Fix some impls such that all supertraits are actually implemented.

src/libextra/num/bigint.rs

@@ -732,6 +732,11 @@ impl Ord for Sign {
     }
 }
 
+impl TotalEq for Sign {
+    fn equals(&self, other: &Sign) -> bool {
+        *self == *other
+    }
+}
 impl TotalOrd for Sign {
 
     fn cmp(&self, other: &Sign) -> Ordering {

src/libextra/num/rational.rs

@@ -110,6 +110,25 @@ cmp_impl!(impl TotalEq, equals)
 cmp_impl!(impl Ord, lt, gt, le, ge)
 cmp_impl!(impl TotalOrd, cmp -> cmp::Ordering)
 
+impl<T: Clone + Integer + Ord> Orderable for Ratio<T> {
+    #[inline]
+    fn min(&self, other: &Ratio<T>) -> Ratio<T> {
+        if *self < *other { self.clone() } else { other.clone() }
+    }
+
+    #[inline]
+    fn max(&self, other: &Ratio<T>) -> Ratio<T> {
+        if *self > *other { self.clone() } else { other.clone() }
+    }
+
+    #[inline]
+    fn clamp(&self, mn: &Ratio<T>, mx: &Ratio<T>) -> Ratio<T> {
+        if *self > *mx { mx.clone()} else
+        if *self < *mn { mn.clone() } else { self.clone() }
+    }
+}
+
+
 /* Arithmetic */
 // a/b * c/d = (a*c)/(b*d)
 impl<T: Clone + Integer + Ord>

src/libstd/cmp.rs

@@ -86,6 +86,12 @@ pub trait TotalOrd: TotalEq {
     fn cmp(&self, other: &Self) -> Ordering;
 }
 
+impl TotalEq for Ordering {
+    #[inline]
+    fn equals(&self, other: &Ordering) -> bool {
+        *self == *other
+    }
+}
 impl TotalOrd for Ordering {
     #[inline]
     fn cmp(&self, other: &Ordering) -> Ordering {

src/libstd/iterator.rs

@@ -86,7 +86,7 @@ impl<A, T: DoubleEndedIterator<A>> Iterator<A> for InvertIterator<A, T> {
     fn size_hint(&self) -> (uint, Option<uint>) { self.iter.size_hint() }
 }
 
-impl<A, T: Iterator<A>> DoubleEndedIterator<A> for InvertIterator<A, T> {
+impl<A, T: DoubleEndedIterator<A>> DoubleEndedIterator<A> for InvertIterator<A, T> {
     #[inline]
     fn next_back(&mut self) -> Option<A> { self.iter.next() }
 }