message
val message: String
message to be reported on usages of API without an explicit opt-in, or empty string for the default message. The default message is: "This declaration is experimental and its usage should be marked with 'Marker' or '@OptIn(Marker::class)'", where Marker is the opt-in requirement marker.
Property
 message - message to be reported on usages of API without an explicit opt-in, or empty string for the default message. The default message is: "This declaration is experimental and its usage should be marked with 'Marker' or '@OptIn(Marker::class)'", where Marker is the opt-in requirement marker.
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Licensed under the Apache License, Version 2.0.
    https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-requires-opt-in/message.html