双重属格结构和部分所有格结构一直是语言文献争论的焦点之一。
Double genitive and possessive partitive constructions have long been debated over in literature.
在这两种语言容易出错的地方，Ceylon要求所有格有严格的块结构，取消了default所有格，保留了else块。
Where those two languages can be error prone, Ceylon forces a block structure on the cases and removes the default case in preference to an else block.
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