Expand description

The Rust Abstract Syntax Tree (AST).


This API is completely unstable and subject to change.


pub use self::ast::*;
pub use self::ast_traits::AstDeref;
pub use self::ast_traits::AstNodeWrapper;
pub use self::ast_traits::HasAttrs;
pub use self::ast_traits::HasNodeId;
pub use self::ast_traits::HasSpan;
pub use self::ast_traits::HasTokens;


The Rust abstract syntax tree module.

A set of traits implemented for various AST nodes, typically those used in AST fragments during macro expansion. The traits are not implemented exhaustively, only when actually necessary.

Functions dealing with attributes and meta items.

Definitions shared by macros / syntax extensions and e.g. rustc_middle.

A MutVisitor represents an AST modification; it accepts an AST piece and mutates it in place. So, for instance, macro expansion is a MutVisitor that walks over an AST and modifies it.

The AST pointer.

Token Streams

AST walker. Each overridden visit method has full control over what happens with its node, it can do its own traversal of the node’s children, call visit::walk_* to apply the default traversal algorithm, or prevent deeper traversal by doing nothing.



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.