Remove Signed trait and add SignedInt trait

The methods have been moved into Float and SignedInt

26 files changed, 179 insertions, 130 deletions

diff --git a/src/etc/vim/syntax/rust.vim b/src/etc/vim/syntax/rust.vim
index a96e622e760..710092a3e5f 100644
--- a/src/etc/vim/syntax/rust.vim
+++ b/src/etc/vim/syntax/rust.vim
@@ -97,7 +97,7 @@ syn keyword rustTrait FromIterator IntoIterator Extend ExactSize
 syn keyword rustTrait Iterator DoubleEndedIterator
 syn keyword rustTrait RandomAccessIterator CloneableIterator
 syn keyword rustTrait OrdIterator MutableDoubleEndedIterator
-syn keyword rustTrait NumCast Signed Int UnsignedInt Float
+syn keyword rustTrait NumCast Int SignedInt UnsignedInt Float
 syn keyword rustTrait FloatMath ToPrimitive FromPrimitive
 syn keyword rustTrait Box
 syn keyword rustTrait GenericPath Path PosixPath WindowsPath
diff --git a/src/libcore/cmp.rs b/src/libcore/cmp.rs
index 6e87fe4ced0..ec339d10e4b 100644
--- a/src/libcore/cmp.rs
+++ b/src/libcore/cmp.rs
@@ -19,6 +19,8 @@
 //! operators, you could do the following:
 //!
 //! ```rust
+//! use core::num::SignedInt;
+//!
 //! // Our type.
 //! struct SketchyNum {
 //!     num : int
diff --git a/src/libcore/fmt/mod.rs b/src/libcore/fmt/mod.rs
index 081f373b831..380ca82783a 100644
--- a/src/libcore/fmt/mod.rs
+++ b/src/libcore/fmt/mod.rs
@@ -620,7 +620,7 @@ impl<'a, T> Pointer for &'a mut T {
 macro_rules! floating(($ty:ident) => {
     impl Float for $ty {
         fn fmt(&self, fmt: &mut Formatter) -> Result {
-            use num::{Float, Signed};
+            use num::Float;
 
             let digits = match fmt.precision {
                 Some(i) => float::DigExact(i),
@@ -641,7 +641,7 @@ macro_rules! floating(($ty:ident) => {
 
     impl LowerExp for $ty {
         fn fmt(&self, fmt: &mut Formatter) -> Result {
-            use num::{Float, Signed};
+            use num::Float;
 
             let digits = match fmt.precision {
                 Some(i) => float::DigExact(i),
@@ -662,7 +662,7 @@ macro_rules! floating(($ty:ident) => {
 
     impl UpperExp for $ty {
         fn fmt(&self, fmt: &mut Formatter) -> Result {
-            use num::{Float, Signed};
+            use num::Float;
 
             let digits = match fmt.precision {
                 Some(i) => float::DigExact(i),
diff --git a/src/libcore/iter.rs b/src/libcore/iter.rs
index a24b6d85007..ae0acc32926 100644
--- a/src/libcore/iter.rs
+++ b/src/libcore/iter.rs
@@ -573,6 +573,8 @@ pub trait Iterator<A> {
     /// # Example
     ///
     /// ```rust
+    /// use core::num::SignedInt;
+    ///
     /// let xs = [-3i, 0, 1, 5, -10];
     /// assert_eq!(*xs.iter().max_by(|x| x.abs()).unwrap(), -10);
     /// ```
@@ -597,6 +599,8 @@ pub trait Iterator<A> {
     /// # Example
     ///
     /// ```rust
+    /// use core::num::SignedInt;
+    ///
     /// let xs = [-3i, 0, 1, 5, -10];
     /// assert_eq!(*xs.iter().min_by(|x| x.abs()).unwrap(), 0);
     /// ```
diff --git a/src/libcore/num/f32.rs b/src/libcore/num/f32.rs
index 5913b8d75a7..ba03bb8f3d5 100644
--- a/src/libcore/num/f32.rs
+++ b/src/libcore/num/f32.rs
@@ -242,6 +242,41 @@ impl Float for f32 {
     #[inline]
     fn fract(self) -> f32 { self - self.trunc() }
 
