KMP Native: Backend Internal error: Exception during IR lowering

Kotlin 1.4.30 and Kotest 4.4.0

It works with JVM, Android, Linux and Windows targets. But with some Apple targets it is failing. The project only have a shouldDo function.

Stacktrace:

> Task :lib:linkDebugTestIosX64 FAILED
e: Compilation failed: Backend Internal error: Exception during IR lowering
File being compiled: /Users/runner/work/kotest/kotest/kotest-assertions/kotest-assertions-core/src/commonMain/kotlin/io/kotest/matchers/collections/decreasing.kt
The root cause java.lang.AssertionError was thrown at: org.jetbrains.kotlin.ir.overrides.FakeOverrideBuilderStrategy.fakeOverrideMember(IrOverridingUtil.kt:43)

 * Source files: 
 * Compiler version info: Konan: 1.4.30 / Kotlin: 1.4.30
 * Output kind: STATIC_CACHE

e: org.jetbrains.kotlin.backend.common.BackendException: Backend Internal error: Exception during IR lowering
File being compiled: /Users/runner/work/kotest/kotest/kotest-assertions/kotest-assertions-core/src/commonMain/kotlin/io/kotest/matchers/collections/decreasing.kt
The root cause java.lang.AssertionError was thrown at: org.jetbrains.kotlin.ir.overrides.FakeOverrideBuilderStrategy.fakeOverrideMember(IrOverridingUtil.kt:43)

[PaulWoitaschek]

This is a compiler bug. I narrowed it down to:

fun a() {
    b<Int> { _, _ -> 0 }
}

fun <T> b(c: Comparator<in T>) {
}

And reported it upstream: https://youtrack.jetbrains.com/issue/KT-44928

[JavierSegoviaCordoba]

Nice, I was going to check it today 😃