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kotlinlang

If I'm on 2.2.21, is it safe to enable unnamed local variables? Or are there known issues for K/JS?

I don't know any specific issues for the JS target

This feature enables together with <https://github.com/Kotlin/KEEP/blob/main/proposals/KEEP-0412-unused-return-value-checker.md|Return Value Checker>, which is experimental since 2.3.
I can't guarantee that the implementation from 2.2.21 is ready to use (in a sense that there are no bugs and it's alligned with the final design).

```fun foo(): String = "hello"

fun test() {
    foo() // warning: result of `foo()` is not used
    val _ = foo() // green code
}```
The main use-case for them is to provide a syntax to "consume" the value which should be used but you actually don't want it.
For more details check the KEEP which I linked in the previous message.

Thank you! I'll just avoid it for now, and wait for an update to 2.3.0/10.
<@UKPEELJCW> can the new return value checker be turned off via compiler args btw?

<https://kotlinlang.org/docs/whatsnew-eap.html#unused-return-value-checker>