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[rust.git] / compiler / rustc_ast / src / lib.rs
1 //! The Rust Abstract Syntax Tree (AST).
2 //!
3 //! # Note
4 //!
5 //! This API is completely unstable and subject to change.
6
7 #![doc(
8     html_root_url = "https://doc.rust-lang.org/nightly/nightly-rustc/",
9     test(attr(deny(warnings)))
10 )]
11 #![feature(associated_type_bounds)]
12 #![feature(box_patterns)]
13 #![feature(const_default_impls)]
14 #![feature(const_trait_impl)]
15 #![feature(if_let_guard)]
16 #![feature(let_chains)]
17 #![feature(min_specialization)]
18 #![feature(negative_impls)]
19 #![feature(slice_internals)]
20 #![feature(stmt_expr_attributes)]
21 #![recursion_limit = "256"]
22 #![deny(rustc::untranslatable_diagnostic)]
23 #![deny(rustc::diagnostic_outside_of_impl)]
24
25 #[macro_use]
26 extern crate rustc_macros;
27
28 #[macro_use]
29 extern crate tracing;
30
31 pub mod util {
32     pub mod case;
33     pub mod classify;
34     pub mod comments;
35     pub mod literal;
36     pub mod parser;
37     pub mod unicode;
38 }
39
40 pub mod ast;
41 pub mod ast_traits;
42 pub mod attr;
43 pub mod entry;
44 pub mod expand;
45 pub mod format;
46 pub mod mut_visit;
47 pub mod node_id;
48 pub mod ptr;
49 pub mod token;
50 pub mod tokenstream;
51 pub mod visit;
52
53 pub use self::ast::*;
54 pub use self::ast_traits::{AstDeref, AstNodeWrapper, HasAttrs, HasNodeId, HasSpan, HasTokens};
55 pub use self::format::*;
56
57 use rustc_data_structures::stable_hasher::{HashStable, StableHasher};
58
59 /// Requirements for a `StableHashingContext` to be used in this crate.
60 /// This is a hack to allow using the `HashStable_Generic` derive macro
61 /// instead of implementing everything in `rustc_middle`.
62 pub trait HashStableContext: rustc_span::HashStableContext {
63     fn hash_attr(&mut self, _: &ast::Attribute, hasher: &mut StableHasher);
64 }
65
66 impl<AstCtx: crate::HashStableContext> HashStable<AstCtx> for ast::Attribute {
67     fn hash_stable(&self, hcx: &mut AstCtx, hasher: &mut StableHasher) {
68         hcx.hash_attr(self, hasher)
69     }
70 }