types.

4 files changed, 284 insertions, 761 deletions

diff --git a/src/libstd/num/f32.rs b/src/libstd/num/f32.rs
index 430fec4ff2e..0efc04ef83c 100644
--- a/src/libstd/num/f32.rs
+++ b/src/libstd/num/f32.rs
@@ -15,11 +15,13 @@
 #![allow(unsigned_negation)]
 #![doc(primitive = "f32")]
 
-use intrinsics;
-use libc::c_int;
-use num::FpCategory;
+use prelude::v1::*;
 
 use core::num;
+use intrinsics;
+use libc::c_int;
+use num::{FpCategory, ParseFloatError};
+use sys_common::FromInner;
 
 pub use core::f32::{RADIX, MANTISSA_DIGITS, DIGITS, EPSILON};
 pub use core::f32::{MIN_EXP, MAX_EXP, MIN_10_EXP};
@@ -72,6 +74,12 @@ mod cmath {
 #[lang = "f32"]
 #[stable(feature = "rust1", since = "1.0.0")]
 impl f32 {
+    /// Parses a float as with a given radix
+    #[unstable(feature = "float_from_str_radix", reason = "recently moved API")]
+    pub fn from_str_radix(s: &str, radix: u32) -> Result<f32, ParseFloatError> {
+        num::Float::from_str_radix(s, radix).map_err(FromInner::from_inner)
+    }
+
     /// Returns `true` if this value is `NaN` and false otherwise.
     ///
     /// ```
@@ -1021,7 +1029,7 @@ impl f32 {
     #[inline]
     pub fn acosh(self) -> f32 {
         match self {
-            x if x < 1.0 => num::Float::nan(),
+            x if x < 1.0 => ::f32::NAN,
             x => (x + ((x * x) - 1.0).sqrt()).ln(),
         }
     }
@@ -1047,6 +1055,7 @@ impl f32 {
 
 #[cfg(test)]
 mod tests {
+    use f32;
     use f32::*;
     use num::*;
     use num::FpCategory as Fp;
@@ -1070,7 +1079,7 @@ mod tests {
 
     #[test]
     fn test_nan() {
-        let nan: f32 = Float::nan();
+        let nan: f32 = f32::NAN;
         assert!(nan.is_nan());
         assert!(!nan.is_infinite());
         assert!(!nan.is_finite());
@@ -1082,7 +1091,7 @@ mod tests {
 
     #[test]
     fn test_infinity() {
-        let inf: f32 = Float::infinity();
+        let inf: f32 = f32::INFINITY;
         assert!(inf.is_infinite());
         assert!(!inf.is_finite());
         assert!(inf.is_sign_positive());
@@ -1094,7 +1103,7 @@ mod tests {
 
     #[test]
     fn test_neg_infinity() {
-        let neg_inf: f32 = Float::neg_infinity();
+        let neg_inf: f32 = f32::NEG_INFINITY;
         assert!(neg_inf.is_infinite());
         assert!(!neg_inf.is_finite());
         assert!(!neg_inf.is_sign_positive());
@@ -1106,7 +1115,7 @@ mod tests {
 
     #[test]
     fn test_zero() {
-        let zero: f32 = Float::zero();
+        let zero: f32 = 0.0f32;
         assert_eq!(0.0, zero);
         assert!(!zero.is_infinite());
         assert!(zero.is_finite());
@@ -1119,7 +1128,7 @@ mod tests {
 
     #[test]
     fn test_neg_zero() {
-        let neg_zero: f32 = Float::neg_zero();
+        let neg_zero: f32 = -0.0;
         assert_eq!(0.0, neg_zero);
         assert!(!neg_zero.is_infinite());
         assert!(neg_zero.is_finite());
@@ -1132,7 +1141,7 @@ mod tests {
 
     #[test]
     fn test_one() {
-        let one: f32 = Float::one();
+        let one: f32 = 1.0f32;
         assert_eq!(1.0, one);
         assert!(!one.is_infinite());
         assert!(one.is_finite());
@@ -1145,9 +1154,9 @@ mod tests {
 
     #[test]
     fn test_is_nan() {
-        let nan: f32 = Float::nan();
-        let inf: f32 = Float::infinity();
-        let neg_inf: f32 = Float::neg_infinity();
+        let nan: f32 = f32::NAN;
+        let inf: f32 = f32::INFINITY;
+        let neg_inf: f32 = f32::NEG_INFINITY;
         assert!(nan.is_nan());
         assert!(!0.0f32.is_nan());
         assert!(!5.3f32.is_nan());
@@ -1158,9 +1167,9 @@ mod tests {
 
     #[test]
     fn test_is_infinite() {
-        let nan: f32 = Float::nan();
-        let inf: f32 = Float::infinity();
-        let neg_inf: f32 = Float::neg_infinity();
+        let nan: f32 = f32::NAN;
+        let inf: f32 = f32::INFINITY;
+        let neg_inf: f32 = f32::NEG_INFINITY;
         assert!(!nan.is_infinite());
         assert!(inf.is_infinite());
         assert!(neg_inf.is_infinite());
@@ -1171,9 +1180,9 @@ mod tests {
 
     #[test]
     fn test_is_finite() {
-        let nan: f32 = Float::nan();
-        let inf: f32 = Float::infinity();
-        let neg_inf: f32 = Float::neg_infinity();
+        let nan: f32 = f32::NAN;
+        let inf: f32 = f32::INFINITY;
+        let neg_inf: f32 = f32::NEG_INFINITY;
         assert!(!nan.is_finite());
         assert!(!inf.is_finite());
         assert!(!neg_inf.is_finite());
@@ -1184,11 +1193,11 @@ mod tests {
 
     #[test]
     fn test_is_normal() {
-        let nan: f32 = Float::nan();
-        let inf: f32 = Float::infinity();
-        let neg_inf: f32 = Float::neg_infinity();
-        let zero: f32 = Float::zero();
-        let neg_zero: f32 = Float::neg_zero();
+        let nan: f32 = f32::NAN;
+        let inf: f32 = f32::INFINITY;
+        let neg_inf: f32 = f32::NEG_INFINITY;
+        let zero: f32 = 0.0f32;
+        let neg_zero: f32 = -0.0;
         assert!(!nan.is_normal());
         assert!(!inf.is_normal());
         assert!(!neg_inf.is_normal());
@@ -1201,11 +1210,11 @@ mod tests {
 
     #[test]
     fn test_classify() {
-        let nan: f32 = Float::nan();
-        let inf: f32 = Float::infinity();
-        let neg_inf: f32 = Float::neg_infinity();
-        let zero: f32 = Float::zero();
-        let neg_zero: f32 = Float::neg_zero();
+        let nan: f32 = f32::NAN;
+        let inf: f32 = f32::INFINITY;
+        let neg_inf: f32 = f32::NEG_INFINITY;
+        let zero: f32 = 0.0f32;
+        let neg_zero: f32 = -0.0;
         assert_eq!(nan.classify(), Fp::Nan);
         assert_eq!(inf.classify(), Fp::Infinite);
         assert_eq!(neg_inf.classify(), Fp::Infinite);
@@ -1348,9 +1357,9 @@ mod tests {
 
     #[test]
     fn test_mul_add() {
-        let nan: f32 = Float::nan();
-        let inf: f32 = Float::infinity();
-        let neg_inf: f32 = Float::neg_infinity();
+        let nan: f32 = f32::NAN;
+        let inf: f32 = f32::INFINITY;
+        let neg_inf: f32 = f32::NEG_INFINITY;
         assert_approx_eq!(12.3f32.mul_add(4.5, 6.7), 62.05);
         assert_approx_eq!((-12.3f32).mul_add(-4.5, -6.7), 48.65);
         assert_approx_eq!(0.0f32.mul_add(8.9, 1.2), 1.2);
@@ -1364,9 +1373,9 @@ mod tests {
 
     #[test]
     fn test_recip() {
-        let nan: f32 = Float::nan();
-        let inf: f32 = Float::infinity();
-        let neg_inf: f32 = Float::neg_infinity();
+        let nan: f32 = f32::NAN;
+        let inf: f32 = f32::INFINITY;
+        let neg_inf: f32 = f32::NEG_INFINITY;
         assert_eq!(1.0f32.recip(), 1.0);
         assert_eq!(2.0f32.recip(), 0.5);
         assert_eq!((-0.4f32).recip(), -2.5);
@@ -1378,9 +1387,9 @@ mod tests {
 
     #[test]
     fn test_powi() {
-        let nan: f32 = Float::nan();
-        let inf: f32 = Float::infinity();
-        let neg_inf: f32 = Float::neg_infinity();
+        let nan: f32 = f32::NAN;
+        let inf: f32 = f32::INFINITY;
+        let neg_inf: f32 = f32::NEG_INFINITY;
         assert_eq!(1.0f32.powi(1), 1.0);
         assert_approx_eq!((-3.1f32).powi(2), 9.61);
         assert_approx_eq!(5.9f32.powi(-2), 0.028727);
@@ -1392,9 +1401,9 @@ mod tests {
 
     #[test]
     fn test_powf() {
-        let nan: f32 = Float::nan();
-        let inf: f32 = Float::infinity();
-        let neg_inf: f32 = Float::neg_infinity();
+        let nan: f32 = f32::NAN;
+        let inf: f32 = f32::INFINITY;
+        let neg_inf: f32 = f32::NEG_INFINITY;
         assert_eq!(1.0f32.powf(1.0), 1.0);
         assert_approx_eq!(3.4f32.powf(4.5), 246.408218);
         assert_approx_eq!(2.7f32.powf(-3.2), 0.041652);
@@ -1418,29 +1427,14 @@ mod tests {
     }
 
     #[test]
-    fn test_rsqrt() {
-        let nan: f32 = Float::nan();
-        let inf: f32 = Float::infinity();
-        let neg_inf: f32 = Float::neg_infinity();
-        assert!(nan.rsqrt().is_nan());
-        assert_eq!(inf.rsqrt(), 0.0);
-        assert!(neg_inf.rsqrt().is_nan());
-        assert!((-1.0f32).rsqrt().is_nan());
-        assert_eq!((-0.0f32).rsqrt(), neg_inf);
-        assert_eq!(0.0f32.rsqrt(), inf);
-        assert_eq!(1.0f32.rsqrt(), 1.0);
-        assert_eq!(4.0f32.rsqrt(), 0.5);
-    }
-
-    #[test]
     fn test_exp() {
         assert_eq!(1.0, 0.0f32.exp());
         assert_approx_eq!(2.718282, 1.0f32.exp());
         assert_approx_eq!(148.413162, 5.0f32.exp());
 
