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Both functions do some modifying of streams using `make_mut`: - `push` sometimes glues the first token of the next stream to the last token of the first stream. - `build` appends tokens to the first stream. By doing all of this in the one place, things are simpler. The first stream can be modified in both ways (if necessary) in the one place, and any next stream with the first token removed doesn't need to be stored. |
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| Cargo.toml | ||
| README.md | ||
The rustc_ast crate contains those things concerned purely with syntax
– that is, the AST ("abstract syntax tree"), along with some definitions for tokens and token streams, data structures/traits for mutating ASTs, and shared definitions for other AST-related parts of the compiler (like the lexer and macro-expansion).
For more information about how these things work in rustc, see the rustc dev guide: