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diff --git a/compiler/rustc_trait_selection/src/lib.rs b/compiler/rustc_trait_selection/src/lib.rs
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+++ b/compiler/rustc_trait_selection/src/lib.rs
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+//! This crates defines the trait resolution method.
+//!
+//! - **Traits.** Trait resolution is implemented in the `traits` module.
+//!
+//! For more information about how rustc works, see the [rustc-dev-guide].
+//!
+//! [rustc-dev-guide]: https://rustc-dev-guide.rust-lang.org/
+//!
+//! # Note
+//!
+//! This API is completely unstable and subject to change.
+
+#![doc(html_root_url = "https://doc.rust-lang.org/nightly/nightly-rustc/")]
+#![feature(bool_to_option)]
+#![feature(box_patterns)]
+#![feature(drain_filter)]
+#![feature(hash_drain_filter)]
+#![feature(in_band_lifetimes)]
+#![feature(iter_zip)]
+#![feature(never_type)]
+#![feature(crate_visibility_modifier)]
+#![feature(control_flow_enum)]
+#![recursion_limit = "512"] // For rustdoc
+
+#[macro_use]
+extern crate rustc_macros;
+#[cfg(all(target_arch = "x86_64", target_pointer_width = "64"))]
+#[macro_use]
+extern crate rustc_data_structures;
+#[macro_use]
+extern crate tracing;
+#[macro_use]
+extern crate rustc_middle;
+#[macro_use]
+extern crate smallvec;
+
+pub mod autoderef;
+pub mod infer;
+pub mod opaque_types;
+pub mod traits;