-        let inf: f32 = Float::infinity();
-        let neg_inf: f32 = Float::neg_infinity();
-        let nan: f32 = Float::nan();
+        let inf: f32 = f32::INFINITY;
+        let neg_inf: f32 = f32::NEG_INFINITY;
+        let nan: f32 = f32::NAN;
         assert_eq!(inf, inf.exp());
         assert_eq!(0.0, neg_inf.exp());
         assert!(nan.exp().is_nan());
@@ -1451,9 +1445,9 @@ mod tests {
         assert_eq!(32.0, 5.0f32.exp2());
         assert_eq!(1.0, 0.0f32.exp2());
 
-        let inf: f32 = Float::infinity();
-        let neg_inf: f32 = Float::neg_infinity();
-        let nan: f32 = Float::nan();
+        let inf: f32 = f32::INFINITY;
+        let neg_inf: f32 = f32::NEG_INFINITY;
+        let nan: f32 = f32::NAN;
         assert_eq!(inf, inf.exp2());
         assert_eq!(0.0, neg_inf.exp2());
         assert!(nan.exp2().is_nan());
@@ -1461,9 +1455,9 @@ mod tests {
 
     #[test]
     fn test_ln() {
-        let nan: f32 = Float::nan();
-        let inf: f32 = Float::infinity();
-        let neg_inf: f32 = Float::neg_infinity();
+        let nan: f32 = f32::NAN;
+        let inf: f32 = f32::INFINITY;
+        let neg_inf: f32 = f32::NEG_INFINITY;
         assert_approx_eq!(1.0f32.exp().ln(), 1.0);
         assert!(nan.ln().is_nan());
         assert_eq!(inf.ln(), inf);
@@ -1476,12 +1470,12 @@ mod tests {
 
     #[test]
     fn test_log() {
-        let nan: f32 = Float::nan();
-        let inf: f32 = Float::infinity();
-        let neg_inf: f32 = Float::neg_infinity();
+        let nan: f32 = f32::NAN;
+        let inf: f32 = f32::INFINITY;
+        let neg_inf: f32 = f32::NEG_INFINITY;
         assert_eq!(10.0f32.log(10.0), 1.0);
         assert_approx_eq!(2.3f32.log(3.5), 0.664858);
-        assert_eq!(1.0f32.exp().log(1.0.exp()), 1.0);
+        assert_eq!(1.0f32.exp().log(1.0f32.exp()), 1.0);
         assert!(1.0f32.log(1.0).is_nan());
         assert!(1.0f32.log(-13.9).is_nan());
         assert!(nan.log(2.3).is_nan());
@@ -1494,9 +1488,9 @@ mod tests {
 
     #[test]
     fn test_log2() {
-        let nan: f32 = Float::nan();
-        let inf: f32 = Float::infinity();
-        let neg_inf: f32 = Float::neg_infinity();
+        let nan: f32 = f32::NAN;
+        let inf: f32 = f32::INFINITY;
+        let neg_inf: f32 = f32::NEG_INFINITY;
         assert_approx_eq!(10.0f32.log2(), 3.321928);
         assert_approx_eq!(2.3f32.log2(), 1.201634);
         assert_approx_eq!(1.0f32.exp().log2(), 1.442695);
@@ -1510,9 +1504,9 @@ mod tests {
 
     #[test]
     fn test_log10() {
-        let nan: f32 = Float::nan();
-        let inf: f32 = Float::infinity();
-        let neg_inf: f32 = Float::neg_infinity();
+        let nan: f32 = f32::NAN;
+        let inf: f32 = f32::INFINITY;
+        let neg_inf: f32 = f32::NEG_INFINITY;
         assert_eq!(10.0f32.log10(), 1.0);
         assert_approx_eq!(2.3f32.log10(), 0.361728);
         assert_approx_eq!(1.0f32.exp().log10(), 0.434294);
@@ -1528,9 +1522,9 @@ mod tests {
     #[test]
     fn test_to_degrees() {
         let pi: f32 = consts::PI;
-        let nan: f32 = Float::nan();
-        let inf: f32 = Float::infinity();
-        let neg_inf: f32 = Float::neg_infinity();
+        let nan: f32 = f32::NAN;
+        let inf: f32 = f32::INFINITY;
+        let neg_inf: f32 = f32::NEG_INFINITY;
         assert_eq!(0.0f32.to_degrees(), 0.0);
         assert_approx_eq!((-5.8f32).to_degrees(), -332.315521);
         assert_eq!(pi.to_degrees(), 180.0);
@@ -1542,9 +1536,9 @@ mod tests {
     #[test]
     fn test_to_radians() {
         let pi: f32 = consts::PI;
-        let nan: f32 = Float::nan();
-        let inf: f32 = Float::infinity();
-        let neg_inf: f32 = Float::neg_infinity();
+        let nan: f32 = f32::NAN;
+        let inf: f32 = f32::INFINITY;
+        let neg_inf: f32 = f32::NEG_INFINITY;
         assert_eq!(0.0f32.to_radians(), 0.0);
         assert_approx_eq!(154.6f32.to_radians(), 2.698279);
         assert_approx_eq!((-332.31f32).to_radians(), -5.799903);
@@ -1558,40 +1552,40 @@ mod tests {
     fn test_ldexp() {
         // We have to use from_str until base-2 exponents
         // are supported in floating-point literals
-        let f1: f32 = FromStrRadix::from_str_radix("1p-123", 16).unwrap();
-        let f2: f32 = FromStrRadix::from_str_radix("1p-111", 16).unwrap();
-        let f3: f32 = FromStrRadix::from_str_radix("1.Cp-12", 16).unwrap();
-        assert_eq!(1f32.ldexp(-123), f1);
-        assert_eq!(1f32.ldexp(-111), f2);
-        assert_eq!(Float::ldexp(1.75f32, -12), f3);
+        let f1: f32 = f32::from_str_radix("1p-123", 16).unwrap();
+        let f2: f32 = f32::from_str_radix("1p-111", 16).unwrap();
+        let f3: f32 = f32::from_str_radix("1.Cp-12", 16).unwrap();
+        assert_eq!(f32::ldexp(1f32, -123), f1);
+        assert_eq!(f32::ldexp(1f32, -111), f2);
+        assert_eq!(f32::ldexp(1.75f32, -12), f3);
 
-        assert_eq!(Float::ldexp(0f32, -123), 0f32);
-        assert_eq!(Float::ldexp(-0f32, -123), -0f32);
+        assert_eq!(f32::ldexp(0f32, -123), 0f32);
+        assert_eq!(f32::ldexp(-0f32, -123), -0f32);
 
-        let inf: f32 = Float::infinity();
-        let neg_inf: f32 = Float::neg_infinity();
-        let nan: f32 = Float::nan();
-        assert_eq!(Float::ldexp(inf, -123), inf);
-        assert_eq!(Float::ldexp(neg_inf, -123), neg_inf);
-        assert!(Float::ldexp(nan, -123).is_nan());
+        let inf: f32 = f32::INFINITY;
+        let neg_inf: f32 = f32::NEG_INFINITY;
+        let nan: f32 = f32::NAN;
+        assert_eq!(f32::ldexp(inf, -123), inf);
+        assert_eq!(f32::ldexp(neg_inf, -123), neg_inf);
+        assert!(f32::ldexp(nan, -123).is_nan());
     }
 
     #[test]
     fn test_frexp() {
         // We have to use from_str until base-2 exponents
         // are supported in floating-point literals
-        let f1: f32 = FromStrRadix::from_str_radix("1p-123", 16).unwrap();
-        let f2: f32 = FromStrRadix::from_str_radix("1p-111", 16).unwrap();
-        let f3: f32 = FromStrRadix::from_str_radix("1.Cp-123", 16).unwrap();
+        let f1: f32 = f32::from_str_radix("1p-123", 16).unwrap();
+        let f2: f32 = f32::from_str_radix("1p-111", 16).unwrap();
+        let f3: f32 = f32::from_str_radix("1.Cp-123", 16).unwrap();
         let (x1, exp1) = f1.frexp();
         let (x2, exp2) = f2.frexp();
         let (x3, exp3) = f3.frexp();
         assert_eq!((x1, exp1), (0.5f32, -122));
         assert_eq!((x2, exp2), (0.5f32, -110));
         assert_eq!((x3, exp3), (0.875f32, -122));
-        assert_eq!(Float::ldexp(x1, exp1), f1);
-        assert_eq!(Float::ldexp(x2, exp2), f2);
-        assert_eq!(Float::ldexp(x3, exp3), f3);
+        assert_eq!(f32::ldexp(x1, exp1), f1);
+        assert_eq!(f32::ldexp(x2, exp2), f2);
+        assert_eq!(f32::ldexp(x3, exp3), f3);
 
         assert_eq!(0f32.frexp(), (0f32, 0));
         assert_eq!((-0f32).frexp(), (-0f32, 0));
@@ -1599,9 +1593,9 @@ mod tests {
 
     #[test] #[cfg_attr(windows, ignore)] // FIXME #8755
     fn test_frexp_nowin() {
-        let inf: f32 = Float::infinity();
-        let neg_inf: f32 = Float::neg_infinity();
-        let nan: f32 = Float::nan();
+        let inf: f32 = f32::INFINITY;
+        let neg_inf: f32 = f32::NEG_INFINITY;
+        let nan: f32 = f32::NAN;
         assert_eq!(match inf.frexp() { (x, _) => x }, inf);
         assert_eq!(match neg_inf.frexp() { (x, _) => x }, neg_inf);
         assert!(match nan.frexp() { (x, _) => x.is_nan() })
@@ -1630,9 +1624,9 @@ mod tests {
         assert_eq!(0.0f32.asinh(), 0.0f32);
         assert_eq!((-0.0f32).asinh(), -0.0f32);
 
