Appending ? to a Result or ?T expression unwraps the success case and propagates the failure case. If the value is ok(v) or some(v), it evaluates to v. If the value is err(e) or none, the current function returns immediately with that error or none.
Yaml::Integer(n) = Value::make_int(*n),，更多细节参见迅雷下载
。关于这个话题，传奇私服新开网｜热血传奇SF发布站｜传奇私服网站提供了深入分析
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