After migrate I ve had a problem macOS target ```e Compilati

Question

After migrate I ve had a problem macOS target ```e Compilation failed Backend Internal error Exception during IR lowering File being compiled Users atomin Documents iq xpoint sdk sdk src commonMain kotlin com inventale xpoint sdk Checker 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 PROGRAM e org jetbrains kotlin backend common BackendException Backend Internal error Exception during IR lowering File being compiled Users atomin Documents iq xpoint sdk sdk src commonMain kotlin com inventale xpoint sdk Checker kt The root cause java lang AssertionError was thrown at org jetbrains kotlin ir overrides FakeOverrideBuilderStrategy fakeOverrideMember IrOverridingUtil kt 43 at org jetbrains kotlin backend common CodegenUtil reportBackendException CodegenUtil kt 239 at org jetbrains kotlin backend common CodegenUtil reportBackendException$default CodegenUtil kt 235 at org jetbrains kotlin backend common phaser PerformByIrFilePhase invoke PhaseBuilders kt 124 Caused by java lang AssertionError Unexpected variance in super type argument in 0 at org jetbrains kotlin ir overrides FakeOverrideBuilderStrategy fakeOverrideMember IrOverridingUtil kt 43 at org jetbrains kotlin ir overrides IrOverridingUtil buildFakeOverridesForClassUsingOverriddenSymbols IrOverridingUtil kt 168 at org jetbrains kotlin backend common ir IrUtilsKt addFakeOverrides IrUtils kt 487 at org jetbrains kotlin backend common ir IrUtilsKt addFakeOverrides$default IrUtils kt 485 ``` I can t share project source How can I fix the problem

aleksey.tomin · Answer

minimal code ``` private val actionsMap = AtomicReference mapOf lt String Action gt private fun getSortedActionList = actionsMap value values sortedWith a b gt a callTime compareTo b callTime ```

edrd · Answer

Looks like a bug Please report at <http kotl in issue|kotl in issue>

Paul Idstein · Answer

We ve seen the same stacktrace when switching to 1 4 30 Our issue was a lambda being assigned in an if else conditonal One lambda has a `error ` call the other not This lead to different functional interfaces and the override failed Kotlin 1 4 30 is really strict about generic types

aleksey.tomin · Answer

I ve created <https youtrack jetbrains com issue KT 45018>

aleksey.tomin · Answer

<https youtrack jetbrains com issue KT 44826> fixed for 1 4 31

edrd · Answer

Nice