1 files changed, 63 insertions, 0 deletions
diff --git a/compiler/rustc_ast/src/lib.rs b/compiler/rustc_ast/src/lib.rs
new file mode 100644
index 000000000..4b94ec0d6
--- /dev/null
+++ b/compiler/rustc_ast/src/lib.rs
@@ -0,0 +1,63 @@
+//! The Rust Abstract Syntax Tree (AST).
+//!
+//! # 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(associated_type_bounds)]
+#![feature(box_patterns)]
+#![feature(const_default_impls)]
+#![feature(const_trait_impl)]
+#![feature(if_let_guard)]
+#![feature(label_break_value)]
+#![feature(let_chains)]
+#![feature(min_specialization)]
+#![feature(negative_impls)]
+#![feature(slice_internals)]
+#![feature(stmt_expr_attributes)]
+#![recursion_limit = "256"]
+
+#[macro_use]
+extern crate rustc_macros;
+
+pub mod util {
+    pub mod classify;
+    pub mod comments;
+    pub mod literal;
+    pub mod parser;
+    pub mod unicode;
+}
+
+pub mod ast;
+pub mod ast_traits;
+pub mod attr;
+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::*;
+pub use self::ast_traits::{AstDeref, AstNodeWrapper, HasAttrs, HasNodeId, HasSpan, HasTokens};
+
+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 `rustc_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)
+    }
+}