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CSmlValue

sml

Struct CSmlValue 

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pub struct CSmlValue(/* private fields */);
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值树句柄。repr(transparent) 使其与内部 Value 布局一致， 从而可以把子值的 &Value 安全地重解释为此类型的借用指针。

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type Error = <U as TryFrom<T>>::Error

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