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diff --git a/ctr-std/src/sys/unix/ext/mod.rs b/ctr-std/src/sys/unix/ext/mod.rs
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+// Copyright 2014 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+//! Experimental extensions to `std` for Unix platforms.
+//!
+//! For now, this module is limited to extracting file descriptors,
+//! but its functionality will grow over time.
+//!
+//! # Example
+//!
+//! ```no_run
+//! use std::fs::File;
+//! use std::os::unix::prelude::*;
+//!
+//! fn main() {
+//!     let f = File::create("foo.txt").unwrap();
+//!     let fd = f.as_raw_fd();
+//!
+//!     // use fd with native unix bindings
+//! }
+//! ```
+
+#![stable(feature = "rust1", since = "1.0.0")]
+
+pub mod ffi;
+
+/// A prelude for conveniently writing platform-specific code.
+///
+/// Includes all extension traits, and some important type definitions.
+#[stable(feature = "rust1", since = "1.0.0")]
+pub mod prelude {
+    #[doc(no_inline)] #[stable(feature = "rust1", since = "1.0.0")]
+    pub use super::ffi::{OsStrExt, OsStringExt};
+}