Rng: impl for unsized RngCore

Author: dhardy

src/distributions/other.rs

@@ -165,7 +165,7 @@ mod tests {
 
     #[test]
     fn test_misc() {
-        let mut rng: &mut RngCore = &mut ::test::rng(820);
+        let rng: &mut RngCore = &mut ::test::rng(820);
 
         rng.sample::<char, _>(Uniform);
         rng.sample::<bool, _>(Uniform);

src/lib.rs

@@ -640,7 +640,7 @@ pub trait Rng: RngCore {
     }
 }
 
-impl<R: RngCore> Rng for R {}
+impl<R: RngCore + ?Sized> Rng for R {}
 
 /// Trait for casting types to byte slices
 ///