diff --git a/src/libstd/comm.rs b/src/libstd/comm.rs
index f4917934acb4..dc0fbbac6412 100644
--- a/src/libstd/comm.rs
+++ b/src/libstd/comm.rs
@@ -23,13 +23,6 @@ use core::pipes;
 use core::prelude::*;
 
 /// An extension of `pipes::stream` that allows both sending and receiving.
-#[cfg(stage0)]
-pub struct DuplexStream<T:Owned, U:Owned> {
-    priv chan: Chan<T>,
-    priv port: Port<U>,
-}
-#[cfg(stage1)]
-#[cfg(stage2)]
 pub struct DuplexStream<T, U> {
     priv chan: Chan<T>,
     priv port: Port<U>,
diff --git a/src/libstd/workcache.rs b/src/libstd/workcache.rs
index 81285e5e5635..f9a2f934e46e 100644
--- a/src/libstd/workcache.rs
+++ b/src/libstd/workcache.rs
@@ -167,20 +167,6 @@ struct Database {
 }
 
 impl Database {
-    #[cfg(stage0)]
-    #[cfg(stage1)]
-    fn prepare(&mut self, fn_name: &str,
-               declared_inputs: &WorkMap) -> Option<(WorkMap, WorkMap, ~str)>
-    {
-        let k = json_encode(&(fn_name, declared_inputs));
-        let db_cache = copy self.db_cache;
-        match db_cache.find(&k) {
-            None => None,
-            Some(&v) => Some(json_decode(copy v))
-        }
-    }
-
-    #[cfg(stage2)]
     fn prepare(&mut self, fn_name: &str,
                declared_inputs: &WorkMap) -> Option<(WorkMap, WorkMap, ~str)>
     {
@@ -235,13 +221,6 @@ struct Exec {
     discovered_outputs: WorkMap
 }
 
-#[cfg(stage0)]
-struct Work<T:Owned> {
-    prep: @Mut<Prep>,
-    res: Option<Either<T,PortOne<(Exec,T)>>>
-}
-#[cfg(stage1)]
-#[cfg(stage2)]
 struct Work<T> {
     prep: @Mut<Prep>,
     res: Option<Either<T,PortOne<(Exec,T)>>>