+    /// Computes the absolute value of `self`. Returns `Float::nan()` if the
+    /// number is `Float::nan()`.
+    #[inline]
+    fn abs(self) -> f32 {
+        unsafe { intrinsics::fabsf32(self) }
+    }
+
+    /// Returns a number that represents the sign of `self`.
+    ///
+    /// - `1.0` if the number is positive, `+0.0` or `Float::infinity()`
+    /// - `-1.0` if the number is negative, `-0.0` or `Float::neg_infinity()`
+    /// - `Float::nan()` if the number is `Float::nan()`
+    #[inline]
+    fn signum(self) -> f32 {
+        if self.is_nan() {
+            Float::nan()
+        } else {
+            unsafe { intrinsics::copysignf32(1.0, self) }
+        }
+    }
+
+    /// Returns `true` if `self` is positive, including `+0.0` and
+    /// `Float::infinity()`.
+    #[inline]
+    fn is_positive(self) -> bool {
+        self > 0.0 || (1.0 / self) == Float::infinity()
+    }
+
+    /// Returns `true` if `self` is negative, including `-0.0` and
+    /// `Float::neg_infinity()`.
+    #[inline]
+    fn is_negative(self) -> bool {
+        self < 0.0 || (1.0 / self) == Float::neg_infinity()
+    }
+
     /// Fused multiply-add. Computes `(self * a) + b` with only one rounding
     /// error. This produces a more accurate result with better performance than
     /// a separate multiplication operation followed by an add.
@@ -254,6 +289,7 @@ impl Float for f32 {
     #[inline]
     fn recip(self) -> f32 { 1.0 / self }
 
+    #[inline]
     fn powi(self, n: i32) -> f32 {
         unsafe { intrinsics::powif32(self, n) }
     }
diff --git a/src/libcore/num/f64.rs b/src/libcore/num/f64.rs
index 8f68578d768..f1af4f0272c 100644
--- a/src/libcore/num/f64.rs
+++ b/src/libcore/num/f64.rs
@@ -248,6 +248,41 @@ impl Float for f64 {
     #[inline]
     fn fract(self) -> f64 { self - self.trunc() }
 
+    /// Computes the absolute value of `self`. Returns `Float::nan()` if the
+    /// number is `Float::nan()`.
+    #[inline]
+    fn abs(self) -> f64 {
+        unsafe { intrinsics::fabsf64(self) }
+    }
+
+    /// Returns a number that represents the sign of `self`.
+    ///
+    /// - `1.0` if the number is positive, `+0.0` or `Float::infinity()`
+    /// - `-1.0` if the number is negative, `-0.0` or `Float::neg_infinity()`
+    /// - `Float::nan()` if the number is `Float::nan()`
+    #[inline]
+    fn signum(self) -> f64 {
+        if self.is_nan() {
+            Float::nan()
+        } else {
+            unsafe { intrinsics::copysignf64(1.0, self) }
+        }
+    }
+
+    /// Returns `true` if `self` is positive, including `+0.0` and
+    /// `Float::infinity()`.
+    #[inline]
+    fn is_positive(self) -> bool {
+        self > 0.0 || (1.0 / self) == Float::infinity()
+    }
+
+    /// Returns `true` if `self` is negative, including `-0.0` and
+    /// `Float::neg_infinity()`.
+    #[inline]
+    fn is_negative(self) -> bool {
+        self < 0.0 || (1.0 / self) == Float::neg_infinity()
+    }
+
     /// Fused multiply-add. Computes `(self * a) + b` with only one rounding
     /// error. This produces a more accurate result with better performance than
     /// a separate multiplication operation followed by an add.
diff --git a/src/libcore/num/float_macros.rs b/src/libcore/num/float_macros.rs
index 3e403219a4f..d15cff3a8a9 100644
--- a/src/libcore/num/float_macros.rs
+++ b/src/libcore/num/float_macros.rs
@@ -13,6 +13,7 @@
 
