diff --git a/library/core/src/alloc/mod.rs b/library/core/src/alloc/mod.rs
index 1c8e667654469..7628642a73456 100644
--- a/library/core/src/alloc/mod.rs
+++ b/library/core/src/alloc/mod.rs
@@ -370,58 +370,3 @@ pub unsafe trait Allocator {
         self
     }
 }
-
-#[unstable(feature = "allocator_api", issue = "32838")]
-unsafe impl<A> Allocator for &A
-where
-    A: Allocator + ?Sized,
-{
-    #[inline]
-    fn allocate(&self, layout: Layout) -> Result<NonNull<[u8]>, AllocError> {
-        (**self).allocate(layout)
-    }
-
-    #[inline]
-    fn allocate_zeroed(&self, layout: Layout) -> Result<NonNull<[u8]>, AllocError> {
-        (**self).allocate_zeroed(layout)
-    }
-
-    #[inline]
-    unsafe fn deallocate(&self, ptr: NonNull<u8>, layout: Layout) {
-        // SAFETY: the safety contract must be upheld by the caller
-        unsafe { (**self).deallocate(ptr, layout) }
-    }
-
-    #[inline]
-    unsafe fn grow(
-        &self,
-        ptr: NonNull<u8>,
-        old_layout: Layout,
-        new_layout: Layout,
-    ) -> Result<NonNull<[u8]>, AllocError> {
-        // SAFETY: the safety contract must be upheld by the caller
-        unsafe { (**self).grow(ptr, old_layout, new_layout) }
-    }
-
-    #[inline]
-    unsafe fn grow_zeroed(
-        &self,
-        ptr: NonNull<u8>,
-        old_layout: Layout,
-        new_layout: Layout,
-    ) -> Result<NonNull<[u8]>, AllocError> {
-        // SAFETY: the safety contract must be upheld by the caller
-        unsafe { (**self).grow_zeroed(ptr, old_layout, new_layout) }
-    }
-
-    #[inline]
-    unsafe fn shrink(
-        &self,
-        ptr: NonNull<u8>,
-        old_layout: Layout,
-        new_layout: Layout,
-    ) -> Result<NonNull<[u8]>, AllocError> {
-        // SAFETY: the safety contract must be upheld by the caller
-        unsafe { (**self).shrink(ptr, old_layout, new_layout) }
-    }
-}