diff --git a/src/lib.rs b/src/lib.rs
index 6ffb28f642f..23340a713ce 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -8,6 +8,7 @@ pub use std::*;
 
 mod bench;
 mod table;
+mod shim;
 pub mod hash_map;
 pub mod hash_set;
 
@@ -18,66 +19,3 @@ trait Recover<Q: ?Sized> {
     fn take(&mut self, key: &Q) -> Option<Self::Key>;
     fn replace(&mut self, key: Self::Key) -> Option<Self::Key>;
 }
-
-mod shim {
-    use std::marker::PhantomData;
-
-    pub struct NonZeroPtr<T: 'static>(&'static T);
-
-    impl<T: 'static> NonZeroPtr<T> {
-        pub unsafe fn new_unchecked(ptr: *mut T) -> Self {
-            NonZeroPtr(&*ptr)
-        }
-        pub fn as_ptr(&self) -> *mut T {
-            self.0 as *const T as *mut T
-        }
-    }
-
-    pub struct Unique<T: 'static> {
-        ptr: NonZeroPtr<T>,
-        _marker: PhantomData<T>,
-    }
-
-    impl<T: 'static> Unique<T> {
-        pub unsafe fn new_unchecked(ptr: *mut T) -> Self {
-            Unique {
-                ptr: NonZeroPtr::new_unchecked(ptr),
-                _marker: PhantomData,
-            }
-        }
-        pub fn as_ptr(&self) -> *mut T {
-            self.ptr.as_ptr()
-        }
-    }
-
-    unsafe impl<T: Send + 'static> Send for Unique<T> { }
-
-    unsafe impl<T: Sync + 'static> Sync for Unique<T> { }
-
-    pub struct Shared<T: 'static>  {
-        ptr: NonZeroPtr<T>,
-        _marker: PhantomData<T>,
-        // force it to be !Send/!Sync
-        _marker2: PhantomData<*const u8>,
-    }
-
-    impl<T: 'static> Shared<T> {
-        pub unsafe fn new_unchecked(ptr: *mut T) -> Self {
-            Shared {
-                ptr: NonZeroPtr::new_unchecked(ptr),
-                _marker: PhantomData,
-                _marker2: PhantomData,
-            }
-        }
-
-        pub unsafe fn as_mut(&self) -> &mut T {
-            &mut *self.ptr.as_ptr()
-        }
-    }
-
-    impl<'a, T> From<&'a mut T> for Shared<T> {
-        fn from(reference: &'a mut T) -> Self {
-            unsafe { Shared::new_unchecked(reference) }
-        }
-    }
-}
diff --git a/src/shim.rs b/src/shim.rs
new file mode 100644
index 00000000000..08fbf32b72f
--- /dev/null
+++ b/src/shim.rs
@@ -0,0 +1,60 @@
+use std::marker::PhantomData;
+
+pub struct NonZeroPtr<T: 'static>(&'static T);
+
+impl<T: 'static> NonZeroPtr<T> {
+    pub unsafe fn new_unchecked(ptr: *mut T) -> Self {
+        NonZeroPtr(&*ptr)
+    }
+    pub fn as_ptr(&self) -> *mut T {
+        self.0 as *const T as *mut T
+    }
+}
+
+pub struct Unique<T: 'static> {
+    ptr: NonZeroPtr<T>,
+    _marker: PhantomData<T>,
+}
+
+impl<T: 'static> Unique<T> {
+    pub unsafe fn new_unchecked(ptr: *mut T) -> Self {
+        Unique {
+            ptr: NonZeroPtr::new_unchecked(ptr),
+            _marker: PhantomData,
+        }
+    }
+    pub fn as_ptr(&self) -> *mut T {
+        self.ptr.as_ptr()
+    }
+}
+
+unsafe impl<T: Send + 'static> Send for Unique<T> { }
+
+unsafe impl<T: Sync + 'static> Sync for Unique<T> { }
+
+pub struct Shared<T: 'static>  {
+    ptr: NonZeroPtr<T>,
+    _marker: PhantomData<T>,
+    // force it to be !Send/!Sync
+    _marker2: PhantomData<*const u8>,
+}
+
+impl<T: 'static> Shared<T> {
+    pub unsafe fn new_unchecked(ptr: *mut T) -> Self {
+        Shared {
+            ptr: NonZeroPtr::new_unchecked(ptr),
+            _marker: PhantomData,
+            _marker2: PhantomData,
+        }
+    }
+
+    pub unsafe fn as_mut(&self) -> &mut T {
+        &mut *self.ptr.as_ptr()
+    }
+}
+
+impl<'a, T> From<&'a mut T> for Shared<T> {
+    fn from(reference: &'a mut T) -> Self {
+        unsafe { Shared::new_unchecked(reference) }
+    }
+}
\ No newline at end of file