Revert "Auto merge of #296 - vks:no_std, r=cuviper"

This reverts commit 8b5d4ac, reversing
changes made to ef752e4.

Author: cuviper

traits/Cargo.toml

@@ -10,7 +10,3 @@ name = "num-traits"
 version = "0.1.38"
 
 [dependencies]
-
-[features]
-default = ["std"]
-std = []

traits/src/bounds.rs

@@ -1,7 +1,7 @@
-use core::{usize, u8, u16, u32, u64};
-use core::{isize, i8, i16, i32, i64};
-use core::{f32, f64};
-use core::num::Wrapping;
+use std::{usize, u8, u16, u32, u64};
+use std::{isize, i8, i16, i32, i64};
+use std::{f32, f64};
+use std::num::Wrapping;
 
 /// Numbers which have upper and lower bounds
 pub trait Bounded {

traits/src/cast.rs

@@ -1,9 +1,8 @@
-use core::mem::size_of;
-use core::num::Wrapping;
+use std::mem::size_of;
+use std::num::Wrapping;
 
 use identities::Zero;
 use bounds::Bounded;
-use float::Float;
 
 /// A generic trait for converting a value to a number.
 pub trait ToPrimitive {
@@ -227,8 +226,8 @@ macro_rules! impl_to_primitive_float_to_float {
             // Make sure the value is in range for the cast.
             // NaN and +-inf are cast as they are.
             let n = $slf as f64;
-            let max_value: $DstT = ::core::$DstT::MAX;
-            if !Float::is_finite(n) || (-max_value as f64 <= n && n <= max_value as f64) {
+            let max_value: $DstT = ::std::$DstT::MAX;
+            if !n.is_finite() || (-max_value as f64 <= n && n <= max_value as f64) {
                 Some($slf as $DstT)
             } else {
                 None
@@ -455,8 +454,8 @@ impl<T: NumCast> NumCast for Wrapping<T> {
 
 #[test]
 fn to_primitive_float() {
-    use core::f32;
-    use core::f64;
+    use std::f32;
+    use std::f64;
 
     let f32_toolarge = 1e39f64;
     assert_eq!(f32_toolarge.to_f32(), None);