}

    class CheckedResult<T : LanguageResult<*>>(val value: T)
}


internal
fun ElementResult<DataStatement>.asBlockElement(): BlockElement = when (this) {
    is Element -> element
    is FailingResult -> ErroneousStatement(this)
}


internal
fun <T : LanguageTreeElement> elementOrFailure(

        return LanguageTreeResult(
            imports = imports.filterIsInstance<Element<Import>>().map { it.element },
            topLevelBlock = Block(statements.map { it.asBlockElement() }, tree.rootSourceData()),
            headerFailures = headerFailures,
            codeFailures = collectFailures(statements)
        )
    }

    private