// visible for testing
fun classFilePathCandidatesFor(sourceName: String): Sequence<String> =
    sourceName.replace(".", "/").let { path ->
        candidateClassFiles(path) + nestedClassFilePathCandidatesFor(path)
    }


private
fun nestedClassFilePathCandidatesFor(path: String): Sequence<String> =
    generateSequence({ nestedClassNameFor(path) }, ::nestedClassNameFor)
        .flatMap(::candidateClassFiles)


private