We are happy to announce Kotlin 1.1.1 Release Candidate. The final release is coming soon. It includes several improvements and major fixes for compatibility issues. See full changelog here: https://github.com/JetBrains/kotlin/blob/1.1.1/ChangeLog.md#111-rc The IDEA plugin can be installed from the Kotlin-EAP 1.1 channel. For Gradle or Maven: Add

<http://dl.bintray.com/kotlin/kotlin-eap-1.1>

as a repository for the build script and your projects; use

1.1.1-eap-26

as the version number for the compiler and the standard library. The command-line compiler can be downloaded from the Github release page: https://github.com/JetBrains/kotlin/releases/tag/v1.1.1-rc