## Reproduction steps Scala version: 2.13.10 ```scala object A { def a(s: String): String = s"S: $s" } ``` ## Problem When trying to compile on JDK 20: ``` % java -version openjdk version "20" 2023-03-21 OpenJDK Runtime Environment Temurin-20+36 (build 20+36) OpenJDK 64-Bit Server VM Temurin-20+36 (build 20+36, mixed mode) % scala -version Scala code runner version 2.13.10 -- Copyright 2002-2022, LAMP/EPFL and Lightbend, Inc. % scalac -release:11 A.scala error: Error while emitting A$ Unsupported class file major version 64 1 error ``` Compiles just fine with Temuring 17 JDK. Platforms tested on: * macOS arm64