# rascal

> The implementation of the Rascal meta-programming language (including interpreter, type checker, parser generator, compiler and JVM based run-time system)

- **URL**: https://www.freshcrate.ai/projects/rascal
- **Author**: usethesource
- **Category**: Prompt Engineering
- **Latest version**: `v0.42.2` (2026-04-14)
- **License**: NOASSERTION
- **Source**: https://github.com/usethesource/rascal
- **Homepage**: http://www.rascal-mpl.org
- **Language**: Java
- **GitHub**: 457 stars, 82 forks
- **Registry**: github
- **Tags**: `checker`, `code-generation`, `compiler`, `domain-specific-language`, `interpreter`, `java`, `language`, `metaprogramming`, `parser-generator`

## Description

The implementation of the Rascal meta-programming language (including interpreter, type checker, parser generator, compiler and JVM based run-time system)

## Recent releases

| Version | Date | Urgency | Changes |
| --- | --- | --- | --- |
| `v0.42.2` | 2026-04-14 | High | Latest release: v0.42.2 |
| `v0.42.1` | 2026-03-17 | Medium | Fixed 2 bugs:  - An type-checker error with parameterized types (https://github.com/usethesource/rascal/pull/2693) - Subtle errors caused by programmatic uses of doImport forgot to clear lookup caches afterwards, it fixes #2694 (https://github.com/usethesource/rascal/pull/2695) |
| `v0.42.0` | 2026-03-03 | Low | Read the full release notes here: https://www.rascal-mpl.org/release-notes/rascal-0-42-x-release-notes/ |
| `v0.41.3-RC1` | 2026-01-27 | Low | Release v0.41.3-RC1 |
| `v0.41.0` | 2025-12-19 | Low | Release v0.41.0 |
| `v0.41.1` | 2025-12-19 | Low | Release v0.41.1 |
| `v0.41.2` | 2025-12-17 | Low | The new latest release of rascal, please read the release-notes: https://www.rascal-mpl.org/release-notes/rascal-0-41-x-release-notes/ |
| `v0.40.17` | 2024-11-15 | Low | Newest release of rascal, containing a year of fixes and improvements, [read the release-notes for more details](https://www.rascal-mpl.org/release-notes/rascal-0-40-x-release-notes/) |
| `v0.34.1` | 2024-05-31 | Low | Release v0.34.1 |
| `v0.31.0` | 2023-06-29 | Low | Release v0.31.0 |

## Citation

- HTML: https://www.freshcrate.ai/projects/rascal
- Markdown: https://www.freshcrate.ai/projects/rascal.md
- Dependencies JSON: https://www.freshcrate.ai/api/projects/rascal/deps

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