> This class can only be used with the compiler...

# announcements

[Marc Knaup]

This class can only be used with the compiler argument ‘-Xopt-in=kotlin.RequiresOptIn’

What is this warning for? I can use the class just fine even without that arguments 🤔
I guess the message is just misleading.

[randomcat]

I thought the compiler wouldn't let you name the type RequiresOptIn without that argument?

[Marc Knaup]

It probably depends on the annotations that requires opt-in. Whether they use warning or error level. ¯\_(ツ)_/¯

[randomcat]

oh TIL there's a level argument for that