F*: Verification system for effectful programs
More information on F* can be found at www.fstar-lang.org
The F* tutorial provides a first taste of verified programming in F*, explaining things by example.
The F* wiki contains additional, usually more in-depth, technical documentation on F*.
Editing F* code
You can edit F* code using your favourite text editor, but Emacs, Visual Studio Code, Atom, and Vim have extensions that add special support for F*, including for instance syntax highlighting, code completion, quick navigation, type hints, and interactive development. More details on editor support on the F* wiki.
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
More details on executing F* code via OCaml on the F* wiki.
Chatting about F* on Slack and Zulip
Users can also chat about F* or ask questions at this Zulip forum.
Community mailing list
The fstar-club mailing list is where various F* announcements are made to the general public (e.g. for releases, new papers, etc) and where users can ask questions, ask for help, discuss, provide feedback, announce jobs requiring at least 10 years of F* experience, etc. List archives are public and searchable, but only members can post. Join here!
The F* for the masses blog is also expected to become an important source of information and news on the F* project.
Please report issues using the F* issue tracker on GitHub.
Before filing please use 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