Racket 6.9 发布了，该版本包含如下改进内容： The official package catalog Web site is revised to have a new user experience. The Northwestern snapshot site keeps weekly snapshots going up to 12 weeks into the past. Those provide a middle ground for users who want access to new features earlier than stable releases, but want less churn than nightly builds. DrRacket provides a refactoring tool to remove unused requires in modules. DrRacket’s #lang-line customization support works better with buggy (i.e., in development) languages. The web server’s cookie libraries, including “id cookie” authentication, support RFC 6265. Thedblibrary supports PostgreSQL’s UUID type. Theracocommand lists matching commands when passed an ambiguous command prefix. The bytecode compiler detects more optimization opportunities for structure operations. Scribble can produce output via XeLaTeX as an alternative to LaTeX. Scribble supports theacmartLaTeX style, for use with ACM publications. Scribble supports the use of CJK characters in tags. 此外，修复了沙盒的安全问题，建议使用沙盒的用户尽快升级。 Racket源自著名的专家型语言PLT Scheme，同时又是Lisp语言的一个分支。它适用于从脚本Script到应用程序开发的任务执行工具，包括图形用户界面，Web服务器等。支持编译器的虚拟机，创建独立的可执行程序的工具，Racket Web服务器，具有丰富而全面的功能库，适用于初学者和专家编程。 Racket 6.9 发布，Lisp 语言分支下载地址
