[ptx]

Kotlin has incremental compilation since 1.0.2 last year, both in IntelliJ and Gradle: https://blog.jetbrains.com/kotlin/2016/05/kotlin-1-0-2-is-he...

...and in Maven since 1.1.2: https://blog.jetbrains.com/kotlin/2017/04/kotlin-1-1-2-is-ou...