Kotlin 1.2.30 EAP


We’re happy to announce the EAP for Kotlin 1.2.30!

What’s new

This release contains:

  • New feature in kapt: mapDiagnosticLocations flag, which will output proper links to .kt-files in case of error during annotation processing. You can try it in your Gradle-build:

    kapt {
        mapDiagnosticLocations = true
  • New declaration in stdlib (KT-22766), which should imitate suspend modifier for lambda literal:

public inline fun <R> suspend(noinline block: suspend () -> R): suspend () -> R = block
  • Support of TestNG in kotlin.test (KT-22620) — thanks to our kontributor, Valeriy Zhirnov!
  • Optimization of JVM bytecode generated for withIndex()-loops (KT-5177)
  • Support of “Analyze Data Flow …” feature for mixed Java and Kotlin (KT-16833)
  • A lot of new inspections and intentions in the IntelliJ plugin
  • A lot of improvements in Rename/Move refactorings in the IntellijPlugin
  • Bug fixes in the compiler and IDE
  • Performance improvements in the IntelliJ plugin

See full changelog for details

How to get EAP build

For IntelliJ IDEA:

You can configure Early Access Preview channel in Tools → Kotlin → Configure Kotlin Plugin Updates. Change the update channel to “Early Access Preview 1.2.x” and press Check for updates now.

For Gradle or Maven:

Add https://dl.bintray.com/kotlin/kotlin-eap to your repositories.
We recall that since 1.2.20, eap artifacts will be published only to kotlin-eap bintray channel.

Change the version of Kotlin dependencies (compiler and stdlib) to 1.2.30-eap-47

Please do provide feedback and report any issues to our issue tracker (please specify your plugin version and IDE version).

pinned #2


As noted here https://youtrack.jetbrains.com/issue/KT-21303 JUnit 5 now is building on JDK 10-ea again – with Kotlin support. Cheers!


New EAP build 1.2.30-eap-47 is available. Open-post has been updated, see also changelog for full details.

pinned #5