-        let inf: f32 = Float::infinity();
-        let neg_inf: f32 = Float::neg_infinity();
-        let nan: f32 = Float::nan();
+        let inf: f32 = f32::INFINITY;
+        let neg_inf: f32 = f32::NEG_INFINITY;
+        let nan: f32 = f32::NAN;
         assert_eq!(inf.asinh(), inf);
         assert_eq!(neg_inf.asinh(), neg_inf);
         assert!(nan.asinh().is_nan());
@@ -1645,9 +1639,9 @@ mod tests {
         assert_eq!(1.0f32.acosh(), 0.0f32);
         assert!(0.999f32.acosh().is_nan());
 
-        let inf: f32 = Float::infinity();
-        let neg_inf: f32 = Float::neg_infinity();
-        let nan: f32 = Float::nan();
+        let inf: f32 = f32::INFINITY;
+        let neg_inf: f32 = f32::NEG_INFINITY;
+        let nan: f32 = f32::NAN;
         assert_eq!(inf.acosh(), inf);
         assert!(neg_inf.acosh().is_nan());
         assert!(nan.acosh().is_nan());
@@ -1660,17 +1654,17 @@ mod tests {
         assert_eq!(0.0f32.atanh(), 0.0f32);
         assert_eq!((-0.0f32).atanh(), -0.0f32);
 
-        let inf32: f32 = Float::infinity();
-        let neg_inf32: f32 = Float::neg_infinity();
+        let inf32: f32 = f32::INFINITY;
+        let neg_inf32: f32 = f32::NEG_INFINITY;
         assert_eq!(1.0f32.atanh(), inf32);
         assert_eq!((-1.0f32).atanh(), neg_inf32);
 
         assert!(2f64.atanh().atanh().is_nan());
         assert!((-2f64).atanh().atanh().is_nan());
 
-        let inf64: f32 = Float::infinity();
-        let neg_inf64: f32 = Float::neg_infinity();
-        let nan32: f32 = Float::nan();
+        let inf64: f32 = f32::INFINITY;
+        let neg_inf64: f32 = f32::NEG_INFINITY;
+        let nan32: f32 = f32::NAN;
         assert!(inf64.atanh().is_nan());
         assert!(neg_inf64.atanh().is_nan());
         assert!(nan32.atanh().is_nan());
@@ -1692,9 +1686,9 @@ mod tests {
         let frac_pi_8: f32 = consts::FRAC_PI_8;
         let frac_1_pi: f32 = consts::FRAC_1_PI;
         let frac_2_pi: f32 = consts::FRAC_2_PI;
-        let frac_2_sqrtpi: f32 = consts::FRAC_2_SQRTPI;
-        let sqrt2: f32 = consts::SQRT2;
-        let frac_1_sqrt2: f32 = consts::FRAC_1_SQRT2;
+        let frac_2_sqrtpi: f32 = consts::FRAC_2_SQRT_PI;
+        let sqrt2: f32 = consts::SQRT_2;
+        let frac_1_sqrt2: f32 = consts::FRAC_1_SQRT_2;
         let e: f32 = consts::E;
         let log2_e: f32 = consts::LOG2_E;
         let log10_e: f32 = consts::LOG10_E;
diff --git a/src/libstd/num/f64.rs b/src/libstd/num/f64.rs
index bd50a087c71..e1497f3958d 100644
--- a/src/libstd/num/f64.rs
+++ b/src/libstd/num/f64.rs
@@ -14,11 +14,13 @@
 #![allow(missing_docs)]
 #![doc(primitive = "f64")]
 
-use intrinsics;
-use libc::c_int;
-use num::FpCategory;
+use prelude::v1::*;
 
 use core::num;
+use intrinsics;
+use libc::c_int;
+use num::{FpCategory, ParseFloatError};
+use sys_common::FromInner;
 
 pub use core::f64::{RADIX, MANTISSA_DIGITS, DIGITS, EPSILON};
 pub use core::f64::{MIN_EXP, MAX_EXP, MIN_10_EXP};
@@ -80,6 +82,12 @@ mod cmath {
 #[lang = "f64"]
 #[stable(feature = "rust1", since = "1.0.0")]
 impl f64 {
+    /// Parses a float as with a given radix
+    #[unstable(feature = "float_from_str_radix", reason = "recently moved API")]
+    pub fn from_str_radix(s: &str, radix: u32) -> Result<f64, ParseFloatError> {
+        num::Float::from_str_radix(s, radix).map_err(FromInner::from_inner)
+    }
+
     /// Returns `true` if this value is `NaN` and false otherwise.
     ///
     /// ```
@@ -435,22 +443,6 @@ impl f64 {
     #[inline]
     pub fn sqrt(self) -> f64 { num::Float::sqrt(self) }
 
-    /// Takes the reciprocal (inverse) square root of a number, `1/sqrt(x)`.
-    ///
-    /// ```
-    /// # #![feature(std_misc)]
-    /// let f = 4.0_f64;
-    ///
-    /// let abs_difference = (f.rsqrt() - 0.5).abs();
-    ///
-    /// assert!(abs_difference < 1e-10);
-    /// ```
-    #[unstable(feature = "std_misc",
-               reason = "unsure about its place in the world")]
-    #[deprecated(since = "1.0.0", reason = "use self.sqrt().recip() instead")]
-    #[inline]
-    pub fn rsqrt(self) -> f64 { num::Float::rsqrt(self) }
-
     /// Returns `e^(self)`, (the exponential function).
     ///
     /// ```
@@ -1013,7 +1005,7 @@ impl f64 {
     #[inline]
     pub fn acosh(self) -> f64 {
         match self {
-            x if x < 1.0 => num::Float::nan(),
+            x if x < 1.0 => NAN,
             x => (x + ((x * x) - 1.0).sqrt()).ln(),
         }
     }
@@ -1039,6 +1031,7 @@ impl f64 {
 
 #[cfg(test)]
 mod tests {
+    use f64;
     use f64::*;
     use num::*;
     use num::FpCategory as Fp;
@@ -1062,7 +1055,7 @@ mod tests {
 
     #[test]
     fn test_nan() {
-        let nan: f64 = Float::nan();
+        let nan: f64 = NAN;
         assert!(nan.is_nan());
         assert!(!nan.is_infinite());
         assert!(!nan.is_finite());
@@ -1074,7 +1067,7 @@ mod tests {
 
     #[test]
     fn test_infinity() {
-        let inf: f64 = Float::infinity();
+        let inf: f64 = INFINITY;
         assert!(inf.is_infinite());
         assert!(!inf.is_finite());
         assert!(inf.is_sign_positive());
@@ -1086,7 +1079,7 @@ mod tests {
 
     #[test]
     fn test_neg_infinity() {
-        let neg_inf: f64 = Float::neg_infinity();
+        let neg_inf: f64 = NEG_INFINITY;
         assert!(neg_inf.is_infinite());
         assert!(!neg_inf.is_finite());
         assert!(!neg_inf.is_sign_positive());
@@ -1098,7 +1091,7 @@ mod tests {
 
     #[test]
     fn test_zero() {
-        let zero: f64 = Float::zero();
+        let zero: f64 = 0.0f64;
         assert_eq!(0.0, zero);
         assert!(!zero.is_infinite());
         assert!(zero.is_finite());
@@ -1111,7 +1104,7 @@ mod tests {
 
     #[test]
     fn test_neg_zero() {
-        let neg_zero: f64 = Float::neg_zero();
+        let neg_zero: f64 = -0.0;
         assert_eq!(0.0, neg_zero);
         assert!(!neg_zero.is_infinite());
         assert!(neg_zero.is_finite());
@@ -1124,7 +1117,7 @@ mod tests {
 
     #[test]
     fn test_one() {
-        let one: f64 = Float::one();
+        let one: f64 = 1.0f64;
         assert_eq!(1.0, one);
         assert!(!one.is_infinite());
         assert!(one.is_finite());
@@ -1137,9 +1130,9 @@ mod tests {
 
     #[test]
     fn test_is_nan() {
-        let nan: f64 = Float::nan();
-        let inf: f64 = Float::infinity();
-        let neg_inf: f64 = Float::neg_infinity();
+        let nan: f64 = NAN;
+        let inf: f64 = INFINITY;
+        let neg_inf: f64 = NEG_INFINITY;
         assert!(nan.is_nan());
         assert!(!0.0f64.is_nan());
         assert!(!5.3f64.is_nan());
@@ -1150,9 +1143,9 @@ mod tests {
 
     #[test]
     fn test_is_infinite() {
-        let nan: f64 = Float::nan();
-        let inf: f64 = Float::infinity();
-        let neg_inf: f64 = Float::neg_infinity();
+        let nan: f64 = NAN;
+        let inf: f64 = INFINITY;
+        let neg_inf: f64 = NEG_INFINITY;
         assert!(!nan.is_infinite());
         assert!(inf.is_infinite());
         assert!(neg_inf.is_infinite());
@@ -1163,9 +1156,9 @@ mod tests {
 
     #[test]
     fn test_is_finite() {
-        let nan: f64 = Float::nan();
-        let inf: f64 = Float::infinity();
-        let neg_inf: f64 = Float::neg_infinity();
+        let nan: f64 = NAN;
+        let inf: f64 = INFINITY;
+        let neg_inf: f64 = NEG_INFINITY;
         assert!(!nan.is_finite());
         assert!(!inf.is_finite());
         assert!(!neg_inf.is_finite());
@@ -1176,11 +1169,11 @@ mod tests {
 
     #[test]
     fn test_is_normal() {
-        let nan: f64 = Float::nan();
-        let inf: f64 = Float::infinity();
-        let neg_inf: f64 = Float::neg_infinity();
-        let zero: f64 = Float::zero();
-        let neg_zero: f64 = Float::neg_zero();
+        let nan: f64 = NAN;
+        let inf: f64 = INFINITY;
+        let neg_inf: f64 = NEG_INFINITY;
+        let zero: f64 = 0.0f64;
+        let neg_zero: f64 = -0.0;
         assert!(!nan.is_normal());
         assert!(!inf.is_normal());
         assert!(!neg_inf.is_normal());
@@ -1193,11 +1186,11 @@ mod tests {
 
