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import java.util.*
 
fun main(args: Array<String>) {
    println("aaaab".replace("b",fun(mr:MatchResult):CharSequence{return "x"}))
}

JNA Warning: IOException removing temporary files: JNA temporary directory '/tmp' is not writable
prog.kt:4:21: error: none of the following functions can be called with the arguments supplied: 
@InlineOnly public inline fun CharSequence.replace(regex: Regex, noinline transform: (MatchResult) -> CharSequence): String defined in kotlin.text
@InlineOnly public inline fun CharSequence.replace(regex: Regex, replacement: String): String defined in kotlin.text
public fun String.replace(oldChar: Char, newChar: Char, ignoreCase: Boolean = ...): String defined in kotlin.text
public fun String.replace(oldValue: String, newValue: String, ignoreCase: Boolean = ...): String defined in kotlin.text
    println("aaaab".replace("b",fun(mr:MatchResult):CharSequence{return "x"}))
                    ^

Standard output is empty