Jumping into a statement expression with goto or using a switch statement outside the statement expression with a case or default label inside the statement expression is not permitted.
不允许使用switch语句或是goto跳入到声明表达式中。
If a label value equals expression, execute its accompanying statement list.
如果标记的值等于表达式，则执行其相伴的语句列表。
If a label value equals expression, execute its accompanying statement list.
如果标记的值等于表达式，则执行其相伴的语句列表。
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