Commit b1ef797
czg
修正序列(Range)关于类型限制与空区间判断的描述问题:修正了——字符和数字是 Rust 中仅有的可判空类型——的表述;补充了序列支持数字和字符是因为其具备连续步进特性(Step trait)的逻辑;澄清了空是指序列区间为空(如 5..1),而非类型本身是否为空。
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