warning: ATTENTION!
This build uses unsafe internal compiler arguments:

-XXLanguage:-SuspendFunctionAsSupertype

This mode is not recommended for production use,
as no stability/compatibility guarantees are given on
compiler or generated code. Use it at your own risk!

compiler/testData/cli/jvm/languageVersion.kt:5:23: error: KSuspendFunctionN interfaces are not allowed as supertypes
abstract class Some : KSuspendFunction0<Unit>
                      ^^^^^^^^^^^^^^^^^^^^^^^
COMPILATION_ERROR