diff --git a/src/libstd/clone.rs b/src/libstd/clone.rs
index f24bc002a2b1e..6fd06c951917d 100644
--- a/src/libstd/clone.rs
+++ b/src/libstd/clone.rs
@@ -21,7 +21,7 @@ the `clone` method.
 
 */
 
-use core::kinds::Freeze;
+use std::kinds::Freeze;
 
 /// A common trait for cloning an object.
 pub trait Clone {
diff --git a/src/libstd/comm.rs b/src/libstd/comm.rs
index 1bb0ff044fe98..0acd6fee57efe 100644
--- a/src/libstd/comm.rs
+++ b/src/libstd/comm.rs
@@ -382,19 +382,19 @@ mod pipesy {
 
     #[allow(non_camel_case_types)]
     pub mod oneshot {
-        priv use core::kinds::Send;
+        priv use std::kinds::Send;
         use ptr::to_mut_unsafe_ptr;
 
         pub fn init<T: Send>() -> (server::Oneshot<T>, client::Oneshot<T>) {
-            pub use core::pipes::HasBuffer;
+            pub use std::pipes::HasBuffer;
 
-            let buffer = ~::core::pipes::Buffer {
-                header: ::core::pipes::BufferHeader(),
+            let buffer = ~::std::pipes::Buffer {
+                header: ::std::pipes::BufferHeader(),
                 data: __Buffer {
-                    Oneshot: ::core::pipes::mk_packet::<Oneshot<T>>()
+                    Oneshot: ::std::pipes::mk_packet::<Oneshot<T>>()
                 },
             };
-            do ::core::pipes::entangle_buffer(buffer) |buffer, data| {
+            do ::std::pipes::entangle_buffer(buffer) |buffer, data| {
                 data.Oneshot.set_buffer(buffer);
                 to_mut_unsafe_ptr(&mut data.Oneshot)
             }
@@ -403,23 +403,23 @@ mod pipesy {
         pub enum Oneshot<T> { pub send(T), }
         #[allow(non_camel_case_types)]
         pub struct __Buffer<T> {
-            Oneshot: ::core::pipes::Packet<Oneshot<T>>,
+            Oneshot: ::std::pipes::Packet<Oneshot<T>>,
         }
 
         #[allow(non_camel_case_types)]
         pub mod client {
 
-            priv use core::kinds::Send;
+            priv use std::kinds::Send;
 
             #[allow(non_camel_case_types)]
             pub fn try_send<T: Send>(pipe: Oneshot<T>, x_0: T) ->
-                ::core::option::Option<()> {
+                ::std::option::Option<()> {
                 {
                     use super::send;
                     let message = send(x_0);
-                    if ::core::pipes::send(pipe, message) {
-                        ::core::pipes::rt::make_some(())
-                    } else { ::core::pipes::rt::make_none() }
+                    if ::std::pipes::send(pipe, message) {
+                        ::std::pipes::rt::make_some(())
+                    } else { ::std::pipes::rt::make_none() }
                 }
             }
 
@@ -428,13 +428,13 @@ mod pipesy {
                 {
                     use super::send;
                     let message = send(x_0);
-                    ::core::pipes::send(pipe, message);
+                    ::std::pipes::send(pipe, message);
                 }
             }
 
             #[allow(non_camel_case_types)]
             pub type Oneshot<T> =
-                ::core::pipes::SendPacketBuffered<super::Oneshot<T>,
+                ::std::pipes::SendPacketBuffered<super::Oneshot<T>,
             super::__Buffer<T>>;
         }
 
@@ -442,7 +442,7 @@ mod pipesy {
         pub mod server {
             #[allow(non_camel_case_types)]
             pub type Oneshot<T> =
-                ::core::pipes::RecvPacketBuffered<super::Oneshot<T>,
+                ::std::pipes::RecvPacketBuffered<super::Oneshot<T>,
             super::__Buffer<T>>;
         }
     }
@@ -557,11 +557,11 @@ mod pipesy {
 
     #[allow(non_camel_case_types)]
     pub mod streamp {
-        priv use core::kinds::Send;
+        priv use std::kinds::Send;
 
         pub fn init<T: Send>() -> (server::Open<T>, client::Open<T>) {
-            pub use core::pipes::HasBuffer;
-            ::core::pipes::entangle()
+            pub use std::pipes::HasBuffer;
+            ::std::pipes::entangle()
         }
 
