1 //! The Rust parser and macro expander.
5 //! This API is completely unstable and subject to change.
8 html_root_url = "https://doc.rust-lang.org/nightly/nightly-rustc/",
9 test(attr(deny(warnings)))
11 #![feature(box_syntax)]
12 #![feature(box_patterns)]
13 #![cfg_attr(bootstrap, feature(const_fn))] // For the `transmute` in `P::new`
14 #![cfg_attr(not(bootstrap), feature(const_fn_unsize))] // For the `transmute` in `P::new`
15 #![feature(const_fn_transmute)]
16 #![feature(const_panic)]
17 #![feature(crate_visibility_modifier)]
19 #![feature(label_break_value)]
21 #![cfg_attr(bootstrap, feature(or_patterns))]
22 #![recursion_limit = "256"]
25 extern crate rustc_macros;
28 macro_rules! unwrap_or {
29 ($opt:expr, $default:expr) => {
57 pub use self::ast_like::AstLike;
59 use rustc_data_structures::stable_hasher::{HashStable, StableHasher};
61 /// Requirements for a `StableHashingContext` to be used in this crate.
62 /// This is a hack to allow using the `HashStable_Generic` derive macro
63 /// instead of implementing everything in `rustc_middle`.
64 pub trait HashStableContext: rustc_span::HashStableContext {
65 fn hash_attr(&mut self, _: &ast::Attribute, hasher: &mut StableHasher);
68 impl<AstCtx: crate::HashStableContext> HashStable<AstCtx> for ast::Attribute {
69 fn hash_stable(&self, hcx: &mut AstCtx, hasher: &mut StableHasher) {
70 hcx.hash_attr(self, hasher)