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diff --git a/third_party/rust/tokio/src/prelude.rs b/third_party/rust/tokio/src/prelude.rs
new file mode 100644
index 0000000000..1909f9da6a
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+++ b/third_party/rust/tokio/src/prelude.rs
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+#![cfg(not(loom))]
+
+//! A "prelude" for users of the `tokio` crate.
+//!
+//! This prelude is similar to the standard library's prelude in that you'll
+//! almost always want to import its entire contents, but unlike the standard
+//! library's prelude you'll have to do so manually:
+//!
+//! ```
+//! # #![allow(warnings)]
+//! use tokio::prelude::*;
+//! ```
+//!
+//! The prelude may grow over time as additional items see ubiquitous use.
+
+pub use crate::io::{self, AsyncBufRead, AsyncRead, AsyncWrite};
+
+cfg_io_util! {
+    #[doc(no_inline)]
+    pub use crate::io::{AsyncBufReadExt as _, AsyncReadExt as _, AsyncSeekExt as _, AsyncWriteExt as _};
+}