         #[allow(non_camel_case_types)]
@@ -569,18 +569,18 @@ mod pipesy {
 
         #[allow(non_camel_case_types)]
         pub mod client {
-            priv use core::kinds::Send;
+            priv use std::kinds::Send;
 
             #[allow(non_camel_case_types)]
             pub fn try_data<T: Send>(pipe: Open<T>, x_0: T) ->
-                ::core::option::Option<Open<T>> {
+                ::std::option::Option<Open<T>> {
                 {
                     use super::data;
-                    let (s, c) = ::core::pipes::entangle();
+                    let (s, c) = ::std::pipes::entangle();
                     let message = data(x_0, s);
-                    if ::core::pipes::send(pipe, message) {
-                        ::core::pipes::rt::make_some(c)
-                    } else { ::core::pipes::rt::make_none() }
+                    if ::std::pipes::send(pipe, message) {
+                        ::std::pipes::rt::make_some(c)
+                    } else { ::std::pipes::rt::make_none() }
                 }
             }
 
@@ -588,21 +588,21 @@ mod pipesy {
             pub fn data<T: Send>(pipe: Open<T>, x_0: T) -> Open<T> {
                 {
                     use super::data;
-                    let (s, c) = ::core::pipes::entangle();
+                    let (s, c) = ::std::pipes::entangle();
                     let message = data(x_0, s);
-                    ::core::pipes::send(pipe, message);
+                    ::std::pipes::send(pipe, message);
                     c
                 }
             }
 
             #[allow(non_camel_case_types)]
-            pub type Open<T> = ::core::pipes::SendPacket<super::Open<T>>;
+            pub type Open<T> = ::std::pipes::SendPacket<super::Open<T>>;
         }
 
         #[allow(non_camel_case_types)]
         pub mod server {
             #[allow(non_camel_case_types)]
-            pub type Open<T> = ::core::pipes::RecvPacket<super::Open<T>>;
+            pub type Open<T> = ::std::pipes::RecvPacket<super::Open<T>>;
         }
     }
 
diff --git a/src/libstd/num/strconv.rs b/src/libstd/num/strconv.rs
index ab17c5f175a47..8e7f49464ffc2 100644
--- a/src/libstd/num/strconv.rs
+++ b/src/libstd/num/strconv.rs
@@ -12,7 +12,7 @@
 
 use clone::Clone;
 use container::Container;
-use core::cmp::{Ord, Eq};
+use std::cmp::{Ord, Eq};
 use ops::{Add, Sub, Mul, Div, Rem, Neg};
 use option::{None, Option, Some};
 use char;
diff --git a/src/libstd/rt/context.rs b/src/libstd/rt/context.rs
index 09ba869549fd0..b30a55978f742 100644
--- a/src/libstd/rt/context.rs
+++ b/src/libstd/rt/context.rs
@@ -209,6 +209,6 @@ fn align_down(sp: *mut uint) -> *mut uint {
 // XXX: ptr::offset is positive ints only
 #[inline]
 pub fn mut_offset<T>(ptr: *mut T, count: int) -> *mut T {
-    use core::sys::size_of;
+    use std::sys::size_of;
     (ptr as int + count * (size_of::<T>() as int)) as *mut T
 }
diff --git a/src/libstd/std.rs b/src/libstd/std.rs
index 03b895b38601a..cbf00f43c61b9 100644
--- a/src/libstd/std.rs
+++ b/src/libstd/std.rs
@@ -206,16 +206,6 @@ pub mod rt;
 // 'std' so that macro-expanded references to std::error and such
 // can be resolved within libstd.
 #[doc(hidden)]
-mod core {
-    pub use clone;
-    pub use cmp;
-    pub use condition;
-    pub use option;
-    pub use kinds;
-    pub use sys;
-    pub use pipes;
-}
-#[doc(hidden)]
 mod std {
     pub use clone;
     pub use cmp;
diff --git a/src/libstd/trie.rs b/src/libstd/trie.rs
index df6f77fd6cef3..822b005de37a2 100644
--- a/src/libstd/trie.rs
+++ b/src/libstd/trie.rs
@@ -411,7 +411,7 @@ pub fn check_integrity<T>(trie: &TrieNode<T>) {
 #[cfg(test)]
 mod test_map {
     use super::*;
-    use core::option::{Some, None};
+    use option::{Some, None};
     use uint;
 
     #[test]