Racket v9.2

# Racket v9.2 Source: [https://blog.racket-lang.org/2026/05/racket-v9-2.html](https://blog.racket-lang.org/2026/05/racket-v9-2.html) *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/](https://download.racket-lang.org/)\. ## As of this release: - The[`match`](https://docs.racket-lang.org/reference/match.html#%28form._%28%28lib._racket%2Fmatch..rkt%29._match%29%29)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](https://github.com/racket/racket/pull/5467)\. - 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](https://github.com/racket/typed-racket/pull/1428)\. - The[`\#%foreign\-inline`](https://docs.racket-lang.org/reference/foreign-inline.html#%28form._%28%28quote._~23~25kernel%29._~23~25foreign-inline%29%29)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`](https://docs.racket-lang.org/reference/port-buffers.html#%28def._%28%28quote._~23~25kernel%29._terminal-file-position%29%29)function counts bytes written to ports connected to a terminal, such as`stdin`and`stderr`\. - Cross\-phase persistent modules allow more types of`quote`d data\. - The implementations of`member`,`memw`,`when`,`unless`,`let/ec`, and`cond`are rewritten to use only[`racket/kernel`](https://docs.racket-lang.org/reference/Kernel_Forms_and_Functions.html)syntax - The[`impersonator\-property\-predicate\-procedure?`](https://docs.racket-lang.org/reference/chaperones.html#%28def._%28%28quote._~23~25kernel%29._impersonator-property-predicate-procedure~3f%29%29)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`](https://docs.racket-lang.org/scribble/core.html#%28def._%28%28lib._scribble%2Fhtml-properties..rkt%29._initial-scale%29%29)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](https://github.com/racket/racket/blob/master/README.md#contributing)to learn how you can be a part of this amazing project\. ## Feedback Welcome Questions and discussion welcome at the Racket community on[Discourse](https://racket.discourse.group/invites/VxkBcXY7yL)or[Discord](https://discord.gg/6Zq8sH5)\. If you can \- please help get the word out to users and platform specific repo packagers ``` 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. ```