class PartialEvaluator(
    private val programKind: ProgramKind,
    private val programTarget: ProgramTarget
) {

    fun reduce(program: Program): ResidualProgram = when (program) {

        is Program.Empty -> reduceEmptyProgram()

        is Program.PluginManagement -> stage1WithPluginManagement(program)

        is Program.Buildscript -> reduceBuildscriptProgram(program)

        is Program.Plugins -> stage1WithPlugins(program)