Racket v8.3

Racket version 8.3 is now available from https://download.racket-lang.org.

• Racket removes syntax arming and disarming in favor of a simpler system of protected syntax operations, along with other updates to the syntax system.
• DrRacket has improved support for custom #lang languages.
• Typed Racket improves precision for type-checking of non-polymorphic structures, existential types, and certain binding forms.
• Scribble HTML output gains a button to show / hide the table of contents on mobile platforms.
• Redex’s stepper’s GUI shows IO-judgment form rule names.
• Many bug fixes!

The following people contributed to this release:

Adam Zaiter, Alex Knauth, Alexis King, Ayman Osman, Ben Greenman, Bob Burger, Bogdan Popa, Brian Adkins, Cameron Moy, Carl Eastlund, Dan Holtby, Dominik Pantůček, Eli Barzilay, Ethan Leba, Fred Fu, Greg Hendershott, Gustavo Massaccesi, J. Ryan Stinnett, Jason Hemann, Jay McCarthy, Jesse Alama, Joel Dueck, John Clements, Jonathan Simpson, Kartik Sabharwal, Laurent Orseau, Lehua Ding, Maciej Barć, Marc Burns, Matthew Flatt, Matthias Felleisen, Michael Ballantyne, Mike Sperber, Noah Ma, Paulo Matos, Pavel Panchekha, Philip McGrath, Robby Findler, Ryan Culpepper, Ryan Sundberg, Sage Gerard, Sam Tobin-Hochstadt, Shu-Hung You, Sorawee Porncharoenwase, Stefan Schwarzer, Stephen De Gabrielle, Vincent St-Amour, William J. Bowman, minor-change, and yjqww6

Racket v8.2

Racket version 8.2 is now available from https://download.racket-lang.org.

• Racket CS improved the performance of large-integer arithmetic.
• Racket has improved support for layered and tethered installation.
• Racket CS supports nonatomic allocation via ffi/unsafe.
• Cross-compilation works fully with the raco cross tool, which is distributed separately as the “raco-cross” package.
• DrRacket has performance improvements when editing files with picts containing large bitmaps.
• Typed Racket more consistently refines field types of non-polymorphic structs.
• Printing of values is unified across the teaching language implementations and the stepper.

The following people contributed to this release:

Alex Harsányi, Alex Knauth, Amirouche, Andrew Mauer-Oats, Bob Burger, Bogdan Popa, Cameron Moy, Crystal Jacobs, Dale Vaillancourt, Diego A. Mundo, Fred Fu, Greg Hendershott, Gustavo Massaccesi, Jack Firth, Jamie Taylor, Jarhmander, Jason Hemann, Jay McCarthy, Jeffrey D. Swan, Jens Axel Søgaard, Jesse Alama, John Clements, Laurent Orseau, Lazerbeak12345, Matthew Flatt, Matthias Felleisen, Mike Sperber, Nada Amin, Noah Ma, Oscar Waddell, Paulo Matos, Pavel Panchekha, Philip McGrath, Ray Racine, Robby Findler, Ryan Culpepper, Sam Tobin-Hochstadt, Shu-Hung You, Sorawee Porncharoenwase, Stephen Chang, Thorsten Blum, Tony Garnock-Jones, WarGrey Gyoudmon Ju, William J. Bowman, Yu Fang, and minor-change.

Racket v8.1

Racket version 8.1 is now available from https://racket-lang.org/.

• DrRacket tabs can be dragged, and have new close buttons.

• Racket CS supports cross-compilation using raco exe.

• Racket CS supports Android on 32-bit and 64-bit ARM processors.

• The database library supports running queries in OS threads.

• Check-Syntax arrows correctly identify the definition site of
  identifiers with contracts.

• Racket CS performance has improved for structure predicates and
  accessors

• Racket CS is faster at multiplying extremely large numbers and
  dividing large integers.

• Racket CS allows callbacks to raise exceptions if they are annotated
  with #:callback-exns?.

• New ephemeron hash tables simplify the implementation of tables where
  keys can refer to values.

• Typed Racket supports for/foldr.

• The stepper works for #lang htdp/*sl.

• Struct signatures work for the ASL teaching language.

The following people contributed to this release:

Alex Harsányi, Alex Knauth, Alexander Shopov, Alexis King, Andrew
Mauer-Oats, Anish Athalye, Ben Greenman, Bert De Ketelaere, Bob Burger,
Bogdan Popa, Brian Adkins, Cameron Moy, David Van Horn, Dexter Lagan,
Dominik Pantůček, Fred Fu, Greg Hendershott, Gustavo Massaccesi, Hazel
Levine, Ismael Luceno, Jack Firth, Jarhmander, John Clements, Jörgen
Brandt, Laurent Orseau, Lazerbeak12345, Matthew Flatt, Matthias
Felleisen, Micah Cantor, Mike Sperber, Noah Ma, Patrick McCarty, Paulo
Matos, Pavel Panchekha, Philip McGrath, Philippe Meunier, R. Kent
Dybvig, Robby Findler, Ryan Culpepper, Ryan Kramer, Sam Tobin-Hochstadt,
Sergiu Ivanov, Shu-Hung You, Sorawee Porncharoenwase, Stephen De
Gabrielle, William J. Bowman, bmitc, xxyzz, yjqww6, and ymdarake.

Feedback Welcome!

Racket v8.0

Racket version 8.0 is now available from https://racket-lang.org/.

Racket 8.0 marks the first release where Racket CS is the default implementation. Creating, polishing, and adopting Racket CS has been a 4-year effort involving the entire Racket community. At this point, Racket CS is faster, easier to maintain and develop, and compatible with existing Racket programs. Racket CS will continue to improve, but at this point it is ready to be the primary variant of Racket for all Racketeers. More details about the current state of Racket CS are available in the recent blog post.

Other notable changes:

• Racket CS has better parallel garbage collection, a 10%–30% reduction in the size of generated code, and various targeted optimizations.

• A rewrite of the test-engine package allows the #lang versions of teaching languages to produce linked test-failure messages.

• The release comes with a new mark-up DSL for composing text to appear in the REPL (simple-tree-text-markup).

• Redex has an added define-overriding-judgment form and improved error source location reporting.

• Windows scrolling speed reflects the system preference.

• The db package uses the utf8mb4 charset for MySQL connections.

The following people contributed to this release:

Alex Harsányi, Alex Knauth, Alexander Shopov, Alexis King, Bert De Ketelaere, Bogdan Popa, Cameron Moy, David Van Horn, Davis Silverman, Dominik Pantůček, Florian Weimer, Fred Fu, Gustavo Massaccesi, Jack Firth, James Wilcox, Joel Dueck, John Clements, Jonathan Chan, Lîm Tsú-thuàn, Mark, Matthew Flatt, Matthias Felleisen, Michael Ballantyne, Mike Sperber, Paulo Matos, Pavel Panchekha, Peter Zhong, Phil Nguyen, Philip McGrath, Robby Findler, Ryan Culpepper, Sam Tobin-Hochstadt, Sergiu Ivanov, Shu-Hung You, Sorawee Porncharoenwase, Stefan Schwarzer, Stephen Chang, Stephen De Gabrielle, Walter H. Yang, WarGrey Gyoudmon Ju, kurinoku, xxyzz, and yjqww6