diff --git a/src/liballoc/collections/linked_list.rs b/src/liballoc/collections/linked_list.rs
index 702df250999fb..8d73f352fd4a1 100644
--- a/src/liballoc/collections/linked_list.rs
+++ b/src/liballoc/collections/linked_list.rs
@@ -90,7 +90,7 @@ impl<T> Clone for Iter<'_, T> {
 #[stable(feature = "rust1", since = "1.0.0")]
 pub struct IterMut<'a, T: 'a> {
     // We do *not* exclusively own the entire list here, references to node's `element`
-    // have been handed out by the iterator!  So be careful when using this; the methods
+    // have been handed out by the iterator! So be careful when using this; the methods
     // called must be aware that there can be aliasing pointers to `element`.
     list: &'a mut LinkedList<T>,
     head: Option<NonNull<Node<T>>>,
diff --git a/src/liballoc/rc.rs b/src/liballoc/rc.rs
index f1c4c32e116ea..a11f9e8c14579 100644
--- a/src/liballoc/rc.rs
+++ b/src/liballoc/rc.rs
@@ -280,7 +280,7 @@ struct RcBox<T: ?Sized> {
 #[stable(feature = "rust1", since = "1.0.0")]
 pub struct Rc<T: ?Sized> {
     ptr: NonNull<RcBox<T>>,
-    phantom: PhantomData<T>,
+    phantom: PhantomData<RcBox<T>>,
 }
 
 #[stable(feature = "rust1", since = "1.0.0")]
diff --git a/src/liballoc/sync.rs b/src/liballoc/sync.rs
index 80d6c6e0d4390..4b10f089c2950 100644
--- a/src/liballoc/sync.rs
+++ b/src/liballoc/sync.rs
@@ -195,7 +195,7 @@ const MAX_REFCOUNT: usize = (isize::MAX) as usize;
 #[stable(feature = "rust1", since = "1.0.0")]
 pub struct Arc<T: ?Sized> {
     ptr: NonNull<ArcInner<T>>,
-    phantom: PhantomData<T>,
+    phantom: PhantomData<ArcInner<T>>,
 }
 
 #[stable(feature = "rust1", since = "1.0.0")]
diff --git a/src/libcore/cell.rs b/src/libcore/cell.rs
index fda103a52d8bc..817c04d0af924 100644
--- a/src/libcore/cell.rs
+++ b/src/libcore/cell.rs
@@ -137,9 +137,11 @@
 //! use std::cell::Cell;
 //! use std::ptr::NonNull;
 //! use std::intrinsics::abort;
+//! use std::marker::PhantomData;
 //!
 //! struct Rc<T: ?Sized> {
-//!     ptr: NonNull<RcBox<T>>
+//!     ptr: NonNull<RcBox<T>>,
+//!     phantom: PhantomData<RcBox<T>>,
 //! }
 //!
 //! struct RcBox<T: ?Sized> {
@@ -151,7 +153,10 @@
 //! impl<T: ?Sized> Clone for Rc<T> {
 //!     fn clone(&self) -> Rc<T> {
 //!         self.inc_strong();
-//!         Rc { ptr: self.ptr }
+//!         Rc {
+//!             ptr: self.ptr,
+//!             phantom: PhantomData,
+//!         }
 //!     }
 //! }
 //!