Copy makes it trivially easy to accidentally duplicate a Rust value that is actually a thin handle to a resource, resulting in null pointers. Just make a habit of avoiding it on exported wrappers. This can be a hard muscle memory to break since we usually want Copy wherever possible in normal Rust code.
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MIDI指南——这个开放且全面的MIDI控制码与参数库，早已突破了最初的设想边界。
这些歌曲具有共同特点：简单连复段、多为单音行进、集中指板特定区域。