return lex(source.text, *topLevelBlockIds).map { (comments, annotations, topLevelBlocks) ->

            checkForSingleBlocksOf(topLevelBlockIds, topLevelBlocks)

            checkForTopLevelBlockOrder(topLevelBlocks)

            val sourceWithoutComments =
                source.map { it.erase(comments) }

            val buildscriptFragment =
                topLevelBlocks

        val topLevelBlocks = extractPluginAndPluginManagementBlockFrom("plugins {} pluginManagement {}")
        try {
            checkForTopLevelBlockOrder(topLevelBlocks)
            fail("Expecting ${UnexpectedBlockOrder::class.simpleName}!")
        } catch (unexpectedBlock: UnexpectedBlockOrder) {
            assertThat(unexpectedBlock.identifier, equalTo(plugins))