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diff --git a/compiler/rustc_middle/src/lib.rs b/compiler/rustc_middle/src/lib.rs
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+//! The "main crate" of the Rust compiler. This crate contains common
+//! type definitions that are used by the other crates in the rustc
+//! "family". Some prominent examples (note that each of these modules
+//! has their own README with further details).
+//!
+//! - **HIR.** The "high-level (H) intermediate representation (IR)" is
+//!   defined in the `hir` module.
+//! - **MIR.** The "mid-level (M) intermediate representation (IR)" is
+//!   defined in the `mir` module. This module contains only the
+//!   *definition* of the MIR; the passes that transform and operate
+//!   on MIR are found in `librustc_mir` crate.
+//! - **Types.** The internal representation of types used in rustc is
+//!   defined in the `ty` module. This includes the **type context**
+//!   (or `tcx`), which is the central context during most of
+//!   compilation, containing the interners and other things.
+//!
+//! 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/")]
+#![feature(backtrace)]
+#![feature(bool_to_option)]
+#![feature(box_patterns)]
+#![feature(box_syntax)]
+#![feature(cmp_min_max_by)]
+#![feature(const_fn)]
+#![feature(const_panic)]
+#![feature(const_fn_transmute)]
+#![feature(core_intrinsics)]
+#![feature(discriminant_kind)]
+#![feature(drain_filter)]
+#![feature(never_type)]
+#![feature(exhaustive_patterns)]
+#![feature(extern_types)]
+#![feature(nll)]
+#![feature(option_expect_none)]
+#![feature(or_patterns)]
+#![feature(min_specialization)]
+#![feature(trusted_len)]
+#![feature(stmt_expr_attributes)]
+#![feature(test)]
+#![feature(in_band_lifetimes)]
+#![feature(crate_visibility_modifier)]
+#![feature(associated_type_bounds)]
+#![feature(rustc_attrs)]
+#![feature(hash_raw_entry)]
+#![feature(int_error_matching)]
+#![recursion_limit = "512"]
+
+#[macro_use]
+extern crate bitflags;
+#[macro_use]
+extern crate rustc_macros;
+#[macro_use]
+extern crate rustc_data_structures;
+#[macro_use]
+extern crate tracing;
+#[macro_use]
+extern crate smallvec;
+
+#[cfg(test)]
+mod tests;
+
+#[macro_use]
+mod macros;
+
+#[macro_use]
+pub mod query;
+
+#[macro_use]
+pub mod arena;
+pub mod dep_graph;
+pub mod hir;
+pub mod ich;
+pub mod infer;
+pub mod lint;
+pub mod middle;
+pub mod mir;
+pub mod traits;
+pub mod ty;
+
+pub mod util {
+    pub mod bug;
+    pub mod common;
+}
+
+// Allows macros to refer to this crate as `::rustc_middle`
+extern crate self as rustc_middle;