     #[test]
     fn test_classify() {
-        let nan: f64 = Float::nan();
-        let inf: f64 = Float::infinity();
-        let neg_inf: f64 = Float::neg_infinity();
-        let zero: f64 = Float::zero();
-        let neg_zero: f64 = Float::neg_zero();
+        let nan: f64 = NAN;
+        let inf: f64 = INFINITY;
+        let neg_inf: f64 = NEG_INFINITY;
+        let zero: f64 = 0.0f64;
+        let neg_zero: f64 = -0.0;
         assert_eq!(nan.classify(), Fp::Nan);
         assert_eq!(inf.classify(), Fp::Infinite);
         assert_eq!(neg_inf.classify(), Fp::Infinite);
@@ -1339,9 +1332,9 @@ mod tests {
 
     #[test]
     fn test_mul_add() {
-        let nan: f64 = Float::nan();
-        let inf: f64 = Float::infinity();
-        let neg_inf: f64 = Float::neg_infinity();
+        let nan: f64 = NAN;
+        let inf: f64 = INFINITY;
+        let neg_inf: f64 = NEG_INFINITY;
         assert_approx_eq!(12.3f64.mul_add(4.5, 6.7), 62.05);
         assert_approx_eq!((-12.3f64).mul_add(-4.5, -6.7), 48.65);
         assert_approx_eq!(0.0f64.mul_add(8.9, 1.2), 1.2);
@@ -1355,9 +1348,9 @@ mod tests {
 
     #[test]
     fn test_recip() {
-        let nan: f64 = Float::nan();
-        let inf: f64 = Float::infinity();
-        let neg_inf: f64 = Float::neg_infinity();
+        let nan: f64 = NAN;
+        let inf: f64 = INFINITY;
+        let neg_inf: f64 = NEG_INFINITY;
         assert_eq!(1.0f64.recip(), 1.0);
         assert_eq!(2.0f64.recip(), 0.5);
         assert_eq!((-0.4f64).recip(), -2.5);
@@ -1369,9 +1362,9 @@ mod tests {
 
     #[test]
     fn test_powi() {
-        let nan: f64 = Float::nan();
-        let inf: f64 = Float::infinity();
-        let neg_inf: f64 = Float::neg_infinity();
+        let nan: f64 = NAN;
+        let inf: f64 = INFINITY;
+        let neg_inf: f64 = NEG_INFINITY;
         assert_eq!(1.0f64.powi(1), 1.0);
         assert_approx_eq!((-3.1f64).powi(2), 9.61);
         assert_approx_eq!(5.9f64.powi(-2), 0.028727);
@@ -1383,9 +1376,9 @@ mod tests {
 
     #[test]
     fn test_powf() {
-        let nan: f64 = Float::nan();
-        let inf: f64 = Float::infinity();
-        let neg_inf: f64 = Float::neg_infinity();
+        let nan: f64 = NAN;
+        let inf: f64 = INFINITY;
+        let neg_inf: f64 = NEG_INFINITY;
         assert_eq!(1.0f64.powf(1.0), 1.0);
         assert_approx_eq!(3.4f64.powf(4.5), 246.408183);
         assert_approx_eq!(2.7f64.powf(-3.2), 0.041652);
@@ -1409,29 +1402,14 @@ mod tests {
     }
 
     #[test]
-    fn test_rsqrt() {
-        let nan: f64 = Float::nan();
-        let inf: f64 = Float::infinity();
-        let neg_inf: f64 = Float::neg_infinity();
-        assert!(nan.rsqrt().is_nan());
-        assert_eq!(inf.rsqrt(), 0.0);
-        assert!(neg_inf.rsqrt().is_nan());
-        assert!((-1.0f64).rsqrt().is_nan());
-        assert_eq!((-0.0f64).rsqrt(), neg_inf);
-        assert_eq!(0.0f64.rsqrt(), inf);
-        assert_eq!(1.0f64.rsqrt(), 1.0);
-        assert_eq!(4.0f64.rsqrt(), 0.5);
-    }
-
-    #[test]
     fn test_exp() {
         assert_eq!(1.0, 0.0f64.exp());
         assert_approx_eq!(2.718282, 1.0f64.exp());
         assert_approx_eq!(148.413159, 5.0f64.exp());
 
-        let inf: f64 = Float::infinity();
-        let neg_inf: f64 = Float::neg_infinity();
-        let nan: f64 = Float::nan();
+        let inf: f64 = INFINITY;
+        let neg_inf: f64 = NEG_INFINITY;
+        let nan: f64 = NAN;
         assert_eq!(inf, inf.exp());
         assert_eq!(0.0, neg_inf.exp());
         assert!(nan.exp().is_nan());
@@ -1442,9 +1420,9 @@ mod tests {
         assert_eq!(32.0, 5.0f64.exp2());
         assert_eq!(1.0, 0.0f64.exp2());
 
-        let inf: f64 = Float::infinity();
-        let neg_inf: f64 = Float::neg_infinity();
-        let nan: f64 = Float::nan();
+        let inf: f64 = INFINITY;
+        let neg_inf: f64 = NEG_INFINITY;
+        let nan: f64 = NAN;
         assert_eq!(inf, inf.exp2());
         assert_eq!(0.0, neg_inf.exp2());
         assert!(nan.exp2().is_nan());
@@ -1452,9 +1430,9 @@ mod tests {
 
     #[test]
     fn test_ln() {
-        let nan: f64 = Float::nan();
-        let inf: f64 = Float::infinity();
-        let neg_inf: f64 = Float::neg_infinity();
+        let nan: f64 = NAN;
+        let inf: f64 = INFINITY;
+        let neg_inf: f64 = NEG_INFINITY;
         assert_approx_eq!(1.0f64.exp().ln(), 1.0);
         assert!(nan.ln().is_nan());
         assert_eq!(inf.ln(), inf);
@@ -1467,12 +1445,12 @@ mod tests {
 
     #[test]
     fn test_log() {
-        let nan: f64 = Float::nan();
-        let inf: f64 = Float::infinity();
-        let neg_inf: f64 = Float::neg_infinity();
+        let nan: f64 = NAN;
+        let inf: f64 = INFINITY;
+        let neg_inf: f64 = NEG_INFINITY;
         assert_eq!(10.0f64.log(10.0), 1.0);
         assert_approx_eq!(2.3f64.log(3.5), 0.664858);
-        assert_eq!(1.0f64.exp().log(1.0.exp()), 1.0);
+        assert_eq!(1.0f64.exp().log(1.0f64.exp()), 1.0);
         assert!(1.0f64.log(1.0).is_nan());
         assert!(1.0f64.log(-13.9).is_nan());
         assert!(nan.log(2.3).is_nan());
@@ -1485,9 +1463,9 @@ mod tests {
 
     #[test]
     fn test_log2() {
-        let nan: f64 = Float::nan();
-        let inf: f64 = Float::infinity();
-        let neg_inf: f64 = Float::neg_infinity();
+        let nan: f64 = NAN;
+        let inf: f64 = INFINITY;
+        let neg_inf: f64 = NEG_INFINITY;
         assert_approx_eq!(10.0f64.log2(), 3.321928);
         assert_approx_eq!(2.3f64.log2(), 1.201634);
         assert_approx_eq!(1.0f64.exp().log2(), 1.442695);
@@ -1501,9 +1479,9 @@ mod tests {
 
     #[test]
     fn test_log10() {
-        let nan: f64 = Float::nan();
-        let inf: f64 = Float::infinity();
-        let neg_inf: f64 = Float::neg_infinity();
+        let nan: f64 = NAN;
+        let inf: f64 = INFINITY;
+        let neg_inf: f64 = NEG_INFINITY;
         assert_eq!(10.0f64.log10(), 1.0);
         assert_approx_eq!(2.3f64.log10(), 0.361728);
         assert_approx_eq!(1.0f64.exp().log10(), 0.434294);
@@ -1519,9 +1497,9 @@ mod tests {
     #[test]
     fn test_to_degrees() {
         let pi: f64 = consts::PI;
-        let nan: f64 = Float::nan();
-        let inf: f64 = Float::infinity();
-        let neg_inf: f64 = Float::neg_infinity();
+        let nan: f64 = NAN;
+        let inf: f64 = INFINITY;
+        let neg_inf: f64 = NEG_INFINITY;
         assert_eq!(0.0f64.to_degrees(), 0.0);
         assert_approx_eq!((-5.8f64).to_degrees(), -332.315521);
         assert_eq!(pi.to_degrees(), 180.0);
@@ -1533,9 +1511,9 @@ mod tests {
     #[test]
     fn test_to_radians() {
         let pi: f64 = consts::PI;
-        let nan: f64 = Float::nan();
-        let inf: f64 = Float::infinity();
-        let neg_inf: f64 = Float::neg_infinity();
+        let nan: f64 = NAN;
+        let inf: f64 = INFINITY;
+        let neg_inf: f64 = NEG_INFINITY;
         assert_eq!(0.0f64.to_radians(), 0.0);
         assert_approx_eq!(154.6f64.to_radians(), 2.698279);
         assert_approx_eq!((-332.31f64).to_radians(), -5.799903);
@@ -1549,40 +1527,40 @@ mod tests {
     fn test_ldexp() {
         // We have to use from_str until base-2 exponents
         // are supported in floating-point literals
-        let f1: f64 = FromStrRadix::from_str_radix("1p-123", 16).unwrap();
-        let f2: f64 = FromStrRadix::from_str_radix("1p-111", 16).unwrap();
-        let f3: f64 = FromStrRadix::from_str_radix("1.Cp-12", 16).unwrap();
-        assert_eq!(1f64.ldexp(-123), f1);
-        assert_eq!(1f64.ldexp(-111), f2);
-        assert_eq!(Float::ldexp(1.75f64, -12), f3);
+        let f1: f64 = f64::from_str_radix("1p-123", 16).unwrap();
+        let f2: f64 = f64::from_str_radix("1p-111", 16).unwrap();
+        let f3: f64 = f64::from_str_radix("1.Cp-12", 16).unwrap();
+        assert_eq!(f64::ldexp(1f64, -123), f1);
+        assert_eq!(f64::ldexp(1f64, -111), f2);
+        assert_eq!(f64::ldexp(1.75f64, -12), f3);
 
