Get exception tying to generate empty fun interface which inherit another interface with exact one abstract function

[jizoquval]

Describe the bug Using KotlinPoet 1.18.1 I get the exception: java.lang.IllegalStateException: Functional interfaces must have exactly one abstract function. Contained 0: [] when try to generate valid kotlin code. I'm trying to generate functional interface which doesn't contains new methods and inherits another functional interface with method declaration.

To Reproduce

    val bClassName = ClassName("","B")
    val aClassName = ClassName("","A")
    val fileSpec = FileSpec.builder("", "Example")
        .addType(
            TypeSpec.funInterfaceBuilder(bClassName)
                .addFunction(
                    FunSpec.builder("foo")
                        .addModifiers(KModifier.ABSTRACT)
                        .build(),
                )
                .build()
        )
        .addType(
            TypeSpec.funInterfaceBuilder(aClassName)
                .addSuperinterface(bClassName)
                .build()
        )
        .build()
    fileSpec.writeTo(System.out)

Expected behavior I expect to get generated code instead of exception.

Additional context This is a correct kotlin code and it can be compiled.

fun interface A: B

fun interface B {
  fun foo()
}