 macro_rules! assert_approx_eq(
     ($a:expr, $b:expr) => ({
+        use num::Float;
         let (a, b) = (&$a, &$b);
         assert!((*a - *b).abs() < 1.0e-6,
                 "{} is not approximately equal to {}", *a, *b);
diff --git a/src/libcore/num/mod.rs b/src/libcore/num/mod.rs
index dd2ee6e01c6..216d140ac48 100644
--- a/src/libcore/num/mod.rs
+++ b/src/libcore/num/mod.rs
@@ -33,113 +33,6 @@ pub fn div_rem<T: Div<T, T> + Rem<T, T>>(x: T, y: T) -> (T, T) {
     (x / y, x % y)
 }
 
-/// A built-in signed number.
-pub trait Signed: Neg<Self> {
-    /// Computes the absolute value of `self`.
-    fn abs(self) -> Self;
-
-    /// Returns a number (either `-1`, `0` or `1`) representing sign of `self`.
-    fn signum(self) -> Self;
-
-    /// Returns `true` if `self` is a positive value.
-    fn is_positive(self) -> bool;
-
-    /// Returns `true` if `self` is a negative value.
-    fn is_negative(self) -> bool;
-}
-
-macro_rules! signed_int_impl {
-    ($T:ty) => {
-        impl Signed for $T {
-            /// Computes the absolute value. `Int::min_value()` will be returned
-            /// if the number is `Int::min_value()`.
-            #[inline]
-            fn abs(self) -> $T {
-                if self.is_negative() { -self } else { self }
-            }
-
-            /// # Returns
-            ///
-            /// - `0` if the number is zero
-            /// - `1` if the number is positive
-            /// - `-1` if the number is negative
-            #[inline]
-            fn signum(self) -> $T {
-                match self {
-                    n if n > 0 =>  1,
-                    0          =>  0,
-                    _          => -1,
-                }
-            }
-
-            /// Returns `true` if `self` is positive and `false` if the number
-            /// is zero or negative.
-            #[inline]
-            fn is_positive(self) -> bool { self > 0 }
-
-            /// Returns `true` if `self` is negative and `false` if the number
-            /// is zero or positive.
-            #[inline]
-            fn is_negative(self) -> bool { self < 0 }
-        }
-    }
-}
-
-signed_int_impl!(i8)
-signed_int_impl!(i16)
-signed_int_impl!(i32)
-signed_int_impl!(i64)
-signed_int_impl!(int)
-
-macro_rules! signed_float_impl {
-    ($T:ty, $fabs:path, $fcopysign:path) => {
-        impl Signed for $T {
-            /// Computes the absolute value. Returns `Float::nan()` if the
-            /// number is `Float::nan()`.
-            #[inline]
-            fn abs(self) -> $T {
-                unsafe { $fabs(self) }
-            }
-
-            /// # Returns
-            ///
-            /// - `1.0` if the number is positive, `+0.0` or `Float::infinity()`
-            /// - `-1.0` if the number is negative, `-0.0` or `Float::neg_infinity()`
-            /// - `Float::nan()` if the number is `Float::nan()`
-            #[inline]
-            fn signum(self) -> $T {
-                if self.is_nan() {
-                    Float::nan()
-                } else {
-                    unsafe { $fcopysign(1.0, self) }
-                }
-            }
-
-            /// Returns `true` if the number is positive, including `+0.0` and
-            /// `Float::infinity()`.
-            #[inline]
-            fn is_positive(self) -> bool {
-                self > 0.0 || (1.0 / self) == Float::infinity()
-            }
-
-            /// Returns `true` if the number is negative, including `-0.0` and
-            /// `Float::neg_infinity()`.
-            #[inline]
-            fn is_negative(self) -> bool {
-                self < 0.0 || (1.0 / self) == Float::neg_infinity()
-            }
-        }
-    };
-}
-
-signed_float_impl!(f32,
-    intrinsics::fabsf32,
-    intrinsics::copysignf32)
-
-signed_float_impl!(f64,
-    intrinsics::fabsf64,
-    intrinsics::copysignf64)
-
 /// Raises a `base` to the power of `exp`, using exponentiation by squaring.
 ///
 /// # Example
@@ -702,6 +595,63 @@ int_impl!(int = i64, u64, 64,
     intrinsics::i64_sub_with_overflow,
     intrinsics::i64_mul_with_overflow)
 
