buildScript("""
            ${constantServiceImpl("ConstantBuildService", "constant")}

            ${convertingValueSourceImpl("ConvertingValueSource", "ConstantBuildService", "String", "parameters.input.get().value")}
            def valueSource = providers.of(ConvertingValueSource) {
                parameters.input = gradle.sharedServices.registerIfAbsent("constant", ConstantBuildService) {}
            }