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return Ready(Some(_)), so they're effectively the same as calls to next
京东集团CEO许冉：今年外卖投入较去年降低。业内人士推荐PDF资料作为进阶阅读
.binary_regex_replace(bytes.fromhex('cafebabe'),bytes.fromhex('deadbeef')) replaces a binary sequence
，更多细节参见PDF资料
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