diff --git a/src/libcore/rt/uv/file.rs b/src/libcore/rt/uv/file.rs
index 816a3a10a90..2d145055097 100644
--- a/src/libcore/rt/uv/file.rs
+++ b/src/libcore/rt/uv/file.rs
@@ -11,15 +11,11 @@
 use prelude::*;
 use ptr::null;
 use libc::c_void;
-use super::{UvError, Callback, Request, NativeHandle, Loop};
+use rt::uv::{Request, NativeHandle, Loop, FsCallback};
 use rt::uv::uvll;
 use rt::uv::uvll::*;
 
-pub type FsCallback = ~fn(FsRequest, Option<UvError>);
-impl Callback for FsCallback { }
-
 pub struct FsRequest(*uvll::uv_fs_t);
-
 impl Request for FsRequest;
 
 impl FsRequest {
diff --git a/src/libcore/rt/uv/idle.rs b/src/libcore/rt/uv/idle.rs
index aba5b3df937..fe1ce8697bf 100644
--- a/src/libcore/rt/uv/idle.rs
+++ b/src/libcore/rt/uv/idle.rs
@@ -9,17 +9,14 @@
 // except according to those terms.
 
 use libc::c_int;
-use option::{Option, Some, None};
+use option::{Some, None};
 use rt::uv::uvll;
-use rt::uv::{Watcher, Callback, Loop, UvError, NativeHandle};
+use rt::uv::{Watcher, Loop, NativeHandle, IdleCallback};
 use rt::uv::status_to_maybe_uv_error;
 
 pub struct IdleWatcher(*uvll::uv_idle_t);
 impl Watcher for IdleWatcher { }
 
-pub type IdleCallback = ~fn(IdleWatcher, Option<UvError>);
-impl Callback for IdleCallback { }
-
 pub impl IdleWatcher {
     fn new(loop_: &mut Loop) -> IdleWatcher {
         unsafe {
diff --git a/src/libcore/rt/uv/mod.rs b/src/libcore/rt/uv/mod.rs
index 79eda96a25f..2c83873359a 100644
--- a/src/libcore/rt/uv/mod.rs
+++ b/src/libcore/rt/uv/mod.rs
@@ -51,10 +51,9 @@ use rt::io::IoError;
 
 #[cfg(test)] use unstable::run_in_bare_thread;
 
-pub use self::file::{FsRequest, FsCallback};
+pub use self::file::FsRequest;
 pub use self::net::{StreamWatcher, TcpWatcher};
-pub use self::net::{ReadCallback, AllocCallback, ConnectionCallback, ConnectCallback};
-pub use self::idle::{IdleWatcher, IdleCallback};
+pub use self::idle::IdleWatcher;
 
 /// The implementation of `rtio` for libuv
 pub mod uvio;
@@ -66,11 +65,12 @@ pub mod file;
 pub mod net;
 pub mod idle;
 
-/// A trait for callbacks to implement. Provides a little extra type safety
-/// for generic, unsafe interop functions like `set_watcher_callback`.
-pub trait Callback { }
-
-pub trait Request { }
+/// XXX: Loop(*handle) is buggy with destructors. Normal structs
+/// with dtors may not be destructured, but tuple structs can,
+/// but the results are not correct.
+pub struct Loop {
+    handle: *uvll::uv_loop_t
+}
 
 /// The trait implemented by uv 'watchers' (handles). Watchers are
 /// non-owning wrappers around the uv handles and are not completely
@@ -80,8 +80,7 @@ pub trait Request { }
 /// entirely memory safe if used in unanticipated patterns.
 pub trait Watcher { }
 
-pub type NullCallback = ~fn();
-impl Callback for NullCallback { }
+pub trait Request { }
 
 /// A type that wraps a native handle
 pub trait NativeHandle<T> {
@@ -89,13 +88,6 @@ pub trait NativeHandle<T> {
     pub fn native_handle(&self) -> T;
 }
 
