new, simpler approach to the iter library

src/libcore/iter-trait/vec.rs

@@ -0,0 +1,9 @@
+type IMPL_T<A> = [const A];
+
+fn EACH<A>(self: IMPL_T<A>, f: fn(A) -> bool) {
+    vec::each(self, f)
+}
+
+fn SIZE_HINT<A>(self: IMPL_T<A>) -> option<uint> {
+    some(vec::len(self))
+}