-        assert_eq!(Float::ldexp(0f64, -123), 0f64);
-        assert_eq!(Float::ldexp(-0f64, -123), -0f64);
+        assert_eq!(f64::ldexp(0f64, -123), 0f64);
+        assert_eq!(f64::ldexp(-0f64, -123), -0f64);
 
-        let inf: f64 = Float::infinity();
-        let neg_inf: f64 = Float::neg_infinity();
-        let nan: f64 = Float::nan();
-        assert_eq!(Float::ldexp(inf, -123), inf);
-        assert_eq!(Float::ldexp(neg_inf, -123), neg_inf);
-        assert!(Float::ldexp(nan, -123).is_nan());
+        let inf: f64 = INFINITY;
+        let neg_inf: f64 = NEG_INFINITY;
+        let nan: f64 = NAN;
+        assert_eq!(f64::ldexp(inf, -123), inf);
+        assert_eq!(f64::ldexp(neg_inf, -123), neg_inf);
+        assert!(f64::ldexp(nan, -123).is_nan());
     }
 
     #[test]
     fn test_frexp() {
         // We have to use from_str until base-2 exponents
         // are supported in floating-point literals
-        let f1: f64 = FromStrRadix::from_str_radix("1p-123", 16).unwrap();
-        let f2: f64 = FromStrRadix::from_str_radix("1p-111", 16).unwrap();
-        let f3: f64 = FromStrRadix::from_str_radix("1.Cp-123", 16).unwrap();
+        let f1: f64 = f64::from_str_radix("1p-123", 16).unwrap();
+        let f2: f64 = f64::from_str_radix("1p-111", 16).unwrap();
+        let f3: f64 = f64::from_str_radix("1.Cp-123", 16).unwrap();
         let (x1, exp1) = f1.frexp();
         let (x2, exp2) = f2.frexp();
         let (x3, exp3) = f3.frexp();
         assert_eq!((x1, exp1), (0.5f64, -122));
         assert_eq!((x2, exp2), (0.5f64, -110));
         assert_eq!((x3, exp3), (0.875f64, -122));
-        assert_eq!(Float::ldexp(x1, exp1), f1);
-        assert_eq!(Float::ldexp(x2, exp2), f2);
-        assert_eq!(Float::ldexp(x3, exp3), f3);
+        assert_eq!(f64::ldexp(x1, exp1), f1);
+        assert_eq!(f64::ldexp(x2, exp2), f2);
+        assert_eq!(f64::ldexp(x3, exp3), f3);
 
         assert_eq!(0f64.frexp(), (0f64, 0));
         assert_eq!((-0f64).frexp(), (-0f64, 0));
@@ -1590,9 +1568,9 @@ mod tests {
 
     #[test] #[cfg_attr(windows, ignore)] // FIXME #8755
     fn test_frexp_nowin() {
-        let inf: f64 = Float::infinity();
-        let neg_inf: f64 = Float::neg_infinity();
-        let nan: f64 = Float::nan();
+        let inf: f64 = INFINITY;
+        let neg_inf: f64 = NEG_INFINITY;
+        let nan: f64 = NAN;
         assert_eq!(match inf.frexp() { (x, _) => x }, inf);
         assert_eq!(match neg_inf.frexp() { (x, _) => x }, neg_inf);
         assert!(match nan.frexp() { (x, _) => x.is_nan() })
@@ -1621,9 +1599,9 @@ mod tests {
         assert_eq!(0.0f64.asinh(), 0.0f64);
         assert_eq!((-0.0f64).asinh(), -0.0f64);
 
-        let inf: f64 = Float::infinity();
-        let neg_inf: f64 = Float::neg_infinity();
-        let nan: f64 = Float::nan();
+        let inf: f64 = INFINITY;
+        let neg_inf: f64 = NEG_INFINITY;
+        let nan: f64 = NAN;
         assert_eq!(inf.asinh(), inf);
         assert_eq!(neg_inf.asinh(), neg_inf);
         assert!(nan.asinh().is_nan());
@@ -1636,9 +1614,9 @@ mod tests {
         assert_eq!(1.0f64.acosh(), 0.0f64);
         assert!(0.999f64.acosh().is_nan());
 
-        let inf: f64 = Float::infinity();
-        let neg_inf: f64 = Float::neg_infinity();
-        let nan: f64 = Float::nan();
+        let inf: f64 = INFINITY;
+        let neg_inf: f64 = NEG_INFINITY;
+        let nan: f64 = NAN;
         assert_eq!(inf.acosh(), inf);
         assert!(neg_inf.acosh().is_nan());
         assert!(nan.acosh().is_nan());
@@ -1651,9 +1629,9 @@ mod tests {
         assert_eq!(0.0f64.atanh(), 0.0f64);
         assert_eq!((-0.0f64).atanh(), -0.0f64);
 
-        let inf: f64 = Float::infinity();
-        let neg_inf: f64 = Float::neg_infinity();
-        let nan: f64 = Float::nan();
+        let inf: f64 = INFINITY;
+        let neg_inf: f64 = NEG_INFINITY;
+        let nan: f64 = NAN;
         assert_eq!(1.0f64.atanh(), inf);
         assert_eq!((-1.0f64).atanh(), neg_inf);
         assert!(2f64.atanh().atanh().is_nan());
@@ -1677,9 +1655,9 @@ mod tests {
         let frac_pi_8: f64 = consts::FRAC_PI_8;
         let frac_1_pi: f64 = consts::FRAC_1_PI;
         let frac_2_pi: f64 = consts::FRAC_2_PI;
-        let frac_2_sqrtpi: f64 = consts::FRAC_2_SQRTPI;
-        let sqrt2: f64 = consts::SQRT2;
-        let frac_1_sqrt2: f64 = consts::FRAC_1_SQRT2;
+        let frac_2_sqrtpi: f64 = consts::FRAC_2_SQRT_PI;
+        let sqrt2: f64 = consts::SQRT_2;
+        let frac_1_sqrt2: f64 = consts::FRAC_1_SQRT_2;
         let e: f64 = consts::E;
         let log2_e: f64 = consts::LOG2_E;
         let log10_e: f64 = consts::LOG10_E;
diff --git a/src/libstd/num/mod.rs b/src/libstd/num/mod.rs
index dbe06b77329..cd26be013c4 100644
--- a/src/libstd/num/mod.rs
+++ b/src/libstd/num/mod.rs
@@ -16,27 +16,26 @@
 #![stable(feature = "rust1", since = "1.0.0")]
 #![allow(missing_docs)]
 
-#[cfg(test)] use fmt::Debug;
+use fmt;
+use core::num;
 
 pub use core::num::{Zero, One};
-pub use core::num::{FpCategory, ParseIntError, ParseFloatError};
+pub use core::num::{FpCategory, ParseIntError};
 pub use core::num::{wrapping, Wrapping};
 
+#[cfg(test)] use ops::{Add, Sub, Mul, Div, Rem};
+#[cfg(test)] use cmp::PartialEq;
+#[cfg(test)] use marker::Copy;
+
 /// Helper function for testing numeric operations
 #[cfg(test)]
 pub fn test_num<T>(ten: T, two: T) where
-    T: PartialEq + NumCast
+    T: PartialEq
      + Add<Output=T> + Sub<Output=T>
      + Mul<Output=T> + Div<Output=T>
-     + Rem<Output=T> + Debug
+     + Rem<Output=T> + fmt::Debug
      + Copy
 {
-    assert_eq!(ten.add(two),  cast(12).unwrap());
-    assert_eq!(ten.sub(two),  cast(8).unwrap());
-    assert_eq!(ten.mul(two),  cast(20).unwrap());
-    assert_eq!(ten.div(two),  cast(5).unwrap());
-    assert_eq!(ten.rem(two),  cast(0).unwrap());
-
     assert_eq!(ten.add(two),  ten + two);
     assert_eq!(ten.sub(two),  ten - two);
     assert_eq!(ten.mul(two),  ten * two);
@@ -44,6 +43,31 @@ pub fn test_num<T>(ten: T, two: T) where
     assert_eq!(ten.rem(two),  ten % two);
 }
 
