Racket v9.2

posted by Stephen De Gabrielle and John Clements

We are pleased to announce Racket v9.2 is now available from https://download.racket-lang.org/.

As of this release:

• The match form checks that when non-linear patterns (patterns where the same variable is used multiple times) are used with ..., the two parts of the matched value actually are equal. Additionally, match rejects non-linear patterns where one use of the variable is used with ... and another is not. This repair could cause existing code to fail.
• Typed Racket’s types for the asin and acos procedures correctly handle situations where the function produces a complex number, avoiding unsound results that were previously possible. This repair could cause existing code to fail at compile time.
• The #%foreign-inline core syntactic form provides unsafe access to facilities provided at the linklet layer by a Racket implementation. This means that any code that handles all core forms by enumeration will need to be updated.
• Unicode 17.0 is used for character and string operations.
• This release includes internal support for a more static “ffi2” foreign interface (to be used in a future package).
• The terminal-file-position function counts bytes written to ports connected to a terminal, such as stdin and stderr.
• Cross-phase persistent modules allow more types of quoted data.
• The implementations of member, memw, when, unless, let/ec, and cond are rewritten to use only racket/kernel syntax
• The impersonator-property-predicate-procedure? function identifies procedures created by make-impersonator-property.
• In Typed Racket, polymorphic struct types are printed using type arguments (e.g., (Array Byte)) rather than exposing an internal representation.
• The stepper’s display of numbers better matches the language settings.
• Scribble documents that do not use the Racket-manual style get an initial-scale of 1.0, instead of the manual style’s 0.8, but this can be configured using the initial-scale property.
• By default, margin notes appear inline for narrow displays in all styles, not just in the Racket-manual style.
• Big-bang programs distributed as .dmg files correctly handle the close-on-stop feature.
• There are many other repairs and documentation improvements!

Thank you

The following people contributed to this release:

Alexander Shopov, Alexis King, Asilo, Bert De Ketelaere, Bob Burger, Bogdan Popa, Chung-chieh Shan, François-René Rideau, Gustavo Massaccesi, Ilya Klyuchnikov, Jade Sailor, Jamie Taylor, John Clements, Jonathan Simpson, LS_Hower, Matthew Flatt, Matthias Felleisen, Mike Sperber, Pavel Panchekha, Philippe Meunier, RMOlive, Robby Findler, Roman Klochkov, Sam Tobin-Hochstadt, Shu-Hung You, Stephen de Gabrielle, Tejas Sanap, 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.

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Racket - the Language-Oriented Programming Language - version 9.2 is now available from https://download.racket-lang.org

See https://blog.racket-lang.org/2026/05/racket-v9-2.html for the release announcement and highlights.