diff --git a/src/libstd/arc.rs b/src/libstd/arc.rs
index 3a9fd36a05e..9d15deab660 100644
--- a/src/libstd/arc.rs
+++ b/src/libstd/arc.rs
@@ -11,14 +11,9 @@ use private::{SharedMutableState, shared_mutable_state,
 use sync::{Mutex,  mutex_with_condvars,
               RWlock, rwlock_with_condvars};
 
-export ARC, clone, get;
-export Condvar;
-export MutexARC, mutex_arc_with_condvars, unwrap_mutex_arc;
-export RWARC, rw_arc_with_condvars, RWWriteMode, RWReadMode;
-export unwrap_rw_arc;
 
 /// As sync::condvar, a mechanism for unlock-and-descheduling and signalling.
-struct Condvar { is_mutex: bool, failed: &mut bool, cond: &sync::Condvar }
+pub struct Condvar { is_mutex: bool, failed: &mut bool, cond: &sync::Condvar }
 
 impl &Condvar {
     /// Atomically exit the associated ARC and block until a signal is sent.
@@ -71,7 +66,7 @@ impl &Condvar {
 struct ARC<T: Const Send> { x: SharedMutableState<T> }
 
 /// Create an atomically reference counted wrapper.
-fn ARC<T: Const Send>(+data: T) -> ARC<T> {
+pub fn ARC<T: Const Send>(+data: T) -> ARC<T> {
     ARC { x: unsafe { shared_mutable_state(move data) } }
 }
 
@@ -79,7 +74,7 @@ fn ARC<T: Const Send>(+data: T) -> ARC<T> {
  * Access the underlying data in an atomically reference counted
  * wrapper.
  */
-fn get<T: Const Send>(rc: &a/ARC<T>) -> &a/T {
+pub fn get<T: Const Send>(rc: &a/ARC<T>) -> &a/T {
     unsafe { get_shared_immutable_state(&rc.x) }
 }
 
@@ -90,7 +85,7 @@ fn get<T: Const Send>(rc: &a/ARC<T>) -> &a/T {
  * object. However, one of the `arc` objects can be sent to another task,
  * allowing them to share the underlying data.
  */
-fn clone<T: Const Send>(rc: &ARC<T>) -> ARC<T> {
+pub fn clone<T: Const Send>(rc: &ARC<T>) -> ARC<T> {
     ARC { x: unsafe { clone_shared_mutable_state(&rc.x) } }
 }
 
@@ -118,14 +113,14 @@ struct MutexARCInner<T: Send> { lock: Mutex, failed: bool, data: T }
 struct MutexARC<T: Send> { x: SharedMutableState<MutexARCInner<T>> }
 
 /// Create a mutex-protected ARC with the supplied data.
-fn MutexARC<T: Send>(+user_data: T) -> MutexARC<T> {
+pub fn MutexARC<T: Send>(+user_data: T) -> MutexARC<T> {
     mutex_arc_with_condvars(move user_data, 1)
 }
 /**
  * Create a mutex-protected ARC with the supplied data and a specified number
  * of condvars (as sync::mutex_with_condvars).
  */
-fn mutex_arc_with_condvars<T: Send>(+user_data: T,
+pub fn mutex_arc_with_condvars<T: Send>(+user_data: T,
                                     num_condvars: uint) -> MutexARC<T> {
     let data =
         MutexARCInner { lock: mutex_with_condvars(num_condvars),
@@ -196,7 +191,7 @@ impl<T: Send> &MutexARC<T> {
  * Will additionally fail if another task has failed while accessing the arc.
  */
 // FIXME(#2585) make this a by-move method on the arc
-fn unwrap_mutex_arc<T: Send>(+arc: MutexARC<T>) -> T {
+pub fn unwrap_mutex_arc<T: Send>(+arc: MutexARC<T>) -> T {
     let MutexARC { x: x } <- arc;
     let inner = unsafe { unwrap_shared_mutable_state(move x) };
     let MutexARCInner { failed: failed, data: data, _ } <- inner;
@@ -252,14 +247,14 @@ struct RWARC<T: Const Send> {
 }
 
 /// Create a reader/writer ARC with the supplied data.
-fn RWARC<T: Const Send>(+user_data: T) -> RWARC<T> {
+pub fn RWARC<T: Const Send>(+user_data: T) -> RWARC<T> {
     rw_arc_with_condvars(move user_data, 1)
 }
 /**
  * Create a reader/writer ARC with the supplied data and a specified number
  * of condvars (as sync::rwlock_with_condvars).
  */
-fn rw_arc_with_condvars<T: Const Send>(+user_data: T,
+pub fn rw_arc_with_condvars<T: Const Send>(+user_data: T,
                                        num_condvars: uint) -> RWARC<T> {
     let data =
         RWARCInner { lock: rwlock_with_condvars(num_condvars),
@@ -374,7 +369,7 @@ impl<T: Const Send> &RWARC<T> {
  * in write mode.
  */
 // FIXME(#2585) make this a by-move method on the arc
-fn unwrap_rw_arc<T: Const Send>(+arc: RWARC<T>) -> T {
+pub fn unwrap_rw_arc<T: Const Send>(+arc: RWARC<T>) -> T {
     let RWARC { x: x, _ } <- arc;
     let inner = unsafe { unwrap_shared_mutable_state(move x) };
     let RWARCInner { failed: failed, data: data, _ } <- inner;
@@ -395,10 +390,10 @@ fn borrow_rwlock<T: Const Send>(state: &r/mut RWARCInner<T>) -> &r/RWlock {
 // FIXME (#3154) ice with struct/&<T> prevents these from being structs.
 
