std: Move the iterator param on FromIterator and Extendable to the method.

If they are on the trait then it is extremely annoying to use them as
generic parameters to a function, e.g. with the iterator param on the trait
itself, if one was to pass an Extendable<int> to a function that filled it
either from a Range or a Map<VecIterator>, one needs to write something
like:

    fn foo<E: Extendable<int, Range<int>> +
              Extendable<int, Map<&'self int, int, VecIterator<int>>>
          (e: &mut E, ...) { ... }

since using a generic, i.e. `foo<E: Extendable<int, I>, I: Iterator<int>>`
means that `foo` takes 2 type parameters, and the caller has to specify them
(which doesn't work anyway, as they'll mismatch with the iterators used in
`foo` itself).

This patch changes it to:

    fn foo<E: Extendable<int>>(e: &mut E, ...) { ... }

1 files changed, 5 insertions, 5 deletions

diff --git a/src/libstd/iterator.rs b/src/libstd/iterator.rs
index bd89c271a36..1a5e364542b 100644
--- a/src/libstd/iterator.rs
+++ b/src/libstd/iterator.rs
@@ -26,15 +26,15 @@ use clone::Clone;
 use uint;
 
 /// Conversion from an `Iterator`
-pub trait FromIterator<A, T: Iterator<A>> {
+pub trait FromIterator<A> {
     /// Build a container with elements from an external iterator.
-    fn from_iterator(iterator: &mut T) -> Self;
+    fn from_iterator<T: Iterator<A>>(iterator: &mut T) -> Self;
 }
 
 /// A type growable from an `Iterator` implementation
-pub trait Extendable<A, T: Iterator<A>>: FromIterator<A, T> {
+pub trait Extendable<A>: FromIterator<A> {
     /// Extend a container with the elements yielded by an iterator
-    fn extend(&mut self, iterator: &mut T);
+    fn extend<T: Iterator<A>>(&mut self, iterator: &mut T);
 }
 
 /// An interface for dealing with "external iterators". These types of iterators
@@ -353,7 +353,7 @@ pub trait Iterator<A> {
     /// assert!(a == b);
     /// ~~~
     #[inline]
-    fn collect<B: FromIterator<A, Self>>(&mut self) -> B {
+    fn collect<B: FromIterator<A>>(&mut self) -> B {
         FromIterator::from_iterator(self)
     }