Merge pull request #620 from dhardy/fused

Implement TrustedLen and FusedIterator for DistIter

src/distributions/mod.rs

@@ -182,6 +182,8 @@
 //! [`Weibull`]: struct.Weibull.html
 //! [`WeightedIndex`]: struct.WeightedIndex.html
 
+#[cfg(any(rust_1_26, features="nightly"))]
+use core::iter;
 use Rng;
 
 pub use self::other::Alphanumeric;
@@ -314,6 +316,14 @@ impl<'a, D, R, T> Iterator for DistIter<'a, D, R, T>
     }
 }
 
+#[cfg(rust_1_26)]
+impl<'a, D, R, T> iter::FusedIterator for DistIter<'a, D, R, T>
+    where D: Distribution<T>, R: Rng + 'a {}
+
+#[cfg(features = "nightly")]
+impl<'a, D, R, T> iter::TrustedLen for DistIter<'a, D, R, T>
+    where D: Distribution<T>, R: Rng + 'a {}
+
 
 /// A generic random value distribution, implemented for many primitive types.
 /// Usually generates values with a numerically uniform distribution, and with a