1 //! The "main crate" of the Rust compiler. This crate contains common
2 //! type definitions that are used by the other crates in the rustc
3 //! "family". Some prominent examples (note that each of these modules
4 //! has their own README with further details).
6 //! - **HIR.** The "high-level (H) intermediate representation (IR)" is
7 //! defined in the `hir` module.
8 //! - **MIR.** The "mid-level (M) intermediate representation (IR)" is
9 //! defined in the `mir` module. This module contains only the
10 //! *definition* of the MIR; the passes that transform and operate
11 //! on MIR are found in `rustc_const_eval` crate.
12 //! - **Types.** The internal representation of types used in rustc is
13 //! defined in the `ty` module. This includes the **type context**
14 //! (or `tcx`), which is the central context during most of
15 //! compilation, containing the interners and other things.
17 //! For more information about how rustc works, see the [rustc dev guide].
19 //! [rustc dev guide]: https://rustc-dev-guide.rust-lang.org/
23 //! This API is completely unstable and subject to change.
25 #![doc(html_root_url = "https://doc.rust-lang.org/nightly/nightly-rustc/")]
26 #![feature(allocator_api)]
27 #![feature(array_windows)]
28 #![feature(assert_matches)]
29 #![feature(box_patterns)]
30 #![feature(core_intrinsics)]
31 #![feature(discriminant_kind)]
32 #![feature(exhaustive_patterns)]
33 #![feature(generators)]
34 #![feature(get_mut_unchecked)]
35 #![feature(if_let_guard)]
36 #![feature(iter_from_generator)]
37 #![feature(negative_impls)]
38 #![feature(never_type)]
39 #![feature(extern_types)]
40 #![feature(new_uninit)]
41 #![feature(once_cell)]
42 #![feature(let_chains)]
43 #![feature(min_specialization)]
44 #![feature(trusted_len)]
45 #![feature(type_alias_impl_trait)]
46 #![feature(associated_type_bounds)]
47 #![feature(rustc_attrs)]
48 #![feature(control_flow_enum)]
49 #![feature(associated_type_defaults)]
50 #![feature(trusted_step)]
51 #![feature(try_blocks)]
52 #![feature(try_reserve_kind)]
53 #![feature(nonzero_ops)]
54 #![feature(unwrap_infallible)]
55 #![feature(decl_macro)]
56 #![feature(drain_filter)]
57 #![feature(intra_doc_pointers)]
58 #![feature(yeet_expr)]
59 #![feature(result_option_inspect)]
60 #![feature(const_option)]
61 #![recursion_limit = "512"]
62 #![allow(rustc::potential_query_instability)]
65 extern crate bitflags;
67 extern crate rustc_macros;
69 extern crate rustc_data_structures;
73 extern crate smallvec;
105 // Allows macros to refer to this crate as `::rustc_middle`
106 extern crate self as rustc_middle;