-/// XXX: Loop(*handle) is buggy with destructors. Normal structs
-/// with dtors may not be destructured, but tuple structs can,
-/// but the results are not correct.
-pub struct Loop {
-    handle: *uvll::uv_loop_t
-}
-
 pub impl Loop {
     fn new() -> Loop {
         let handle = unsafe { uvll::loop_new() };
@@ -121,6 +113,15 @@ impl NativeHandle<*uvll::uv_loop_t> for Loop {
     }
 }
 
+// XXX: The uv alloc callback also has a *uv_handle_t arg
+pub type AllocCallback = ~fn(uint) -> Buf;
+pub type ReadCallback = ~fn(StreamWatcher, int, Buf, Option<UvError>);
+pub type NullCallback = ~fn();
+pub type IdleCallback = ~fn(IdleWatcher, Option<UvError>);
+pub type ConnectionCallback = ~fn(StreamWatcher, Option<UvError>);
+pub type FsCallback = ~fn(FsRequest, Option<UvError>);
+
+
 /// Callbacks used by StreamWatchers, set as custom data on the foreign handle
 struct WatcherData {
     read_cb: Option<ReadCallback>,
diff --git a/src/libcore/rt/uv/net.rs b/src/libcore/rt/uv/net.rs
index 1209609347a..6261996a8b6 100644
--- a/src/libcore/rt/uv/net.rs
+++ b/src/libcore/rt/uv/net.rs
@@ -13,7 +13,8 @@ use libc::{size_t, ssize_t, c_int, c_void};
 use util::ignore;
 use rt::uv::uvll;
 use rt::uv::uvll::*;
-use super::{Loop, Watcher, Request, UvError, Buf, Callback, NativeHandle, NullCallback,
+use rt::uv::{AllocCallback, ConnectionCallback, ReadCallback};
+use super::{Loop, Watcher, Request, UvError, Buf, NativeHandle, NullCallback,
             status_to_maybe_uv_error, vec_to_uv_buf, vec_from_uv_buf, slice_to_uv_buf};
 use super::super::io::net::ip::{IpAddr, Ipv4, Ipv6};
 use rt::uv::last_uv_error;
@@ -48,13 +49,6 @@ fn ip4_as_uv_ip4<T>(addr: IpAddr, f: &fn(*sockaddr_in) -> T) -> T {
 pub struct StreamWatcher(*uvll::uv_stream_t);
 impl Watcher for StreamWatcher { }
 
-pub type ReadCallback = ~fn(StreamWatcher, int, Buf, Option<UvError>);
-impl Callback for ReadCallback { }
-
-// XXX: The uv alloc callback also has a *uv_handle_t arg
-pub type AllocCallback = ~fn(uint) -> Buf;
-impl Callback for AllocCallback { }
-
 pub impl StreamWatcher {
 
     fn read_start(&mut self, alloc: AllocCallback, cb: ReadCallback) {
@@ -165,9 +159,6 @@ impl NativeHandle<*uvll::uv_stream_t> for StreamWatcher {
 pub struct TcpWatcher(*uvll::uv_tcp_t);
 impl Watcher for TcpWatcher { }
 
-pub type ConnectionCallback = ~fn(StreamWatcher, Option<UvError>);
-impl Callback for ConnectionCallback { }
-
 pub impl TcpWatcher {
     fn new(loop_: &mut Loop) -> TcpWatcher {
         unsafe {
@@ -268,12 +259,8 @@ impl NativeHandle<*uvll::uv_tcp_t> for TcpWatcher {
     }
 }
 
-pub type ConnectCallback = ~fn(ConnectRequest, Option<UvError>);
-impl Callback for ConnectCallback { }
-
 // uv_connect_t is a subclass of uv_req_t
 struct ConnectRequest(*uvll::uv_connect_t);
-
 impl Request for ConnectRequest { }
 
 impl ConnectRequest {