New upstream version 1.52.1+dfsg1

[rustc.git] / vendor / rustc-ap-rustc_ast / src / lib.rs

diff --git a/vendor/rustc-ap-rustc_ast/src/lib.rs b/vendor/rustc-ap-rustc_ast/src/lib.rs
new file mode 100644 (file)
index 0000000..ddf52ca
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+++ b/vendor/rustc-ap-rustc_ast/src/lib.rs
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+//! The Rust parser and macro expander.
+//!
+//! # Note
+//!
+//! This API is completely unstable and subject to change.
+
+#![doc(
+    html_root_url = "https://doc.rust-lang.org/nightly/nightly-rustc/",
+    test(attr(deny(warnings)))
+)]
+#![feature(box_syntax)]
+#![feature(box_patterns)]
+#![feature(const_fn)] // For the `transmute` in `P::new`
+#![feature(const_fn_transmute)]
+#![feature(const_panic)]
+#![feature(crate_visibility_modifier)]
+#![feature(label_break_value)]
+#![feature(nll)]
+#![feature(or_patterns)]
+#![recursion_limit = "256"]
+
+#[macro_use]
+extern crate rustc_macros;
+
+#[macro_export]
+macro_rules! unwrap_or {
+    ($opt:expr, $default:expr) => {
+        match $opt {
+            Some(x) => x,
+            None => $default,
+        }
+    };
+}
+
+pub mod util {
+    pub mod classify;
+    pub mod comments;
+    pub mod literal;
+    pub mod parser;
+}
+
+pub mod ast;
+pub mod attr;
+pub mod crate_disambiguator;
+pub mod entry;
+pub mod expand;
+pub mod mut_visit;
+pub mod node_id;
+pub mod ptr;
+pub mod token;
+pub mod tokenstream;
+pub mod visit;
+
+pub use self::ast::*;
+
+use rustc_data_structures::stable_hasher::{HashStable, StableHasher};
+
+/// Requirements for a `StableHashingContext` to be used in this crate.
+/// This is a hack to allow using the `HashStable_Generic` derive macro
+/// instead of implementing everything in librustc_middle.
+pub trait HashStableContext: rustc_span::HashStableContext {
+    fn hash_attr(&mut self, _: &ast::Attribute, hasher: &mut StableHasher);
+}
+
+impl<AstCtx: crate::HashStableContext> HashStable<AstCtx> for ast::Attribute {
+    fn hash_stable(&self, hcx: &mut AstCtx, hasher: &mut StableHasher) {
+        hcx.hash_attr(self, hasher)
+    }
+}