Rename Natural to Integer

'Natural' normally means 'positive integer' in mathematics. It is therefore strange to implement it on signed integer types. 'Integer' is probably a better choice.

src/libcore/core.rc

@@ -103,7 +103,8 @@ pub use iter::{BaseIter, ExtendedIter, EqIter, CopyableIter};
 pub use iter::{CopyableOrderedIter, CopyableNonstrictIter, Times};
 pub use iter::{ExtendedMutableIter};
 
-pub use num::{Num, Signed, Unsigned, Natural, NumCast};
+pub use num::{Num, NumCast};
+pub use num::{Signed, Unsigned, Integer};
 pub use ptr::Ptr;
 pub use to_str::ToStr;
 pub use clone::Clone;

src/libcore/num/int-template.rs

@@ -279,7 +279,7 @@ impl Signed for T {
     fn is_negative(&self) -> bool { *self < 0 }
 }
 
-impl Natural for T {
+impl Integer for T {
     /**
      * Floored integer division
      *

src/libcore/num/num.rs

@@ -61,7 +61,7 @@ pub fn abs<T:Ord + Zero + Neg<T>>(v: T) -> T {
     if v < Zero::zero() { v.neg() } else { v }
 }
 
-pub trait Natural: Num
+pub trait Integer: Num
                  + Ord
                  + Quot<Self,Self>
                  + Rem<Self,Self> {

src/libcore/num/uint-template.rs

@@ -176,7 +176,7 @@ impl Neg<T> for T {
 
 impl Unsigned for T {}
 
-impl Natural for T {
+impl Integer for T {
     /// Unsigned integer division. Returns the same result as `quot` (`/`).
     #[inline(always)]
     fn div(&self, other: T) -> T { *self / other }

src/libcore/prelude.rs

@@ -37,7 +37,8 @@ pub use hash::Hash;
 pub use iter::{BaseIter, ReverseIter, MutableIter, ExtendedIter, EqIter};
 pub use iter::{CopyableIter, CopyableOrderedIter, CopyableNonstrictIter};
 pub use iter::{Times, ExtendedMutableIter};
-pub use num::{Num, Signed, Unsigned, Natural, NumCast};
+pub use num::{Num, NumCast};
+pub use num::{Signed, Unsigned, Integer};
 pub use path::GenericPath;
 pub use path::Path;
 pub use path::PosixPath;