Racket v7.2

posted by Vincent St-Amour

Racket version 7.2 is now available from http://racket-lang.org/

Racket-on-Chez is done in a useful sense, but we’ll wait until it gets better before making it the default Racket implementation. For more information, see http://blog.racket-lang.org/2019/01/racket-on-chez-status.html

In addition, the Racket 7.2 release includes the following improvements, which apply to both implementations:

The contract system supports collapsible contracts, which avoid repeated wrappers in certain pathological situations. Thanks to Daniel Feltey.

Quickscript, a scripting tool for DrRacket, has become part of the standard distribution. Thanks to Laurent Orseau.

The web server’s built-in configuration for serving static files recognizes the ".mjs" extension for JavaScript modules.

The data/enumerate library supports an additional form of subtraction via but-not/e , following Yorgey and Foner’s ICFP’18 paper. Thanks to Max New.

The letrec.rkt example model in Redex has been changed to more closely match Racket, which led to some bug fixes in Racket’s implementation of letrec and set! .

The racklog library has seen a number of improvements, including fixes to logic variable binding, logic variables containing predicates being applicable, and the introduction of an %andmap higher-order predicate.

The following people contributed to this release: Akihide Nano, Alex Feldman-Crough, Alexander McLin, Alexander Shopov, Alexis King, Alex Knauth, Andrew Kent, Asumu Takikawa, Ben Greenman, Bogdan Popa, Caner Derici, Chongkai Zhu, Dan Feltey, Darren Newton, Gan Shen, Greg Hendershott, Gustavo Massaccesi, Jay McCarthy, Jens Axel Søgaard, John Clements, Jordan Johnson, Kevin Robert Stravers, Leif Andersen, Leo Uino, Matt Kraai, Matthew Butterick, Matthew Flatt, Matthias Felleisen, Max New, Michael Burge, Mike Sperber, Paul C. Anagnostopoulos, Paulo Matos, Philip McGrath, Robby Findler, Ronald Garcia, Ryan Culpepper, Ryan Kramer, Sam Tobin-Hochstadt, Shu-Hung You, Sorawee Porncharoenwase, Spencer Florence, Stephen Chang, and Vincent St-Amour

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