Ceylon M4 和 Ceylon IDE M4 发布

Ceylon M4 发布了，同时发布的还有  Ceylon IDE M4，这两个版本都要求 Java 7 的支持。预计明年 1 月份发布 Beta 版本。

该版本包含的新特性有：

• member class refinement (type families)
• class and interface aliases
• union and intersection aliases
• new syntax for package and module descriptors
• assertions
• condition lists
• support for calling super-interface implementations of refined members
• maven repositories
• pluggable command-line tools, git-style
• better support for optional types in Java
• JDK/Jigsaw modules
• all-new API doc redesign
• more than 300 features and bug fixes

Ceylon IDE M4 改进内容：

• support for JavaScript compilation and execution,
• module import completion,
• the brand new Ceylon Repository Explorer view,
• support for Maven repositories, and
• more than 30 other improvements and bug fixes.