+/// An error which can be returned when parsing a float.
+#[derive(Debug, Clone, PartialEq)]
+#[stable(feature = "rust1", since = "1.0.0")]
+pub struct ParseFloatError { inner: num::ParseFloatError }
+
+impl ::sys_common::FromInner<num::ParseFloatError> for ParseFloatError {
+    fn from_inner(inner: num::ParseFloatError) -> ParseFloatError {
+        ParseFloatError { inner: inner }
+    }
+}
+
+impl ParseFloatError {
+    #[unstable(feature = "core", reason = "available through Error trait")]
+    pub fn description(&self) -> &str {
+        self.inner.description()
+    }
+}
+
+#[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)
+    }
+}
+
 #[cfg(test)]
 mod tests {
     use core::prelude::*;
@@ -59,432 +83,7 @@ mod tests {
     use u64;
     use usize;
     use string::ToString;
-
-    macro_rules! test_cast_20 {
-        ($_20:expr) => ({
-            let _20 = $_20;
-
-            assert_eq!(20usize, _20.to_uint().unwrap());
-            assert_eq!(20u8,    _20.to_u8().unwrap());
-            assert_eq!(20u16,   _20.to_u16().unwrap());
-            assert_eq!(20u32,   _20.to_u32().unwrap());
-            assert_eq!(20u64,   _20.to_u64().unwrap());
-            assert_eq!(20,      _20.to_int().unwrap());
-            assert_eq!(20i8,    _20.to_i8().unwrap());
-            assert_eq!(20i16,   _20.to_i16().unwrap());
-            assert_eq!(20i32,   _20.to_i32().unwrap());
-            assert_eq!(20i64,   _20.to_i64().unwrap());
-            assert_eq!(20f32,   _20.to_f32().unwrap());
-            assert_eq!(20f64,   _20.to_f64().unwrap());
-
-            assert_eq!(_20, NumCast::from(20usize).unwrap());
-            assert_eq!(_20, NumCast::from(20u8).unwrap());
-            assert_eq!(_20, NumCast::from(20u16).unwrap());
-            assert_eq!(_20, NumCast::from(20u32).unwrap());
-            assert_eq!(_20, NumCast::from(20u64).unwrap());
-            assert_eq!(_20, NumCast::from(20).unwrap());
-            assert_eq!(_20, NumCast::from(20i8).unwrap());
-            assert_eq!(_20, NumCast::from(20i16).unwrap());
-            assert_eq!(_20, NumCast::from(20i32).unwrap());
-            assert_eq!(_20, NumCast::from(20i64).unwrap());
-            assert_eq!(_20, NumCast::from(20f32).unwrap());
-            assert_eq!(_20, NumCast::from(20f64).unwrap());
-
-            assert_eq!(_20, cast(20usize).unwrap());
-            assert_eq!(_20, cast(20u8).unwrap());
-            assert_eq!(_20, cast(20u16).unwrap());
-            assert_eq!(_20, cast(20u32).unwrap());
-            assert_eq!(_20, cast(20u64).unwrap());
-            assert_eq!(_20, cast(20).unwrap());
-            assert_eq!(_20, cast(20i8).unwrap());
-            assert_eq!(_20, cast(20i16).unwrap());
-            assert_eq!(_20, cast(20i32).unwrap());
-            assert_eq!(_20, cast(20i64).unwrap());
-            assert_eq!(_20, cast(20f32).unwrap());
-            assert_eq!(_20, cast(20f64).unwrap());
-        })
-    }
-
-    #[test] fn test_u8_cast()    { test_cast_20!(20u8)    }
-    #[test] fn test_u16_cast()   { test_cast_20!(20u16)   }
-    #[test] fn test_u32_cast()   { test_cast_20!(20u32)   }
-    #[test] fn test_u64_cast()   { test_cast_20!(20u64)   }
-    #[test] fn test_uint_cast()  { test_cast_20!(20usize) }
-    #[test] fn test_i8_cast()    { test_cast_20!(20i8)    }
-    #[test] fn test_i16_cast()   { test_cast_20!(20i16)   }
-    #[test] fn test_i32_cast()   { test_cast_20!(20i32)   }
-    #[test] fn test_i64_cast()   { test_cast_20!(20i64)   }
-    #[test] fn test_int_cast()   { test_cast_20!(20)      }
-    #[test] fn test_f32_cast()   { test_cast_20!(20f32)   }
-    #[test] fn test_f64_cast()   { test_cast_20!(20f64)   }
-
-    #[test]
-    fn test_cast_range_int_min() {
-        assert_eq!(isize::MIN.to_int(),  Some(isize::MIN as isize));
-        assert_eq!(isize::MIN.to_i8(),   None);
-        assert_eq!(isize::MIN.to_i16(),  None);
-        // isize::MIN.to_i32() is word-size specific
-        assert_eq!(isize::MIN.to_i64(),  Some(isize::MIN as i64));
-        assert_eq!(isize::MIN.to_uint(), None);
-        assert_eq!(isize::MIN.to_u8(),   None);
-        assert_eq!(isize::MIN.to_u16(),  None);
-        assert_eq!(isize::MIN.to_u32(),  None);
-        assert_eq!(isize::MIN.to_u64(),  None);
-
-        #[cfg(target_pointer_width = "32")]
-        fn check_word_size() {
-            assert_eq!(isize::MIN.to_i32(), Some(isize::MIN as i32));
-        }
-
-        #[cfg(target_pointer_width = "64")]
-        fn check_word_size() {
-            assert_eq!(isize::MIN.to_i32(), None);
-        }
-
-        check_word_size();
-    }
-
-    #[test]
-    fn test_cast_range_i8_min() {
-        assert_eq!(i8::MIN.to_int(),  Some(i8::MIN as isize));
-        assert_eq!(i8::MIN.to_i8(),   Some(i8::MIN as i8));
-        assert_eq!(i8::MIN.to_i16(),  Some(i8::MIN as i16));
-        assert_eq!(i8::MIN.to_i32(),  Some(i8::MIN as i32));
-        assert_eq!(i8::MIN.to_i64(),  Some(i8::MIN as i64));
-        assert_eq!(i8::MIN.to_uint(), None);
-        assert_eq!(i8::MIN.to_u8(),   None);
-        assert_eq!(i8::MIN.to_u16(),  None);
-        assert_eq!(i8::MIN.to_u32(),  None);
-        assert_eq!(i8::MIN.to_u64(),  None);
-    }
-
-    #[test]
-    fn test_cast_range_i16_min() {
-        assert_eq!(i16::MIN.to_int(),  Some(i16::MIN as isize));
-        assert_eq!(i16::MIN.to_i8(),   None);
-        assert_eq!(i16::MIN.to_i16(),  Some(i16::MIN as i16));
-        assert_eq!(i16::MIN.to_i32(),  Some(i16::MIN as i32));
-        assert_eq!(i16::MIN.to_i64(),  Some(i16::MIN as i64));
-        assert_eq!(i16::MIN.to_uint(), None);
-        assert_eq!(i16::MIN.to_u8(),   None);
-        assert_eq!(i16::MIN.to_u16(),  None);
-        assert_eq!(i16::MIN.to_u32(),  None);
-        assert_eq!(i16::MIN.to_u64(),  None);
-    }
-
-    #[test]
-    fn test_cast_range_i32_min() {
-        assert_eq!(i32::MIN.to_int(),  Some(i32::MIN as isize));
-        assert_eq!(i32::MIN.to_i8(),   None);
-        assert_eq!(i32::MIN.to_i16(),  None);
-        assert_eq!(i32::MIN.to_i32(),  Some(i32::MIN as i32));
-        assert_eq!(i32::MIN.to_i64(),  Some(i32::MIN as i64));
-        assert_eq!(i32::MIN.to_uint(), None);
-        assert_eq!(i32::MIN.to_u8(),   None);
-        assert_eq!(i32::MIN.to_u16(),  None);
-        assert_eq!(i32::MIN.to_u32(),  None);
-        assert_eq!(i32::MIN.to_u64(),  None);
-    }
-
-    #[test]
-    fn test_cast_range_i64_min() {
-        // i64::MIN.to_int() is word-size specific
-        assert_eq!(i64::MIN.to_i8(),   None);
-        assert_eq!(i64::MIN.to_i16(),  None);
-        assert_eq!(i64::MIN.to_i32(),  None);
-        assert_eq!(i64::MIN.to_i64(),  Some(i64::MIN as i64));
-        assert_eq!(i64::MIN.to_uint(), None);
-        assert_eq!(i64::MIN.to_u8(),   None);
-        assert_eq!(i64::MIN.to_u16(),  None);
-        assert_eq!(i64::MIN.to_u32(),  None);
-        assert_eq!(i64::MIN.to_u64(),  None);
-
-        #[cfg(target_pointer_width = "32")]
-        fn check_word_size() {
-            assert_eq!(i64::MIN.to_int(), None);
-        }
-
-        #[cfg(target_pointer_width = "64")]
-        fn check_word_size() {
-            assert_eq!(i64::MIN.to_int(), Some(i64::MIN as isize));
-        }
-
-        check_word_size();
-    }
-
-    #[test]
-    fn test_cast_range_int_max() {
-        assert_eq!(isize::MAX.to_int(),  Some(isize::MAX as isize));
-        assert_eq!(isize::MAX.to_i8(),   None);
-        assert_eq!(isize::MAX.to_i16(),  None);
-        // isize::MAX.to_i32() is word-size specific
-        assert_eq!(isize::MAX.to_i64(),  Some(isize::MAX as i64));
-        assert_eq!(isize::MAX.to_u8(),   None);
-        assert_eq!(isize::MAX.to_u16(),  None);
-        // isize::MAX.to_u32() is word-size specific
-        assert_eq!(isize::MAX.to_u64(),  Some(isize::MAX as u64));
-
-        #[cfg(target_pointer_width = "32")]
-        fn check_word_size() {
-            assert_eq!(isize::MAX.to_i32(), Some(isize::MAX as i32));
-            assert_eq!(isize::MAX.to_u32(), Some(isize::MAX as u32));
-        }
-
-        #[cfg(target_pointer_width = "64")]
-        fn check_word_size() {
-            assert_eq!(isize::MAX.to_i32(), None);
-            assert_eq!(isize::MAX.to_u32(), None);
-        }
-
-        check_word_size();
-    }
-
-    #[test]
-    fn test_cast_range_i8_max() {
-        assert_eq!(i8::MAX.to_int(),  Some(i8::MAX as isize));
-        assert_eq!(i8::MAX.to_i8(),   Some(i8::MAX as i8));
-        assert_eq!(i8::MAX.to_i16(),  Some(i8::MAX as i16));
-        assert_eq!(i8::MAX.to_i32(),  Some(i8::MAX as i32));
-        assert_eq!(i8::MAX.to_i64(),  Some(i8::MAX as i64));
-        assert_eq!(i8::MAX.to_uint(), Some(i8::MAX as usize));
-        assert_eq!(i8::MAX.to_u8(),   Some(i8::MAX as u8));
-        assert_eq!(i8::MAX.to_u16(),  Some(i8::MAX as u16));
-        assert_eq!(i8::MAX.to_u32(),  Some(i8::MAX as u32));
-        assert_eq!(i8::MAX.to_u64(),  Some(i8::MAX as u64));
-    }
-
-    #[test]
-    fn test_cast_range_i16_max() {
-        assert_eq!(i16::MAX.to_int(),  Some(i16::MAX as isize));
-        assert_eq!(i16::MAX.to_i8(),   None);
-        assert_eq!(i16::MAX.to_i16(),  Some(i16::MAX as i16));
-        assert_eq!(i16::MAX.to_i32(),  Some(i16::MAX as i32));
-        assert_eq!(i16::MAX.to_i64(),  Some(i16::MAX as i64));
-        assert_eq!(i16::MAX.to_uint(), Some(i16::MAX as usize));
-        assert_eq!(i16::MAX.to_u8(),   None);
-        assert_eq!(i16::MAX.to_u16(),  Some(i16::MAX as u16));
