Racket 6.9 发布，Lisp 语言分支

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。