From 5ac9f5499e3f3a13b751fc8696648b4e5a7610d8 Mon Sep 17 00:00:00 2001
From: Diggory Hardy <git@dhardy.name>
Date: Fri, 9 Mar 2018 10:21:46 +0000
Subject: [PATCH] Use DerefMut instead of direct Box/&mut impls

---
 rand-core/src/lib.rs | 28 ++--------------------------
 1 file changed, 2 insertions(+), 26 deletions(-)

diff --git a/rand-core/src/lib.rs b/rand-core/src/lib.rs
index c29a00573fd..15ff848f040 100644
--- a/rand-core/src/lib.rs
+++ b/rand-core/src/lib.rs
@@ -43,8 +43,7 @@
 
 use core::default::Default;
 use core::convert::AsMut;
-
-#[cfg(all(feature="alloc", not(feature="std")))] use alloc::boxed::Box;
+use core::ops::DerefMut;
 
 pub use error::{ErrorKind, Error};
 
@@ -262,30 +261,7 @@ pub trait SeedableRng: Sized {
 }
 
 
-impl<'a, R: RngCore + ?Sized> RngCore for &'a mut R {
-    #[inline]
-    fn next_u32(&mut self) -> u32 {
-        (**self).next_u32()
-    }
-
-    #[inline]
-    fn next_u64(&mut self) -> u64 {
-        (**self).next_u64()
-    }
-
-    #[inline]
-    fn fill_bytes(&mut self, dest: &mut [u8]) {
-        (**self).fill_bytes(dest)
-    }
-    
-    #[inline]
-    fn try_fill_bytes(&mut self, dest: &mut [u8]) -> Result<(), Error> {
-        (**self).try_fill_bytes(dest)
-    }
-}
-
-#[cfg(any(feature="std", feature="alloc"))]
-impl<R: RngCore + ?Sized> RngCore for Box<R> {
+impl<R: RngCore + ?Sized, T: DerefMut<Target = R>> RngCore for T {
     #[inline]
     fn next_u32(&mut self) -> u32 {
         (**self).next_u32()