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_patterns)]
12 #![cfg_attr(bootstrap, feature(const_fn_transmute))]
13 #![feature(crate_visibility_modifier)]
14 #![feature(if_let_guard)]
16 #![feature(label_break_value)]
18 #![feature(min_specialization)]
19 #![cfg_attr(bootstrap, allow(incomplete_features))] // if_let_guard
20 #![recursion_limit = "256"]
23 extern crate rustc_macros;
26 macro_rules! unwrap_or {
27 ($opt:expr, $default:expr) => {
55 pub use self::ast_like::AstLike;
57 use rustc_data_structures::stable_hasher::{HashStable, StableHasher};
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);
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)