 /// The "write permission" token used for RWARC.write_downgrade().
-enum RWWriteMode<T: Const Send> =
+pub enum RWWriteMode<T: Const Send> =
     (&mut T, sync::RWlockWriteMode, PoisonOnFail);
 /// The "read permission" token used for RWARC.write_downgrade().
-enum RWReadMode<T:Const Send> = (&T, sync::RWlockReadMode);
+pub enum RWReadMode<T:Const Send> = (&T, sync::RWlockReadMode);
 
 impl<T: Const Send> &RWWriteMode<T> {
     /// Access the pre-downgrade RWARC in write mode.
diff --git a/src/libstd/comm.rs b/src/libstd/comm.rs
index 58958d6115e..4bed7d13d0b 100644
--- a/src/libstd/comm.rs
+++ b/src/libstd/comm.rs
@@ -9,10 +9,8 @@ Higher level communication abstractions.
 
 use pipes::{Channel, Recv, Chan, Port, Selectable};
 
-export DuplexStream;
-
 /// An extension of `pipes::stream` that allows both sending and receiving.
-struct DuplexStream<T: Send, U: Send> {
+pub struct DuplexStream<T: Send, U: Send> {
     priv chan: Chan<T>,
     priv port: Port <U>,
 }
diff --git a/src/libstd/std.rc b/src/libstd/std.rc
index 13f7b967723..798ae4be6dd 100644
--- a/src/libstd/std.rc
+++ b/src/libstd/std.rc
@@ -74,11 +74,8 @@ mod cell;
 
 // Concurrency
 
-#[legacy_exports]
 mod sync;
-#[legacy_exports]
 mod arc;
-#[legacy_exports]
 mod comm;
 
 // Collections
diff --git a/src/libstd/sync.rs b/src/libstd/sync.rs
index c94a1ab46bf..2b2cd2b0ba7 100644
--- a/src/libstd/sync.rs
+++ b/src/libstd/sync.rs
@@ -7,9 +7,6 @@
  * in std.
  */
 
-export Condvar, Semaphore, Mutex, mutex_with_condvars;
-export RWlock, rwlock_with_condvars, RWlockReadMode, RWlockWriteMode;
-
 use private::{Exclusive, exclusive};
 
 /****************************************************************************
@@ -176,7 +173,7 @@ fn SemAndSignalRelease(sem: &r/Sem<~[mut Waitqueue]>)
 }
 
 /// A mechanism for atomic-unlock-and-deschedule blocking and signalling.
-struct Condvar { priv sem: &Sem<~[mut Waitqueue]>, drop { } }
+pub struct Condvar { priv sem: &Sem<~[mut Waitqueue]>, drop { } }
 
 impl &Condvar {
     /**
@@ -379,14 +376,14 @@ impl &Semaphore {
 struct Mutex { priv sem: Sem<~[mut Waitqueue]> }
 
 /// Create a new mutex, with one associated condvar.
-fn Mutex() -> Mutex { mutex_with_condvars(1) }
+pub fn Mutex() -> Mutex { mutex_with_condvars(1) }
 /**
  * Create a new mutex, with a specified number of associated condvars. This
  * will allow calling wait_on/signal_on/broadcast_on with condvar IDs between
  * 0 and num_condvars-1. (If num_condvars is 0, lock_cond will be allowed but
  * any operations on the condvar will fail.)
  */
-fn mutex_with_condvars(num_condvars: uint) -> Mutex {
+pub fn mutex_with_condvars(num_condvars: uint) -> Mutex {
     Mutex { sem: new_sem_and_signal(1, num_condvars) }
 }
 
@@ -429,13 +426,13 @@ struct RWlock {
 }
 
 /// Create a new rwlock, with one associated condvar.
-fn RWlock() -> RWlock { rwlock_with_condvars(1) }
+pub fn RWlock() -> RWlock { rwlock_with_condvars(1) }
 
 /**
  * Create a new rwlock, with a specified number of associated condvars.
  * Similar to mutex_with_condvars.
  */
-fn rwlock_with_condvars(num_condvars: uint) -> RWlock {
+pub fn rwlock_with_condvars(num_condvars: uint) -> RWlock {
     RWlock { order_lock: semaphore(1),
              access_lock: new_sem_and_signal(1, num_condvars),
              state: exclusive(RWlockInner { read_mode:  false,
@@ -646,9 +643,9 @@ fn RWlockReleaseDowngrade(lock: &r/RWlock) -> RWlockReleaseDowngrade/&r {
 }
 
 /// The "write permission" token used for rwlock.write_downgrade().
-struct RWlockWriteMode { /* priv */ lock: &RWlock, drop { } }
+pub struct RWlockWriteMode { /* priv */ lock: &RWlock, drop { } }
 /// The "read permission" token used for rwlock.write_downgrade().
-struct RWlockReadMode  { priv lock: &RWlock, drop { } }
+pub struct RWlockReadMode  { priv lock: &RWlock, drop { } }
 
 impl &RWlockWriteMode {
     /// Access the pre-downgrade rwlock in write mode.