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 #![cfg_attr(bootstrap, feature(label_break_value))]
  17 #![feature(let_chains)]
  18 #![cfg_attr(bootstrap, feature(let_else))]
  19 #![feature(min_specialization)]
  20 #![feature(negative_impls)]
  21 #![feature(slice_internals)]
  22 #![feature(stmt_expr_attributes)]
  23 #![recursion_limit = "256"]
  24 #![deny(rustc::untranslatable_diagnostic)]
  25 #![deny(rustc::diagnostic_outside_of_impl)]
  26
  27 #[macro_use]
  28 extern crate rustc_macros;
  29
  30 #[macro_use]
  31 extern crate tracing;
  32
  33 pub mod util {
  34     pub mod classify;
  35     pub mod comments;
  36     pub mod literal;
  37     pub mod parser;
  38     pub mod unicode;
  39 }
  40
  41 pub mod ast;
  42 pub mod ast_traits;
  43 pub mod attr;
  44 pub mod entry;
  45 pub mod expand;
  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
  56 use rustc_data_structures::stable_hasher::{HashStable, StableHasher};
  57
  58 /// Requirements for a `StableHashingContext` to be used in this crate.
  59 /// This is a hack to allow using the `HashStable_Generic` derive macro
  60 /// instead of implementing everything in `rustc_middle`.
  61 pub trait HashStableContext: rustc_span::HashStableContext {
  62     fn hash_attr(&mut self, _: &ast::Attribute, hasher: &mut StableHasher);
  63 }
  64
  65 impl<AstCtx: crate::HashStableContext> HashStable<AstCtx> for ast::Attribute {
  66     fn hash_stable(&self, hcx: &mut AstCtx, hasher: &mut StableHasher) {
  67         hcx.hash_attr(self, hasher)
  68     }
  69 }