Download Racket 6.9

Racket is a development language with which other development languages ​​can be developed. In addition, you can also simply develop in Racket itself. It was previously known as the PLT Scheme and comes from the Lisp-Scheme family. For the background we refer to the manifesto, written under the direction of Matthias Felleisen. The developers released version 6.9 of Racket a few days ago, with the following announcement:

Racket v6.9

Security Announcement
A security vulnerability in the racket/sandbox library and Typed Racket allowed malicious Typed Racket code to escape the sandbox. This vulnerability has been fixed in Racket version 6.9. Anyone using racket/sandbox to execute untrustworthy code with access to Typed Racket should upgrade to version 6.9 immediately. While this known vulnerability has been eliminated, it is possible that similar errors in other installed collections could also be exploited, although we are not currently aware of any existing vulnerabilities. We recommend that if you use the Racket sandbox to execute untrustworthy Racket code, you should also employ additional operating system or virtual machine level protections. The documentation for racket/sandbox has been updated to list recommended security practices for using the library. Thanks to Scott Moore for identifying this vulnerability.

• The official package catalog Web site has been revised to have a new user experience.
• The Northwestern snapshot site keeps weekly snapshots going up to 12 weeks into the past. Those provide a middle ground for users who want access to new features earlier than stable releases, but want less churn than nightly builds.
• DrRacket provides a refactoring tool to remove unused requires in modules.
• DrRacket’s #lang-line customization support works better with buggy (ie, in development) languages.
• The web server’s cookie libraries, including “id cookie” authentication, support RFC 6265.
• The db library supports PostgreSQL’s UUID type.
• The raco command lists matching commands when passed an ambiguous command prefix.
• The bytecode compiler detects more optimization opportunities for structure operations.
• Scribble can produce output via XeLaTeX as an alternative to LaTeX.
• Scribble supports the acmart LaTeX style, for use with ACM publications.
• Scribble supports the use of CJK characters in tags.

The following people contributed to this release: Alex Knauth, Alexander Shopov, Alexis King, Andrew Kent, Asumu Takikawa, Ben Greenman, Daniel Feltey, David Van Horn, Georges Dupéron, Greg Hendershott, Gustavo Massaccesi, Ingo Blechschmidt, James Bornholt, James Whang Jay McCarthy, Jeff Shelley, John Clements, Jordan Johnson, Leandro Facchinetti, Leif Andersen, Marc Burns, Matthew Butterick, Matthew Eric Bassett, Matthew Flatt, Matthias Felleisen, Michael Myers, Mike Sperber, Philip McGrath, Philippe Meunier, Robby Findler, Royall Spence, Ryan Culpepper, Sam Caldwell, Sam Tobin-Hochstadt, Shu-Hung You, Spencer Florence, Stephen Chang, Tony Garnock-Jones, Vincent St-Amour, WarGrey Gyoudmon Ju, Wei Tang, and William G Hatch.

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