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kotlinlang

How do we enable the new 2.1 experimental option for "when" guards? I couldn't find it in the KEEP or the "What's New".

if you try using them, the compiler should emit
```error: the feature "when guards" is experimental and should be enabled explicitly. This can be done by supplying the compiler argument '-Xwhen-guards', but note that no stability guarantees are provided.```

Thanks. I didn't see that because the error message in the IDE (IntelliJ IDEA 2024.3) only shows the first sentence.