# OCaml 5.2.0 — OCaml 5.2.0

- Product: OCaml (https://whatsnew.fyi/product/ocaml)
- Vendor: OCaml
- Date: 2024-05-13
- Version: 5.2.0
- Original notes: https://github.com/ocaml/ocaml/releases/tag/5.2.0
- Permalink: https://whatsnew.fyi/product/ocaml/releases/5.2.0

What's New is an index, not a publisher: every entry below links to the vendor's own release notes, which are the authoritative source. Entries are labelled where they are hand-curated sample data, pre-releases, or drawn from a secondary source such as a developer blog.

Reuse: the summaries, labels and curation here are © What's New. Quote freely with attribution and a link back; wholesale republication of the corpus is not permitted — terms: https://whatsnew.fyi/terms. The vendors' own release notes remain their publishers'.

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- **added** — Re-introduced GC compaction
- **added** — Restored native backend for POWER 64 bits
- **added** — Thread sanitizer support
- **added** — New Dynarray module
- **added** — New -H flag for hidden include directories
- **added** — Project-wide occurence metadata support for developer tools
- **added** — Raw identifiers
- **added** — Local open in type expressions
- **added** — Around 20 new functions in the standard library
- **changed** — Many fixes and improvements in the runtime
- **fixed** — Many bug fixes

OCaml 5.2.0 is still a somewhat experimental release compared to the OCaml 4.14 branch. Some of the highlights in OCaml 5.2.0 are:

- Re-introduced GC compaction
- Restored native backend for POWER 64 bits
- Thread sanitizer support
- New Dynarray module
- New -H flag for hidden include directories
- Project-wide occurence metadata support for developer tools
- Raw identifiers
- Local open in type expressions

And a lot of incremental changes:

- Around 20 new functions in the standard library
- Many fixes and improvements in the runtime
- Many bug fixes