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diff --git a/third_party/rust/wasi/src/lib.rs b/third_party/rust/wasi/src/lib.rs
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+//! Raw API bindings to the WebAssembly System Interface (WASI)
+//!
+//! This crate provides Rust API bindings to WASI APIs. All WASI APIs are
+//! exported from this crate and provided with the appropriate type signatures.
+//! This crate is entirely procedurally generated from the `*.witx` files that
+//! describe the WASI API.
+//!
+//! # WASI API Version
+//!
+//! The WASI API is evolving over time. It is both gaining new features as well
+//! as tweaking the ABI of existing features. As a result it's important to
+//! understand what version of this crate you're using and how it relates to
+//! the WASI version of the spec.
+//!
+//! The WASI specification is organized into phases where there is a snapshot
+//! at any one point in time describing the current state of the specification.
+//! This crate implements a particular snapshot. You can find the snapshot
+//! version implemented in this crate in the build metadata of the crate
+//! version number. For example something like `0.9.0+wasi-snapshot-preview1`
+//! means that this crate's own personal version is 0.9.0 and it implements the
+//! `wasi-snapshot-preview1` snapshot. A major release of this crate (i.e.
+//! bumping the "0.9.0") is expected whenever the generated code changes
+//! or a new WASI snapshot is used.
+//!
+//! # Crate Features
+//!
+//! This crate supports one feature, `std`, which implements the standard
+//! `Error` trait for the exported [`Error`] type in this crate. This is
+//! enabled by default but can be disabled to make the library `no_std`
+//! compatible.
+
+#![no_std]
+
+mod lib_generated;
+pub use lib_generated::*;
+
+/// Special `Dircookie` value indicating the start of a directory.
+pub const DIRCOOKIE_START: Dircookie = 0;
+
+/// The "standard input" descriptor number.
+pub const FD_STDIN: Fd = 0;
+
+/// The "standard output" descriptor number.
+pub const FD_STDOUT: Fd = 1;
+
+/// The "standard error" descriptor number.
+pub const FD_STDERR: Fd = 2;