diff --git a/src/libstd/cell.rs b/src/libcore/cell.rs
similarity index 97%
rename from src/libstd/cell.rs
rename to src/libcore/cell.rs
index 1e4faf1a899..8c520a4788a 100644
--- a/src/libstd/cell.rs
+++ b/src/libcore/cell.rs
@@ -12,7 +12,6 @@
 
 use clone::Clone;
 use cmp::Eq;
-use fmt;
 use kinds::{marker, Copy};
 use ops::{Deref, DerefMut, Drop};
 use option::{None, Option, Some};
@@ -60,12 +59,6 @@ impl<T:Eq + Copy> Eq for Cell<T> {
     }
 }
 
-impl<T: Copy + fmt::Show> fmt::Show for Cell<T> {
-    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        write!(f.buf, r"Cell \{ value: {} \}", self.get())
-    }
-}
-
 /// A mutable memory location with dynamically checked borrow rules
 pub struct RefCell<T> {
     value: Unsafe<T>,
diff --git a/src/libcore/lib.rs b/src/libcore/lib.rs
index a0938c83eca..550dcc1fed8 100644
--- a/src/libcore/lib.rs
+++ b/src/libcore/lib.rs
@@ -67,11 +67,12 @@ mod unicode;
 mod unit;
 pub mod any;
 pub mod bool;
+pub mod cell;
+pub mod char;
 pub mod finally;
 pub mod iter;
 pub mod option;
 pub mod raw;
-pub mod char;
 pub mod result;
 pub mod slice;
 pub mod str;
diff --git a/src/libstd/fmt/mod.rs b/src/libstd/fmt/mod.rs
index 8cfc0ae54c3..74ab874d319 100644
--- a/src/libstd/fmt/mod.rs
+++ b/src/libstd/fmt/mod.rs
@@ -485,6 +485,7 @@ will look like `"\\{"`.
 
 use any;
 use cast;
+use cell::Cell;
 use char::Char;
 use cmp;
 use container::Container;
@@ -492,6 +493,7 @@ use io::MemWriter;
 use io;
 use iter;
 use iter::{Iterator, range};
+use kinds::Copy;
 use num::Signed;
 use option::{Option, Some, None};
 use owned::Box;
diff --git a/src/libstd/lib.rs b/src/libstd/lib.rs
index 95d67eb77d1..4a555035a08 100644
--- a/src/libstd/lib.rs
+++ b/src/libstd/lib.rs
@@ -141,6 +141,7 @@ extern crate core;
 pub use core::any;
 pub use core::bool;
 pub use core::cast;
+pub use core::cell;
 pub use core::char;
 pub use core::clone;
 pub use core::container;
@@ -220,7 +221,6 @@ pub mod hash;
 /* Common data structures */
 
 pub mod result;
-pub mod cell;
 
 
 /* Tasks and communication */