ambiguous static forwarders for overridden methods

[raboof]

Compiler version

3.0.1-RC1

Minimized code

trait Super[T <: Number]:
  def get: T

class Sub extends Super[Integer]:
  override def get: Integer = ???

Output (OK?)

$ javap Sub.scala
public class Sub implements Super<java.lang.Integer> {
  public Sub();
  public java.lang.Integer get();
  public java.lang.Number get();
}

Expectation

That duplicate 'get' method seems suspicious to me, I had expected:

$ javap Sub.scala
public class Sub implements Super<java.lang.Integer> {
  public Sub();
  public java.lang.Integer get();
}

... however in fact both Scala and Java appear to select the correct method just fine.

Minimized code

Adding static object forwarders to the mix, however:

trait Super[T <: Number]:
  def get: T = ???

object Sub extends Super[Integer]:
  override def get: Integer = 37

Output

$ javap Sub.class
public final class Sub {
  public static java.lang.Integer get();
  public static java.lang.Number get();
}

Expectation

Here I expected:

$ javap Sub.class
public final class Sub {
  public static java.lang.Integer get();
}

And in this case it actually leads to a problem: while Scala code will not use these forwarders anyway, when using them from Java:

public class Use {
	public static void main(String... args) {
		System.out.println(Sub.get());
	}
}

I get a "reference to get is ambiguous" error from javac (tested with AdoptOpenJDK-11.0.11+9 - interestingly OpenJDK 1.8.0_272-b10 appears to select the right method just fine).

(of course this is a minimized example, but we see this problem when building Akka with Scala 3 and referring to Akka extensions from Java code)

[smarter]

Can you try with a nightly? (scalaVersion := "3.0.2-RC1-bin-20210708-7627583-NIGHTLY"), #12860 should have fixed this.

[raboof]

Can you try with a nightly? (scalaVersion := "3.0.2-RC1-bin-20210708-7627583-NIGHTLY"), #12860 should have fixed this.

Confirmed, both on the reproducer and on the Akka build!