lalrpop

LALRPOP's macros allow defining reusable grammar patterns like `Comma<Id>` for comma-separated lists, making grammars DRY and reducing boilerplate, as emphasized in the README.

It supports operators such as `*` and `?` directly in grammars for common repetition and optional patterns, simplifying syntax without extra action code.

Sensible defaults and type inference often let developers omit explicit action code and nonterminal types, streamlining grammar development and improving readability.

Provides helpful error messages when parser construction fails, aiding in debugging and making the framework more user-friendly, as noted in the key features.