+/// A built-in two's complement integer.
+pub trait SignedInt
+    : Int
+    + Neg<Self>
+{
+    /// Computes the absolute value of `self`. `Int::min_value()` will be
+    /// returned if the number is `Int::min_value()`.
+    fn abs(self) -> Self;
+
+    /// Returns a number representing sign of `self`.
+    ///
+    /// - `0` if the number is zero
+    /// - `1` if the number is positive
+    /// - `-1` if the number is negative
+    fn signum(self) -> Self;
+
+    /// Returns `true` if `self` is positive and `false` if the number
+    /// is zero or negative.
+    fn is_positive(self) -> bool;
+
+    /// Returns `true` if `self` is negative and `false` if the number
+    /// is zero or positive.
+    fn is_negative(self) -> bool;
+}
+
+macro_rules! signed_int_impl {
+    ($T:ty) => {
+        impl SignedInt for $T {
+            #[inline]
+            fn abs(self) -> $T {
+                if self.is_negative() { -self } else { self }
+            }
+
+            #[inline]
+            fn signum(self) -> $T {
+                match self {
+                    n if n > 0 =>  1,
+                    0          =>  0,
+                    _          => -1,
+                }
+            }
+
+            #[inline]
+            fn is_positive(self) -> bool { self > 0 }
+
+            #[inline]
+            fn is_negative(self) -> bool { self < 0 }
+        }
+    }
+}
+
+signed_int_impl!(i8)
+signed_int_impl!(i16)
+signed_int_impl!(i32)
+signed_int_impl!(i64)
+signed_int_impl!(int)
+
 /// A built-in unsigned integer.
 pub trait UnsignedInt: Int {
     /// Returns `true` iff `self == 2^k` for some `k`.
@@ -1257,7 +1207,7 @@ pub trait Float
     + NumCast
     + PartialOrd
     + PartialEq
-    + Signed
+    + Neg<Self>
     + Add<Self,Self>
     + Sub<Self,Self>
     + Mul<Self,Self>
@@ -1327,6 +1277,22 @@ pub trait Float
     /// Return the fractional part of a number.
     fn fract(self) -> Self;
 
+    /// Computes the absolute value of `self`. Returns `Float::nan()` if the
+    /// number is `Float::nan()`.
+    fn abs(self) -> Self;
+    /// Returns a number that represents the sign of `self`.
+    ///
+    /// - `1.0` if the number is positive, `+0.0` or `Float::infinity()`
+    /// - `-1.0` if the number is negative, `-0.0` or `Float::neg_infinity()`
+    /// - `Float::nan()` if the number is `Float::nan()`
+    fn signum(self) -> Self;
+    /// Returns `true` if `self` is positive, including `+0.0` and
+    /// `Float::infinity()`.
+    fn is_positive(self) -> bool;
+    /// Returns `true` if `self` is negative, including `-0.0` and
+    /// `Float::neg_infinity()`.
+    fn is_negative(self) -> bool;
+
     /// Fused multiply-add. Computes `(self * a) + b` with only one rounding
     /// error. This produces a more accurate result with better performance than
     /// a separate multiplication operation followed by an add.
@@ -1494,14 +1460,6 @@ one_impl!(i64, 1i64)
 one_impl!(f32, 1.0f32)
 one_impl!(f64, 1.0f64)
 
-#[deprecated = "Use `Signed::abs`"]
-pub fn abs<T: Signed>(value: T) -> T {
-    value.abs()
-}
-#[deprecated = "Use `Signed::signum`"]
-pub fn signum<T: Signed>(value: T) -> T {
-    value.signum()
-}
 #[deprecated = "Use `UnsignedInt::next_power_of_two`"]
 pub fn next_power_of_two<T: UnsignedInt>(n: T) -> T {
     n.next_power_of_two()
diff --git a/src/libcore/prelude.rs b/src/libcore/prelude.rs
index 7e35f20f078..60012ab149f 100644
--- a/src/libcore/prelude.rs
+++ b/src/libcore/prelude.rs
@@ -51,7 +51,7 @@ pub use cmp::{Ordering, Less, Equal, Greater, Equiv};
 pub use iter::{FromIterator, Extend};
 pub use iter::{Iterator, DoubleEndedIterator, RandomAccessIterator, CloneableIterator};
 pub use iter::{OrdIterator, MutableDoubleEndedIterator, ExactSize};
-pub use num::{Signed, ToPrimitive, FromPrimitive};
+pub use num::{ToPrimitive, FromPrimitive};
 pub use option::{Option, Some, None};
 pub use ptr::RawPtr;
 pub use result::{Result, Ok, Err};
diff --git a/src/libcoretest/cmp.rs b/src/libcoretest/cmp.rs
index 59ce73fe40d..716300f652d 100644
--- a/src/libcoretest/cmp.rs
+++ b/src/libcoretest/cmp.rs
@@ -109,6 +109,8 @@ fn test_partial_max() {
 
 #[test]
 fn test_user_defined_eq() {
+    use core::num::SignedInt;
+
     // Our type.
     struct SketchyNum {
         num : int
diff --git a/src/libcoretest/iter.rs b/src/libcoretest/iter.rs
index 3bb8d735d9c..2f11307c461 100644
--- a/src/libcoretest/iter.rs
+++ b/src/libcoretest/iter.rs
@@ -10,6 +10,7 @@
 
 use core::iter::*;
 use core::iter::order::*;
+use core::num::SignedInt;
 use core::uint;
 use core::cmp;
 use core::ops::Slice;
diff --git a/src/libcoretest/num/int_macros.rs b/src/libcoretest/num/int_macros.rs
index a1b096bf454..5e2530ef2a9 100644
--- a/src/libcoretest/num/int_macros.rs
+++ b/src/libcoretest/num/int_macros.rs
@@ -15,7 +15,7 @@ macro_rules! int_module (($T:ty, $T_i:ident) => (
 mod tests {
     use core::$T_i::*;
     use core::int;
-    use core::num::Int;
+    use core::num::{Int, SignedInt};
     use num;
 
     #[test]
diff --git a/src/librand/distributions/mod.rs b/src/librand/distributions/mod.rs
index 73817a52fa7..7d54422601b 100644
--- a/src/librand/distributions/mod.rs
+++ b/src/librand/distributions/mod.rs
@@ -23,7 +23,7 @@ that do not need to record state.
 #![experimental]
 
 use core::prelude::*;
-use core::num::Int;
+use core::num::{Float, Int};
 
 use {Rng, Rand};
 
diff --git a/src/librustc/lint/builtin.rs b/src/librustc/lint/builtin.rs
index 3026e047626..055a4c5dff4 100644
--- a/src/librustc/lint/builtin.rs
+++ b/src/librustc/lint/builtin.rs
@@ -37,6 +37,7 @@ use lint::{Context, LintPass, LintArray};
 
