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(const_fn)] // For the `transmute` in `P::new`
13 #![feature(const_fn_transmute)]
14 #![feature(const_panic)]
15 #![feature(crate_visibility_modifier)]
16 #![feature(iterator_fold_self)]
17 #![feature(label_break_value)]
19 #![feature(or_patterns)]
20 #![recursion_limit = "256"]
23 extern crate rustc_macros;
26 macro_rules! unwrap_or {
27 ($opt:expr, $default:expr) => {
55 use rustc_data_structures::stable_hasher::{HashStable, StableHasher};
57 /// Requirements for a `StableHashingContext` to be used in this crate.
58 /// This is a hack to allow using the `HashStable_Generic` derive macro
59 /// instead of implementing everything in librustc_middle.
60 pub trait HashStableContext: rustc_span::HashStableContext {
61 fn hash_attr(&mut self, _: &ast::Attribute, hasher: &mut StableHasher);
64 impl<AstCtx: crate::HashStableContext> HashStable<AstCtx> for ast::Attribute {
65 fn hash_stable(&self, hcx: &mut AstCtx, hasher: &mut StableHasher) {
66 hcx.hash_attr(self, hasher)