有一个嵌套的case语句, case语句本身没有问题, 但是总是编译不通过, 报错如下.
不只哪位大哥能给指个方向.
"case label value has already appeared in this switch at line 107"
"case label value has already appeared in this switch at line 108"
"case label value has already appeared in this switch at line 109"
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