 use std::cmp;
 use std::collections::hash_map::{Occupied, Vacant};
+use std::num::SignedInt;
 use std::slice;
 use std::{i8, i16, i32, i64, u8, u16, u32, u64, f32, f64};
 use syntax::abi;
diff --git a/src/libstd/num/float_macros.rs b/src/libstd/num/float_macros.rs
index 519de85edde..4b3727ead61 100644
--- a/src/libstd/num/float_macros.rs
+++ b/src/libstd/num/float_macros.rs
@@ -14,6 +14,7 @@
 
 macro_rules! assert_approx_eq(
     ($a:expr, $b:expr) => ({
+        use num::Float;
         let (a, b) = (&$a, &$b);
         assert!((*a - *b).abs() < 1.0e-6,
                 "{} is not approximately equal to {}", *a, *b);
diff --git a/src/libstd/num/mod.rs b/src/libstd/num/mod.rs
index 62e70e0c9de..0afc8ce0452 100644
--- a/src/libstd/num/mod.rs
+++ b/src/libstd/num/mod.rs
@@ -23,9 +23,8 @@ use option::Option;
 #[cfg(test)] use ops::{Add, Sub, Mul, Div, Rem};
 
 pub use core::num::{Num, div_rem, Zero, zero, One, one};
-pub use core::num::{Signed, abs, signum};
 pub use core::num::{Unsigned, pow, Bounded};
-pub use core::num::{Primitive, Int, UnsignedInt};
+pub use core::num::{Primitive, Int, SignedInt, UnsignedInt};
 pub use core::num::{cast, FromPrimitive, NumCast, ToPrimitive};
 pub use core::num::{next_power_of_two, is_power_of_two};
 pub use core::num::{checked_next_power_of_two};
diff --git a/src/libstd/prelude.rs b/src/libstd/prelude.rs
index 0baae850eaa..158e7a59f6d 100644
--- a/src/libstd/prelude.rs
+++ b/src/libstd/prelude.rs
@@ -67,7 +67,7 @@
 #[doc(no_inline)] pub use iter::{Iterator, DoubleEndedIterator};
 #[doc(no_inline)] pub use iter::{RandomAccessIterator, CloneableIterator};
 #[doc(no_inline)] pub use iter::{OrdIterator, MutableDoubleEndedIterator};
-#[doc(no_inline)] pub use num::{Signed, ToPrimitive, FromPrimitive};
+#[doc(no_inline)] pub use num::{ToPrimitive, FromPrimitive};
 #[doc(no_inline)] pub use boxed::Box;
 #[doc(no_inline)] pub use option::{Option, Some, None};
 #[doc(no_inline)] pub use path::{GenericPath, Path, PosixPath, WindowsPath};
diff --git a/src/libstd/sys/unix/mod.rs b/src/libstd/sys/unix/mod.rs
index 969570d385c..4db9e8a9df8 100644
--- a/src/libstd/sys/unix/mod.rs
+++ b/src/libstd/sys/unix/mod.rs
@@ -18,7 +18,7 @@
 extern crate libc;
 
 use num;
-use num::Int;
+use num::{Int, SignedInt};
 use prelude::*;
 use io::{mod, IoResult, IoError};
 use sys_common::mkerr_libc;
@@ -117,7 +117,7 @@ pub fn decode_error_detailed(errno: i32) -> IoError {
 }
 
 #[inline]
-pub fn retry<T: Signed + Int> (f: || -> T) -> T {
+pub fn retry<T: SignedInt> (f: || -> T) -> T {
     let one: T = Int::one();
     loop {
         let n = f();
diff --git a/src/libtest/lib.rs b/src/libtest/lib.rs
index a25aff3eaff..11788483397 100644
--- a/src/libtest/lib.rs
+++ b/src/libtest/lib.rs
@@ -60,7 +60,7 @@ use std::io::fs::PathExtensions;
 use std::io::stdio::StdWriter;
 use std::io::{File, ChanReader, ChanWriter};
 use std::io;
-use std::num::{Int, FloatMath};
+use std::num::{Float, FloatMath, Int};
 use std::os;
 use std::string::String;
 use std::task::TaskBuilder;
diff --git a/src/libtest/stats.rs b/src/libtest/stats.rs
index 5cec5076e06..adf58dc875c 100644
--- a/src/libtest/stats.rs
+++ b/src/libtest/stats.rs
@@ -461,6 +461,7 @@ mod tests {
 
