// FILE: 1.kt

package test

inline fun a(s1: String = "s1", s2: String = "s2", body: (a1: String, a2: String) -> String) = body(s1, s2)

inline fun String.b(body: (a1: String, a2: String) -> String) = a(s2 = this,  body = body)

// FILE: 2.kt

import test.*

fun box(): String {
    val z = "OK".b { a, b ->
        a + b
    }

    return if (z == "s1OK") "OK" else "fail $z"
}