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uesowys
计算机科技研究员
5 年前
trueuesowys

A statement can include many expressions in syntax tree.
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Refer to the value from down to up in the same enclosing scope. The up-value will be shadowed by the down-value. That is,you can not cross the down-value to take the up-value when variables have the same name in the same enclosing scope.