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A Proof-oriented Programming Language

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F*: A Proof-oriented Programming Language
=========================================

### F\* website

More information on F\* can be found at www.fstar-lang.org

### Installation

See [INSTALL.md](https://github.com/FStarLang/FStar/blob/master/INSTALL.md)

### Online book

An online book _Proof-oriented Programming In F*_ is available and updates are
posted online periodically. The book is available as a [PDF], or you can read it while trying out
examples and exercises in your browser interface from this [tutorial page].

[tutorial page]: https://www.fstar-lang.org/tutorial/
[PDF]: http://fstar-lang.org/tutorial/proof-oriented-programming-in-fstar.pdf

### Editing F* code

You can edit F\* code using various text editors, with Emacs and VSCode currently having 
the most substantial support, including syntax highlighting, code completion and navigation,
and incremental, interactive development.

* [fstar-mode.el]: Emacs mode for F*
* [fstar-vscode-assistant]: VS Code plugin for F*

More details on [editor support] are available on the [F\* wiki].

[editor support]: https://github.com/FStarLang/FStar/wiki/Editor-support-for-F*
[fstar-mode.el]: https://github.com/FStarLang/fstar-mode.el
[fstar-vscode-assistant]: https://github.com/FStarLang/fstar-vscode-assistant

### AI Agents

AI agents are proficient at using F* and Pulse.

Especially if you are using Copilot CLI or Claude Code, we recommend installing the [proof-copilot] plugin, 
which provides agents and skills with prompts for specific features of the language and its tooling.

[proof-copilot]: https://github.com/FStarLang/proof-copilot

### Extracting and executing F* code

By default F* only verifies the input code, it does not compile or execute it.
To execute F* code one needs to translate it for instance to OCaml or F\#,
using F\*'s code extraction facility---this is invoked using the
command line argument `--codegen OCaml` or `--codegen FSharp`.
More details on [executing F\* code via OCaml] on the [F\* wiki].

[executing F\* code via OCaml]: https://github.com/FStarLang/FStar/wiki/Executing-F*-code

Also, code written in Pulse, a DSL in F* for concurrent, imperative programming,
can be extracted to C or Rust by the [KaRaMeL tool](https://github.com/FStarLang/karamel).

Additionally, code written in an ASM-like deeply embedded DSL can be extracted
to ASM by the [Vale tool](https://github.com/project-everest/vale).

### Chatting about F* on Zulip

F* developers and users can chat about F* or ask questions at this [Zulip
forum](https://fstar.zulipchat.com).

(An older forum on Slack is no longer used.)

### Reporting issues

Please report issues using the [F\* issue tracker] on GitHub.
Before filing please search to make sure the issue doesn't already exist.
We don't maintain old releases, so if possible please use the
[online F\* editor] or directly [the GitHub sources] to check
that your problem still exists on the `master` branch.

[F\* issue tracker]: https://github.com/FStarLang/FStar/issues
[online F\* editor]: https://www.fstar-lang.org/run.php
[the GitHub sources]: [https://github.com/FStarLang/FStar/blob/master/INSTALL.md#building-f-from-sources

### Other Documentation

The [F\* wiki] contains additional technical documentation on F\*, and is especially useful
for topics that are not yet covered by the book.

[F\* wiki]: https://github.com/FStarLang/FStar/wiki

### Contributing

See [CONTRIBUTING.md](https://github.com/FStarLang/FStar/blob/master/CONTRIBUTING.md)

### License

F* is released under the [Apache 2.0 license]; for more details
see [LICENSE](https://github.com/FStarLang/FStar/blob/master/LICENSE)

[Apache 2.0 license]: https://www.apache.org/licenses/LICENSE-2.0

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