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I'm getting a `Unresolved reference: onEach` after updating to `1.1.2-4`. The code compiles and runs fine on `1.1.2-3`. Is that a known issue?

czyzby: This can happen if you have API version setting set to 1.0. It constrains you from using new API introduced in 1.1.
You can check its value in Kotlin facet of the module.

<@U0AAQKT9Q> The thing is: the only setting I change is the Kotlin version, so if the Gradle or IntelliJ plugins do not default to 1.0 API, I just don't see how this is the issue. I'm also getting some errors during coroutines usage after the update.

By the way, if you use coroutines, you should really update to 1.1.2-5, as -4 version has a serious flaw when compiling suspend functions

Yeah, I think I've encountered that issue - I had to change `suspendCoroutine` to `suspendCancellableCoroutine` to even make it work. I'll try `1.1.2-5`, thanks.

<@U0AAQKT9Q> I'm still getting that error for `onEach`. I've added this to my Gradle setup:
```
compileTestKotlin {
  kotlinOptions {
    languageVersion = "1.1"
  }
}
```
...but it still complains about unresolved reference.

This must be an IntelliJ issue, as it compiles just fine through Gradle.

Please check what is the _API version_ in Kotlin facet (Project Structure -&gt; Modules -&gt; Your module -&gt; Kotlin)

<@U0AAQKT9Q> Yes, that was the issue. What's the correct setup to achieve this? My main source modules default to 1.1 API level after Gradle import, but test modules are set as 1.0.

If you didn't set it explicitly in build.gradle it should be the same as the version of stdlib, namely 1.1. Is there any chance that you get kotlin-stdlib:1.0.x for tests?

Referenced by some of my dependencies, but not explicitly.

I mean, my Gradle script already includes the 1.1 as dependency.

```
testCompile("org.jetbrains.kotlin:kotlin-stdlib:$kotlinVersion") {
      force = true
    }
```

`kotlinVersion` is `1.1.2-5`. Test modules are still imported with 1.0 kotlin version.

<@U0AAQKT9Q> I had to remove all dependencies that used Kotlin 1.0 and reimport the project (Gradle refresh was not enough).

This may be fragile, and the problem can happen again when you add them back.
If you get correct compilation and incorrect diagnostics in IDE related to gradle import please report it as an issue, with the build.gradle attached.

This might have been a weird cache issue, I'm unable to reproduce it after complete removal of the IntelliJ meta-data folder from the project.

I'll create an issue if I ever encounter the problem again. Thanks.