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(label_break_value)]
  17 #![feature(let_chains)]
  18 #![feature(min_specialization)]
  19 #![feature(negative_impls)]
  20 #![feature(slice_internals)]
  21 #![feature(stmt_expr_attributes)]
  22 #![recursion_limit = "256"]
  23
  24 #[macro_use]
  25 extern crate rustc_macros;
  26
  27 pub mod util {
  28     pub mod classify;
  29     pub mod comments;
  30     pub mod literal;
  31     pub mod parser;
  32     pub mod unicode;
  33 }
  34
  35 pub mod ast;
  36 pub mod ast_traits;
  37 pub mod attr;
  38 pub mod entry;
  39 pub mod expand;
  40 pub mod mut_visit;
  41 pub mod node_id;
  42 pub mod ptr;
  43 pub mod token;
  44 pub mod tokenstream;
  45 pub mod visit;
  46
  47 pub use self::ast::*;
  48 pub use self::ast_traits::{AstDeref, AstNodeWrapper, HasAttrs, HasNodeId, HasSpan, HasTokens};
  49
  50 use rustc_data_structures::stable_hasher::{HashStable, StableHasher};
  51
  52 /// Requirements for a `StableHashingContext` to be used in this crate.
  53 /// This is a hack to allow using the `HashStable_Generic` derive macro
  54 /// instead of implementing everything in `rustc_middle`.
  55 pub trait HashStableContext: rustc_span::HashStableContext {
  56     fn hash_attr(&mut self, _: &ast::Attribute, hasher: &mut StableHasher);
  57 }
  58
  59 impl<AstCtx: crate::HashStableContext> HashStable<AstCtx> for ast::Attribute {
  60     fn hash_stable(&self, hcx: &mut AstCtx, hasher: &mut StableHasher) {
  61         hcx.hash_attr(self, hasher)
  62     }
  63 }