Notice that there are two successful branches from the top rule expr.
注意,顶层规则expr有两个成功的分支.
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Splits the string EXPR into a list of strings and returns that list.
分割字符串EXPR为字符串列表并且返回这个列表.
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Forces EXPR to be interpreted in scalar context and returns the value of EXPR.
强制EXPR运行在标量上下文下并返回EXPR的值.
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