Racket v8.12

---

• The "Die Macht der Abstraktion" language levels are no longer present,
  replaced by the "Schreibe dein Programm" language levels which have been
  available for several years. (see https://www.deinprogramm.de/sdp/ )

• The release fixes a problem with the binding structure of the for/fold
  form in the rare situation when an iteration clause identifier shadowed
  an accumulator identifier. This change may break code that depends on
  the old binding structure. (see https://docs.racket-lang.org/reference/for.html#%28form._%28%28lib._racket%2Fprivate%2Fbase..rkt%29._for%2Ffold%29%29 )

• Racket automatically sets the close-on-exec flag when opening a file, on
  systems where this is available. This change lowers the cost of avoiding
  problems that can occur when file descriptors become accidentally shared
  between processes. (see https://docs.racket-lang.org/reference/file-ports.html#%28def._%28%28lib._racket%2Fprivate%2Fbase..rkt%29._open-input-file%29%29 )

• Match includes hash and hash* patterns. (see https://docs.racket-lang.org/reference/match.html#%28form._%28%28lib._racket%2Fmatch..rkt%29._match%29%29 )

• The vector-set/copy function allows creation of a new vector that differs
  at only one index. This change also adds vector-append and vector-copy
  primitives. (see https://docs.racket-lang.org/reference/vectors.html#%28def._%28%28lib._racket%2Fvector..rkt%29._vector-set%2Fcopy%29%29 )

• The pregexp-quote function brings the functionality of regexp-quote
  to pregexps. (see https://docs.racket-lang.org/reference/regexp.html#%28def._%28%28lib._racket%2Fprivate%2Fbase..rkt%29._pregexp-quote%29%29 )

• The C FFI convention-based converter supports PascalCase and camelCase in
  addition to an underscore-based convention. (see https://docs.racket-lang.org/foreign/Defining_Bindings.html#%28form._%28%28lib._ffi%2Funsafe%2Fdefine%2Fconventions..rkt%29._convention~3ahyphen-~3ecamel.Case%29%29 )

• The racket/case library allows case-like forms that use different
  equality comparisons, such as eq? and equal-always?. (see https://docs.racket-lang.org/reference/case.html#%28form._%28%28lib._racket%2Fcase..rkt%29._case%2Fequal%29%29 )

• Scribble rendering to HTML adds linking and information buttons when
  hovering over heading titles.

• The interval-map data structure supports iterator functions in the style
  of gen:ordered-dict. (see https://docs.racket-lang.org/data/Orders_and_Ordered_Dictionaries.html#%28def._%28%28lib._data%2Forder..rkt%29._gen~3aordered-dict%29%29 )

The following people contributed to this release:

Alex Harsányi, Alex Knauth, Alex Muscar, Alexis King, Ben Greenman, Bert
De Ketelaere, Bob Burger, Bogdan Popa, Chris Payne, Fred Fu, J. Ryan
Stinnett, Jamie Taylor, Jared Forsyth, Jarhmander, Jens Axel Søgaard,
Joel Dueck, John Clements, Jordan Johnson, Ken Harris, Laurent Orseau,
Mao Yifu, Marc Nieper-Wißkirchen, Matteo d’Addio, Matthew Flatt,
Matthias Felleisen, Micah Cantor, Mike Sperber, naveen srinivasan, Oscar
Waddell, Philip McGrath, Philippe Meunier, Robby Findler, Rocketnia, Sam
Phillips, Sam Tobin-Hochstadt, Sarthak Shah, Shu-Hung You, Sorawee
Porncharoenwase, Stephen De Gabrielle, Tom Price, ur4t, Wing Hei Chan,
and ZhangHao

---