NoSuchMethod error when matching on a private inner class

[hamdiallam]

Compiler version: 3.0.1

Minimized code

Scastie Link: https://scastie.scala-lang.org/AL4lT7w7RIuGUBPnhoCoTA

object Monitor {
  def handle(exc: Exception, pf: PartialFunction[Throwable, Unit]): Unit = {
    pf.applyOrElse(exc, { (exc: Exception) =>
      ()
    })
  }
}

class Outer {
  private class MyExc extends Exception
  Monitor.handle(new MyExc, {
      case _: MyExc => println("here")
  })
}

object Main {
  def main(args: Array[String]): Unit = {
    new Test
  }
}

Output (Runtime, not compile time)

java.lang.NoSuchMethodError: Test$MyExc.Test$MyExc$$$outer()LTest;

Expectation

When the inner class is marked private, Dotty will not generate an outer method. Verified this in the byte code. Making MyExc public will have the outer method generated. However, even when private, the bytecode generated in the for the PartialFunctions applyOrElse needs access to the outer instance to when checking to MyExc

Works fine in Scala 2

[smarter]

Fixed in recent nightlies by #13124

[smarter]

(you can test the latest nightly by setting scalaVersion := "3.0.3-RC1-bin-20210803-010f8de-NIGHTLY")

[hamdiallam]

Ah thanks, i'll double check the nightlies and issues before creating