Racket 9.0 released

The Racket programming languageproject has released Racketversion 9.0. Racket is a descendant of Scheme, so it is part of the Lisp family of languages. The headline feature in the release is parallelthreads, which adds to the concurrency tools in the language: "WhileRacket has had green threads for some time, and supports parallelism viafutures and places, we feel parallel threads is a major addition."Other new features include the black-boxwrapper to prevent the compiler from optimizing calculations away, the decompile-linkletfunction to map linkletsback to an s-expression, theaddition of Weibulldistributions to the math library, and more.