https://blog.racket-lang.org/2025/05/racket-v8-17.html

 
[racket-log] Racket

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17 May 2025

Racket v8.17

posted by Stephen De Gabrielle

---------------------------------------------------------------------

We are pleased to announce Racket v8.17 is now available from https:/
/download.racket-lang.org/.

As of this release:

  * The new drracket-core package provides a version of drracket with
    a smaller set of dependencies.
  * Typed Racket has support for treelists.
  * The package manager computes checksums for packages when
    required, allowing the use and automatic upgrade of packages
    without them.
  * The bitwise-first-bit-set function returns the smallest bit that
    is set in the twos-complement representation of the given number.
  * The updated dynamic-require function makes it easier to use
    syntax bindings by allowing a syntax-thunk (or 'eval) to be used
    for them.
  * The error-module-path->string-handler parameter allows the
    customization of the display of module-paths in error messages.
  * Precision of certain numeric functions (sin, cos, and others) is
    improved on Windows platforms by using the MSVCRT/UCRT libraries.
  * The string-append function has improved performance and reduced
    memory use for long lists of strings in the Racket CS
    implementation. Differences are clearly noticeable for lists of
    length 1 million.
  * TCP ports use SO_KEEPALIVE, instructing the kernel to send
    periodic messages while waiting for data to check whether the
    connection is still responsive.
  * Racket code using a terminal in Windows can receive mouse events
    as virtual terminal characters after using SetConsoleMode. (This
    is also already possible on macOS and Linux.) See the tui-term
    package for related example code.
  * The #:replace-malformed-surrogate? keyword can be used to specify
    a replacement for malformed unicode surrogates in JSON input
  * The http-client module no longer sends "Content-Length: 0" for
    requests without a body.
  * The demodularizer (compiler/demod) can prune more unused
    assignments.
  * Several judgment rendering forms in Redex are replaced by
    functions, allowing more convenient abstraction.
  * When a distribution includes no teaching languages, DrRacket's
    language-dialog configuration moves into the preferences dialog
    and the "Language" menu disappears.
  * The math library has better support for block-diagonal matrices,
    including both Racket and Typed Racket.
  * The math library contains improved implementations of acos and
    matrix-(cos-)angle.
  * The stepper again works for big-bang programs.
  * There are many other repairs and documentation imprevements!

Thank you

The following people contributed to this release:

Alexander Shopov, Andrei Dorian Duma, Bert De Ketelaere, Bob Burger,
Bogdan Popa, Bogdana Vereha, Cameron Moy, Chung-chieh Shan, Cutie
Deng, D. Ben Knoble, Dario Hamidi, Dominik Pantucek, Gustavo
Massaccesi, halfminami, Jacqueline Firth, Jason Hemann, Jens Axel
Sogaard, Joel Dueck, John Clements, Jordan Harman, Marc
Nieper-Wisskirchen, Matthew Flatt, Matthias Felleisen, Mike Sperber,
Noah Ma, owaddell-ib, Philippe Meunier, Robby Findler, Ryan
Culpepper, Ryan Ficklin, Sam Phillips, Sam Tobin-Hochstadt, Shu-Hung
You, sogaiu, Sorawee Porncharoenwase, Stephen De Gabrielle, Vincent
Lee, and Wing Hei Chan.

Racket is a community developed open source project and we welcome
new contributors. See racket/README.md to learn how you can be a part
of this amazing project.

Feedback Welcome

Questions and discussion welcome at the Racket community on Discourse
or Discord.

Please share

If you can - please help get the word out to users and platform
specific repo packagers

Racket - the Language-Oriented Programming Language - version 8.17 is now available from https://download.racket-lang.org

See https://blog.racket-lang.org/2025/05/racket-v8-17.html for the release announcement and highlights.

prev Racket v8.16

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