-        assert_eq!(i16::MAX.to_u32(),  Some(i16::MAX as u32));
-        assert_eq!(i16::MAX.to_u64(),  Some(i16::MAX as u64));
-    }
-
-    #[test]
-    fn test_cast_range_i32_max() {
-        assert_eq!(i32::MAX.to_int(),  Some(i32::MAX as isize));
-        assert_eq!(i32::MAX.to_i8(),   None);
-        assert_eq!(i32::MAX.to_i16(),  None);
-        assert_eq!(i32::MAX.to_i32(),  Some(i32::MAX as i32));
-        assert_eq!(i32::MAX.to_i64(),  Some(i32::MAX as i64));
-        assert_eq!(i32::MAX.to_uint(), Some(i32::MAX as usize));
-        assert_eq!(i32::MAX.to_u8(),   None);
-        assert_eq!(i32::MAX.to_u16(),  None);
-        assert_eq!(i32::MAX.to_u32(),  Some(i32::MAX as u32));
-        assert_eq!(i32::MAX.to_u64(),  Some(i32::MAX as u64));
-    }
-
-    #[test]
-    fn test_cast_range_i64_max() {
-        // i64::MAX.to_int() is word-size specific
-        assert_eq!(i64::MAX.to_i8(),   None);
-        assert_eq!(i64::MAX.to_i16(),  None);
-        assert_eq!(i64::MAX.to_i32(),  None);
-        assert_eq!(i64::MAX.to_i64(),  Some(i64::MAX as i64));
-        // i64::MAX.to_uint() is word-size specific
-        assert_eq!(i64::MAX.to_u8(),   None);
-        assert_eq!(i64::MAX.to_u16(),  None);
-        assert_eq!(i64::MAX.to_u32(),  None);
-        assert_eq!(i64::MAX.to_u64(),  Some(i64::MAX as u64));
-
-        #[cfg(target_pointer_width = "32")]
-        fn check_word_size() {
-            assert_eq!(i64::MAX.to_int(),  None);
-            assert_eq!(i64::MAX.to_uint(), None);
-        }
-
-        #[cfg(target_pointer_width = "64")]
-        fn check_word_size() {
-            assert_eq!(i64::MAX.to_int(),  Some(i64::MAX as isize));
-            assert_eq!(i64::MAX.to_uint(), Some(i64::MAX as usize));
-        }
-
-        check_word_size();
-    }
-
-    #[test]
-    fn test_cast_range_uint_min() {
-        assert_eq!(usize::MIN.to_int(),  Some(usize::MIN as isize));
-        assert_eq!(usize::MIN.to_i8(),   Some(usize::MIN as i8));
-        assert_eq!(usize::MIN.to_i16(),  Some(usize::MIN as i16));
-        assert_eq!(usize::MIN.to_i32(),  Some(usize::MIN as i32));
-        assert_eq!(usize::MIN.to_i64(),  Some(usize::MIN as i64));
-        assert_eq!(usize::MIN.to_uint(), Some(usize::MIN as usize));
-        assert_eq!(usize::MIN.to_u8(),   Some(usize::MIN as u8));
-        assert_eq!(usize::MIN.to_u16(),  Some(usize::MIN as u16));
-        assert_eq!(usize::MIN.to_u32(),  Some(usize::MIN as u32));
-        assert_eq!(usize::MIN.to_u64(),  Some(usize::MIN as u64));
-    }
-
-    #[test]
-    fn test_cast_range_u8_min() {
-        assert_eq!(u8::MIN.to_int(),  Some(u8::MIN as isize));
-        assert_eq!(u8::MIN.to_i8(),   Some(u8::MIN as i8));
-        assert_eq!(u8::MIN.to_i16(),  Some(u8::MIN as i16));
-        assert_eq!(u8::MIN.to_i32(),  Some(u8::MIN as i32));
-        assert_eq!(u8::MIN.to_i64(),  Some(u8::MIN as i64));
-        assert_eq!(u8::MIN.to_uint(), Some(u8::MIN as usize));
-        assert_eq!(u8::MIN.to_u8(),   Some(u8::MIN as u8));
-        assert_eq!(u8::MIN.to_u16(),  Some(u8::MIN as u16));
-        assert_eq!(u8::MIN.to_u32(),  Some(u8::MIN as u32));
-        assert_eq!(u8::MIN.to_u64(),  Some(u8::MIN as u64));
-    }
-
-    #[test]
-    fn test_cast_range_u16_min() {
-        assert_eq!(u16::MIN.to_int(),  Some(u16::MIN as isize));
-        assert_eq!(u16::MIN.to_i8(),   Some(u16::MIN as i8));
-        assert_eq!(u16::MIN.to_i16(),  Some(u16::MIN as i16));
-        assert_eq!(u16::MIN.to_i32(),  Some(u16::MIN as i32));
-        assert_eq!(u16::MIN.to_i64(),  Some(u16::MIN as i64));
-        assert_eq!(u16::MIN.to_uint(), Some(u16::MIN as usize));
-        assert_eq!(u16::MIN.to_u8(),   Some(u16::MIN as u8));
-        assert_eq!(u16::MIN.to_u16(),  Some(u16::MIN as u16));
-        assert_eq!(u16::MIN.to_u32(),  Some(u16::MIN as u32));
-        assert_eq!(u16::MIN.to_u64(),  Some(u16::MIN as u64));
-    }
-
-    #[test]
-    fn test_cast_range_u32_min() {
-        assert_eq!(u32::MIN.to_int(),  Some(u32::MIN as isize));
-        assert_eq!(u32::MIN.to_i8(),   Some(u32::MIN as i8));
-        assert_eq!(u32::MIN.to_i16(),  Some(u32::MIN as i16));
-        assert_eq!(u32::MIN.to_i32(),  Some(u32::MIN as i32));
-        assert_eq!(u32::MIN.to_i64(),  Some(u32::MIN as i64));
-        assert_eq!(u32::MIN.to_uint(), Some(u32::MIN as usize));
-        assert_eq!(u32::MIN.to_u8(),   Some(u32::MIN as u8));
-        assert_eq!(u32::MIN.to_u16(),  Some(u32::MIN as u16));
-        assert_eq!(u32::MIN.to_u32(),  Some(u32::MIN as u32));
-        assert_eq!(u32::MIN.to_u64(),  Some(u32::MIN as u64));
-    }
-
-    #[test]
-    fn test_cast_range_u64_min() {
-        assert_eq!(u64::MIN.to_int(),  Some(u64::MIN as isize));
-        assert_eq!(u64::MIN.to_i8(),   Some(u64::MIN as i8));
-        assert_eq!(u64::MIN.to_i16(),  Some(u64::MIN as i16));
-        assert_eq!(u64::MIN.to_i32(),  Some(u64::MIN as i32));
-        assert_eq!(u64::MIN.to_i64(),  Some(u64::MIN as i64));
-        assert_eq!(u64::MIN.to_uint(), Some(u64::MIN as usize));
-        assert_eq!(u64::MIN.to_u8(),   Some(u64::MIN as u8));
-        assert_eq!(u64::MIN.to_u16(),  Some(u64::MIN as u16));
-        assert_eq!(u64::MIN.to_u32(),  Some(u64::MIN as u32));
-        assert_eq!(u64::MIN.to_u64(),  Some(u64::MIN as u64));
-    }
-
-    #[test]
-    fn test_cast_range_uint_max() {
-        assert_eq!(usize::MAX.to_int(),  None);
-        assert_eq!(usize::MAX.to_i8(),   None);
-        assert_eq!(usize::MAX.to_i16(),  None);
-        assert_eq!(usize::MAX.to_i32(),  None);
-        // usize::MAX.to_i64() is word-size specific
-        assert_eq!(usize::MAX.to_u8(),   None);
-        assert_eq!(usize::MAX.to_u16(),  None);
-        // usize::MAX.to_u32() is word-size specific
-        assert_eq!(usize::MAX.to_u64(),  Some(usize::MAX as u64));
-
-        #[cfg(target_pointer_width = "32")]
-        fn check_word_size() {
-            assert_eq!(usize::MAX.to_u32(), Some(usize::MAX as u32));
-            assert_eq!(usize::MAX.to_i64(), Some(usize::MAX as i64));
-        }
-
-        #[cfg(target_pointer_width = "64")]
-        fn check_word_size() {
-            assert_eq!(usize::MAX.to_u32(), None);
-            assert_eq!(usize::MAX.to_i64(), None);
-        }
-
-        check_word_size();
-    }
-
-    #[test]
-    fn test_cast_range_u8_max() {
-        assert_eq!(u8::MAX.to_int(),  Some(u8::MAX as isize));
-        assert_eq!(u8::MAX.to_i8(),   None);
-        assert_eq!(u8::MAX.to_i16(),  Some(u8::MAX as i16));
-        assert_eq!(u8::MAX.to_i32(),  Some(u8::MAX as i32));
-        assert_eq!(u8::MAX.to_i64(),  Some(u8::MAX as i64));
-        assert_eq!(u8::MAX.to_uint(), Some(u8::MAX as usize));
-        assert_eq!(u8::MAX.to_u8(),   Some(u8::MAX as u8));
-        assert_eq!(u8::MAX.to_u16(),  Some(u8::MAX as u16));
-        assert_eq!(u8::MAX.to_u32(),  Some(u8::MAX as u32));
-        assert_eq!(u8::MAX.to_u64(),  Some(u8::MAX as u64));
-    }
-
-    #[test]
-    fn test_cast_range_u16_max() {
-        assert_eq!(u16::MAX.to_int(),  Some(u16::MAX as isize));
-        assert_eq!(u16::MAX.to_i8(),   None);
-        assert_eq!(u16::MAX.to_i16(),  None);
-        assert_eq!(u16::MAX.to_i32(),  Some(u16::MAX as i32));
-        assert_eq!(u16::MAX.to_i64(),  Some(u16::MAX as i64));
-        assert_eq!(u16::MAX.to_uint(), Some(u16::MAX as usize));
-        assert_eq!(u16::MAX.to_u8(),   None);
-        assert_eq!(u16::MAX.to_u16(),  Some(u16::MAX as u16));
-        assert_eq!(u16::MAX.to_u32(),  Some(u16::MAX as u32));
-        assert_eq!(u16::MAX.to_u64(),  Some(u16::MAX as u64));
-    }
-
-    #[test]
-    fn test_cast_range_u32_max() {
-        // u32::MAX.to_int() is word-size specific
-        assert_eq!(u32::MAX.to_i8(),   None);
-        assert_eq!(u32::MAX.to_i16(),  None);
-        assert_eq!(u32::MAX.to_i32(),  None);
-        assert_eq!(u32::MAX.to_i64(),  Some(u32::MAX as i64));
-        assert_eq!(u32::MAX.to_uint(), Some(u32::MAX as usize));
-        assert_eq!(u32::MAX.to_u8(),   None);
-        assert_eq!(u32::MAX.to_u16(),  None);
-        assert_eq!(u32::MAX.to_u32(),  Some(u32::MAX as u32));
-        assert_eq!(u32::MAX.to_u64(),  Some(u32::MAX as u64));
-
-        #[cfg(target_pointer_width = "32")]
-        fn check_word_size() {
-            assert_eq!(u32::MAX.to_int(),  None);
-        }
-
-        #[cfg(target_pointer_width = "64")]
-        fn check_word_size() {
-            assert_eq!(u32::MAX.to_int(),  Some(u32::MAX as isize));
-        }
-
-        check_word_size();
-    }
-
-    #[test]
-    fn test_cast_range_u64_max() {
-        assert_eq!(u64::MAX.to_int(),  None);
-        assert_eq!(u64::MAX.to_i8(),   None);
-        assert_eq!(u64::MAX.to_i16(),  None);
-        assert_eq!(u64::MAX.to_i32(),  None);
-        assert_eq!(u64::MAX.to_i64(),  None);
-        // u64::MAX.to_uint() is word-size specific
-        assert_eq!(u64::MAX.to_u8(),   None);
-        assert_eq!(u64::MAX.to_u16(),  None);
-        assert_eq!(u64::MAX.to_u32(),  None);
-        assert_eq!(u64::MAX.to_u64(),  Some(u64::MAX as u64));
-
-        #[cfg(target_pointer_width = "32")]
-        fn check_word_size() {
-            assert_eq!(u64::MAX.to_uint(), None);
-        }
-
-        #[cfg(target_pointer_width = "64")]
-        fn check_word_size() {
-            assert_eq!(u64::MAX.to_uint(), Some(u64::MAX as usize));
-        }
-
-        check_word_size();
-    }
+    use ops::Mul;
 
