WojciechMazur commented on PR #1474:
URL: https://github.com/apache/pekko/pull/1474#issuecomment-2343546140
> Not immediately obvious to me. Maybe someone can narrow it down to a
minimal self-contained reproducer?
Here's further minimization using both contravariant and covaraint param
types
```scala
import scala.annotation.unchecked.uncheckedVariance
trait SubFlowDef[+F[+_]]
final class Flow1[-In]{
type Repr[+O] = Flow1[In @uncheckedVariance]
}
final class Flow2[+Out]{
type Repr[+O] = Flow2[O]
}
class SubFlow[In, Out](
delegate1: SubFlowDef[Flow1[In]#Repr],
delegate2: SubFlowDef[Flow2[Out]#Repr]
)
```
Signatures:
Scala 3.3.4-RC2 / 3.5.0
```scala
public SubFlow(SubFlowDef<?>, SubFlowDef<Flow2>);
descriptor: (LSubFlowDef;LSubFlowDef;)V
Signature: #9 //
(LSubFlowDef<*>;LSubFlowDef<LFlow2;>;)V
```
Scala 2.13
```scala
public SubFlow(SubFlowDef<?>, SubFlowDef<?>);
descriptor: (LSubFlowDef;LSubFlowDef;)V
Signature: #12 //
(LSubFlowDef<*>;LSubFlowDef<*>;)V
```
Scala 3.3.3
```scala
public SubFlow(SubFlowDef<Flow1<In>>, SubFlowDef<Flow2<java.lang.Object>>);
descriptor: (LSubFlowDef;LSubFlowDef;)V
Signature: #9 //
(LSubFlowDef<LFlow1<TIn;>;>;LSubFlowDef<LFlow2<Ljava/lang/Object;>;>;)V
```
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