     macro_rules! assert_approx_eq(
         ($a:expr, $b:expr) => ({
+            use std::num::Float;
             let (a, b) = (&$a, &$b);
             assert!((*a - *b).abs() < 1.0e-6,
                     "{} is not approximately equal to {}", *a, *b);
diff --git a/src/libtime/lib.rs b/src/libtime/lib.rs
index acd81d4566b..03b5186eef7 100644
--- a/src/libtime/lib.rs
+++ b/src/libtime/lib.rs
@@ -30,6 +30,7 @@ extern crate libc;
 use std::fmt::Show;
 use std::fmt;
 use std::io::BufReader;
+use std::num::SignedInt;
 use std::string::String;
 use std::time::Duration;
 
diff --git a/src/test/compile-fail/implicit-method-bind.rs b/src/test/compile-fail/implicit-method-bind.rs
index 06a4088617a..34367f06793 100644
--- a/src/test/compile-fail/implicit-method-bind.rs
+++ b/src/test/compile-fail/implicit-method-bind.rs
@@ -8,6 +8,8 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
+use std::num::SignedInt;
+
 fn main() {
     let _f = 10i.abs; //~ ERROR attempted to take value of method
 }
diff --git a/src/test/run-pass/const-binops.rs b/src/test/run-pass/const-binops.rs
index c14f430e709..f4dba3f6c7f 100644
--- a/src/test/run-pass/const-binops.rs
+++ b/src/test/run-pass/const-binops.rs
@@ -12,6 +12,7 @@
 
 macro_rules! assert_approx_eq(
     ($a:expr, $b:expr) => ({
+        use std::num::Float;
         let (a, b) = (&$a, &$b);
         assert!((*a - *b).abs() < 1.0e-6,
                 "{} is not approximately equal to {}", *a, *b);
diff --git a/src/test/run-pass/intrinsics-math.rs b/src/test/run-pass/intrinsics-math.rs
index 164a6845a9f..c3ba7ca12d0 100644
--- a/src/test/run-pass/intrinsics-math.rs
+++ b/src/test/run-pass/intrinsics-math.rs
@@ -13,6 +13,7 @@
 
 macro_rules! assert_approx_eq(
     ($a:expr, $b:expr) => ({
+        use std::num::Float;
         let (a, b) = (&$a, &$b);
         assert!((*a - *b).abs() < 1.0e-6,
                 "{} is not approximately equal to {}", *a, *b);
diff --git a/src/test/run-pass/trait-inheritance-self-in-supertype.rs b/src/test/run-pass/trait-inheritance-self-in-supertype.rs
index c7e206cb474..96f1c940dcf 100644
--- a/src/test/run-pass/trait-inheritance-self-in-supertype.rs
+++ b/src/test/run-pass/trait-inheritance-self-in-supertype.rs
@@ -10,6 +10,8 @@
 
 // Test for issue #4183: use of Self in supertraits.
 
+use std::num::Float as StdFloat;
+
 pub static FUZZY_EPSILON: f64 = 0.1;
 
 pub trait FuzzyEq<Eps> {
diff --git a/src/test/run-pass/utf8_idents.rs b/src/test/run-pass/utf8_idents.rs
index 68964fa4957..c99c394969c 100644
--- a/src/test/run-pass/utf8_idents.rs
+++ b/src/test/run-pass/utf8_idents.rs
@@ -10,9 +10,10 @@
 //
 // ignore-lexer-test FIXME #15679
 
-
 #![feature(non_ascii_idents)]
 
+use std::num::Float;
+
 pub fn main() {
     let ε = 0.00001f64;
     let Π = 3.14f64;