Issue #13622 has been reported by sergzhum (Sergey Zhumatiy).

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Misc #13622: Documentation missing
https://bugs.ruby-lang.org/issues/13622

* Author: sergzhum (Sergey Zhumatiy)
* Status: Open
* Priority: Normal
* Assignee: 
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In documentation for method IO.nread important information is missing: you must do 'require "io/wait"' before using it. May be some other methods of IO in 'io/wait' are missed this IMPORTANT notice.



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