What's new

Language
- New syntax for backing field access
- Operators require a modifier (operator)
- Compile-time constants are prefixed with const
- Annotations on file classes supported
- private on the top level is now private to file
- internal is checked in the compiler (not only IDE)
- private in interfaces is truly private now
- equals in data classes compares arrays by calling their .equals() method (which works by identity)
- lateinit val‘s are prohibited
- many cases of inheritance and other degrees of freedom are prohibited for data classed (see this blog post)
- protected and internal members are prohibited in interfaces
- _, __, ___ are forbidden as in identifiers
- identityEquals() function is deprecated in favor of ===
Standard Library API subdivided into part classes such as CollectionsKt
IDE
- Introduce backing property refactoring
- Move property initializer to declaration refactoring
- Add unambiguous imports on-the-fly
- Completion for overridden members

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