kotlin-fork/js/js.translator/testFiles/extensionFunction/cases/virtualExtension.kt

package foo

class A(var a : Int) {

    fun Int.modify() : Int {
        return this * 3;
    }

    fun eval() = a.modify();
}

fun box(): Boolean {
    val a = A(4)
    return (a.eval() == 12)
}