kotlin/compiler/testData/codegen/box/inlineClasses/checkBoxingForComplexClassHierarchy.kt

// !LANGUAGE: +InlineClasses
// IGNORE_BACKEND_FIR: JVM_IR

inline class IC(val x: Int)

interface I<T> {
    fun foo(t: T): T
}

interface I2: I<IC>

open class A<T> {
    fun foo(t: T): T =
        if (t is IC)
            IC(20 + t.x) as T
        else
            t
}

open class B: A<IC>()
class C: I2, B()

fun box(): String {
    val ic = IC(10)
    val i: I<IC> = C()
    val i2: I2 = C()
    val a: A<IC> = C()
    val b: B = C()
    val c: C = C()

    val fooI = i.foo(ic).x
    if (fooI != 30) return "Fail I"

    // Test calling abstract fake override methods
    // with signature specialized by inline class
    val fooI2 = i2.foo(ic).x
    if (fooI2 != 30) return "Fail I2"

    val fooA = a.foo(ic).x
    if (fooA != 30) return "Fail A"

    val fooB = b.foo(ic).x
    if (fooB != 30) return "Fail B"

    val resC = c.foo(ic).x
    if (resC != 30) return "Fail C"

    return "OK"
}