How can I change the Kotlin compiler version on IntelliJ?

Question

In IntelliJ you can set the target Java version like this:

Unfortunately I don't see a place where I can do the same for Kotlin. This makes it not possible for me to use Quasar-Kotlin. I want to switch to M14 even though I have 1.0 beta installed. How can I change back?

After changing the build.gradle file back to M14 I am greeted with compilation errors in my project.

My build.gradle: https://gist.github.com/Jire/5b517fd767ad498bc18f

Answer 1

Go to Intellij Preferences -> Build, Execution, Deployment -> Kotlin Compiler. Update Language version and Api version to the one you wish.

(You can also use cmd + shift + A and type Kotlin Compiler to get to this preference)

Answer 2

You can't do this at the moment. Building your project in IntelliJ IDEA always uses the version of the Kotlin compiler bundled with the plugin, regardless of what your build.gradle file says. If you need to downgrade to M14, you need to install the M14 version of the plugin.