     #[test]
     fn test_saturating_add_uint() {
@@ -507,23 +106,23 @@ mod tests {
     #[test]
     fn test_saturating_add_int() {
         use isize::{MIN,MAX};
-        assert_eq!(3.saturating_add(5), 8);
-        assert_eq!(3.saturating_add(MAX-1), MAX);
+        assert_eq!(3i32.saturating_add(5), 8);
+        assert_eq!(3isize.saturating_add(MAX-1), MAX);
         assert_eq!(MAX.saturating_add(MAX), MAX);
         assert_eq!((MAX-2).saturating_add(1), MAX-1);
-        assert_eq!(3.saturating_add(-5), -2);
+        assert_eq!(3i32.saturating_add(-5), -2);
         assert_eq!(MIN.saturating_add(-1), MIN);
-        assert_eq!((-2).saturating_add(-MAX), MIN);
+        assert_eq!((-2isize).saturating_add(-MAX), MIN);
     }
 
     #[test]
     fn test_saturating_sub_int() {
         use isize::{MIN,MAX};
-        assert_eq!(3.saturating_sub(5), -2);
+        assert_eq!(3i32.saturating_sub(5), -2);
         assert_eq!(MIN.saturating_sub(1), MIN);
-        assert_eq!((-2).saturating_sub(MAX), MIN);
-        assert_eq!(3.saturating_sub(-5), 8);
-        assert_eq!(3.saturating_sub(-(MAX-1)), MAX);
+        assert_eq!((-2isize).saturating_sub(MAX), MIN);
+        assert_eq!(3i32.saturating_sub(-5), 8);
+        assert_eq!(3isize.saturating_sub(-(MAX-1)), MAX);
         assert_eq!(MAX.saturating_sub(-MAX), MAX);
         assert_eq!((MAX-2).saturating_sub(-1), MAX-1);
     }
@@ -627,56 +226,10 @@ mod tests {
     test_checked_next_power_of_two! { test_checked_next_power_of_two_u64, u64 }
     test_checked_next_power_of_two! { test_checked_next_power_of_two_uint, usize }
 
-    #[derive(PartialEq, Debug)]
-    struct Value { x: isize }
-
-    impl ToPrimitive for Value {
-        fn to_i64(&self) -> Option<i64> { self.x.to_i64() }
-        fn to_u64(&self) -> Option<u64> { self.x.to_u64() }
-    }
-
-    impl FromPrimitive for Value {
-        fn from_i64(n: i64) -> Option<Value> { Some(Value { x: n as isize }) }
-        fn from_u64(n: u64) -> Option<Value> { Some(Value { x: n as isize }) }
-    }
-
-    #[test]
-    fn test_to_primitive() {
-        let value = Value { x: 5 };
-        assert_eq!(value.to_int(),  Some(5));
-        assert_eq!(value.to_i8(),   Some(5));
-        assert_eq!(value.to_i16(),  Some(5));
-        assert_eq!(value.to_i32(),  Some(5));
-        assert_eq!(value.to_i64(),  Some(5));
-        assert_eq!(value.to_uint(), Some(5));
-        assert_eq!(value.to_u8(),   Some(5));
-        assert_eq!(value.to_u16(),  Some(5));
-        assert_eq!(value.to_u32(),  Some(5));
-        assert_eq!(value.to_u64(),  Some(5));
-        assert_eq!(value.to_f32(),  Some(5f32));
-        assert_eq!(value.to_f64(),  Some(5f64));
-    }
-
-    #[test]
-    fn test_from_primitive() {
-        assert_eq!(from_int(5),    Some(Value { x: 5 }));
-        assert_eq!(from_i8(5),     Some(Value { x: 5 }));
-        assert_eq!(from_i16(5),    Some(Value { x: 5 }));
-        assert_eq!(from_i32(5),    Some(Value { x: 5 }));
-        assert_eq!(from_i64(5),    Some(Value { x: 5 }));
-        assert_eq!(from_uint(5),   Some(Value { x: 5 }));
-        assert_eq!(from_u8(5),     Some(Value { x: 5 }));
-        assert_eq!(from_u16(5),    Some(Value { x: 5 }));
-        assert_eq!(from_u32(5),    Some(Value { x: 5 }));
-        assert_eq!(from_u64(5),    Some(Value { x: 5 }));
-        assert_eq!(from_f32(5f32), Some(Value { x: 5 }));
-        assert_eq!(from_f64(5f64), Some(Value { x: 5 }));
-    }
-
     #[test]
     fn test_pow() {
-        fn naive_pow<T: Int>(base: T, exp: usize) -> T {
-            let one: T = Int::one();
+        fn naive_pow<T: Mul<Output=T> + One + Copy>(base: T, exp: usize) -> T {
+            let one: T = T::one();
             (0..exp).fold(one, |acc, _| acc * base)
         }
         macro_rules! assert_pow {
@@ -686,11 +239,11 @@ mod tests {
                 assert_eq!(result, naive_pow($num, $exp));
             }}
         }
-        assert_pow!((3,     0 ) => 1);
-        assert_pow!((5,     1 ) => 5);
-        assert_pow!((-4,    2 ) => 16);
-        assert_pow!((8,     3 ) => 512);
-        assert_pow!((2u64,   50) => 1125899906842624);
+        assert_pow!((3u32,     0 ) => 1);
+        assert_pow!((5u32,     1 ) => 5);
+        assert_pow!((-4i32,    2 ) => 16);
+        assert_pow!((8u32,     3 ) => 512);
+        assert_pow!((2u64,     50) => 1125899906842624);
     }
 
     #[test]
@@ -765,12 +318,11 @@ mod tests {
 mod bench {
     extern crate test;
     use self::test::Bencher;
-    use num::Int;
     use prelude::v1::*;
 
     #[bench]
     fn bench_pow_function(b: &mut Bencher) {
-        let v = (0..1024).collect::<Vec<_>>();
-        b.iter(|| {v.iter().fold(0, |old, new| old.pow(*new as u32));});
+        let v = (0..1024).collect::<Vec<u32>>();
+        b.iter(|| {v.iter().fold(0u32, |old, new| old.pow(*new as u32));});
     }
 }
diff --git a/src/libstd/num/uint_macros.rs b/src/libstd/num/uint_macros.rs
index c9e6a8f66d1..96b0ba1c77f 100644
--- a/src/libstd/num/uint_macros.rs
+++ b/src/libstd/num/uint_macros.rs
@@ -12,12 +12,11 @@
 #![doc(hidden)]
 #![allow(unsigned_negation)]
 
-macro_rules! uint_module { ($T:ty) => (
+macro_rules! uint_module { ($T:ident) => (
 
 #[cfg(test)]
 mod tests {
     use prelude::v1::*;
-    use num::FromStrRadix;
 
     fn from_str<T: ::str::FromStr>(t: &str) -> Option<T> {
         ::str::FromStr::from_str(t).ok()
@@ -38,15 +37,15 @@ mod tests {
 
     #[test]
     pub fn test_parse_bytes() {
-        assert_eq!(FromStrRadix::from_str_radix("123", 10), Ok(123 as $T));
-        assert_eq!(FromStrRadix::from_str_radix("1001", 2), Ok(9 as $T));
-        assert_eq!(FromStrRadix::from_str_radix("123", 8), Ok(83 as $T));
-        assert_eq!(FromStrRadix::from_str_radix("123", 16), Ok(291 as u16));
-        assert_eq!(FromStrRadix::from_str_radix("ffff", 16), Ok(65535 as u16));
-        assert_eq!(FromStrRadix::from_str_radix("z", 36), Ok(35 as $T));
-
-        assert_eq!(FromStrRadix::from_str_radix("Z", 10).ok(), None::<$T>);
-        assert_eq!(FromStrRadix::from_str_radix("_", 2).ok(), None::<$T>);
+        assert_eq!($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>);
     }
 }