diff --git a/src/libcore/rt/io/file.rs b/src/libcore/rt/io/file.rs
index 85dc180452ff..1f61cf25fbdd 100644
--- a/src/libcore/rt/io/file.rs
+++ b/src/libcore/rt/io/file.rs
@@ -10,7 +10,7 @@
 
 use prelude::*;
 use super::support::PathLike;
-use super::{Reader, Writer, Seek, Close};
+use super::{Reader, Writer, Seek};
 use super::SeekStyle;
 
 /// # XXX
@@ -69,10 +69,6 @@ impl Seek for FileStream {
     fn seek(&mut self, _pos: i64, _style: SeekStyle) { fail!() }
 }
 
-impl Close for FileStream {
-    fn close(&mut self) { fail!() }
-}
-
 #[test]
 #[ignore]
 fn super_simple_smoke_test_lets_go_read_some_files_and_have_a_good_time() {
diff --git a/src/libcore/rt/io/mod.rs b/src/libcore/rt/io/mod.rs
index fea32bc5b750..d2249aad95ed 100644
--- a/src/libcore/rt/io/mod.rs
+++ b/src/libcore/rt/io/mod.rs
@@ -383,16 +383,7 @@ pub trait Writer {
     fn flush(&mut self);
 }
 
-/// I/O types that may be closed
-///
-/// Any further operations performed on a closed resource will raise
-/// on `io_error`
-pub trait Close {
-    /// Close the I/O resource
-    fn close(&mut self);
-}
-
-pub trait Stream: Reader + Writer + Close { }
+pub trait Stream: Reader + Writer { }
 
 pub enum SeekStyle {
     /// Seek from the beginning of the stream
diff --git a/src/libcore/rt/io/native/file.rs b/src/libcore/rt/io/native/file.rs
index e203df815f2f..31c90336a24c 100644
--- a/src/libcore/rt/io/native/file.rs
+++ b/src/libcore/rt/io/native/file.rs
@@ -40,10 +40,6 @@ impl Writer for FileDesc {
     fn flush(&mut self) { fail!() }
 }
 
-impl Close for FileDesc {
-    fn close(&mut self) { fail!() }
-}
-
 impl Seek for FileDesc {
     fn tell(&self) -> u64 { fail!() }
 
@@ -72,10 +68,6 @@ impl Writer for CFile {
     fn flush(&mut self) { fail!() }
 }
 
-impl Close for CFile {
-    fn close(&mut self) { fail!() }
-}
-
 impl Seek for CFile {
     fn tell(&self) -> u64 { fail!() }
     fn seek(&mut self, _pos: i64, _style: SeekStyle) { fail!() }
diff --git a/src/libcore/rt/io/net/tcp.rs b/src/libcore/rt/io/net/tcp.rs
index c95b4344fe75..00b48738d0bb 100644
--- a/src/libcore/rt/io/net/tcp.rs
+++ b/src/libcore/rt/io/net/tcp.rs
@@ -32,10 +32,6 @@ impl Writer for TcpStream {
     fn flush(&mut self) { fail!() }
 }
 
-impl Close for TcpStream {
-    fn close(&mut self) { fail!() }
-}
-
 pub struct TcpListener;
 
 impl TcpListener {
diff --git a/src/libcore/rt/io/net/udp.rs b/src/libcore/rt/io/net/udp.rs
index 1f1254a7029f..bb5457e334dd 100644
--- a/src/libcore/rt/io/net/udp.rs
+++ b/src/libcore/rt/io/net/udp.rs
@@ -32,10 +32,6 @@ impl Writer for UdpStream {
     fn flush(&mut self) { fail!() }
 }
 
-impl Close for UdpStream {
-    fn close(&mut self) { fail!() }
-}
-
 pub struct UdpListener;
 
 impl UdpListener {
diff --git a/src/libcore/rt/io/net/unix.rs b/src/libcore/rt/io/net/unix.rs
index f449a857467c..b85b7dd059d8 100644
--- a/src/libcore/rt/io/net/unix.rs
+++ b/src/libcore/rt/io/net/unix.rs
@@ -32,10 +32,6 @@ impl Writer for UnixStream {
     fn flush(&mut self) { fail!() }
 }
 
-impl Close for UnixStream {
-    fn close(&mut self) { fail!() }
-}
-
 pub struct UnixListener;
 
 impl UnixListener {
diff --git a/src/libcore/rt/io/stdio.rs b/src/libcore/rt/io/stdio.rs
index 26950986f7a0..247fe9544088 100644
--- a/src/libcore/rt/io/stdio.rs
+++ b/src/libcore/rt/io/stdio.rs
@@ -9,7 +9,7 @@
 // except according to those terms.
 
 use prelude::*;
-use super::{Reader, Writer, Close};
+use super::{Reader, Writer};
 
 pub fn stdin() -> StdReader { fail!() }
 
@@ -39,10 +39,6 @@ impl Reader for StdReader {
     fn eof(&mut self) -> bool { fail!() }
 }
 
-impl Close for StdReader {
-    fn close(&mut self) { fail!() }
-}
-
 pub struct StdWriter;
 
 impl StdWriter {
@@ -55,6 +51,3 @@ impl Writer for StdWriter {
     fn flush(&mut self) { fail!() }
 }
 
-impl Close for StdWriter {
-    fn close(&mut self) { fail!() }
-}