SAM-conversions only work for Java methods, not supported for Kotlin functions, because Kotlin has nice functional types, and there's no need for SAM conversion (in your case, I'd convert the lambda inside f2)
SAM-conversions only work for Java methods, not supported for Kotlin functions, because Kotlin has nice functional types, and there's no need for SAM conversion (in your case, I'd convert the lambda inside f2)