This module can be included in any Exception subclass that is used to wrap some system error (Errno or WinError)
When included it provides a from_errno method (and from_winerror on Windows) to create exception instances with a description of the original error. It also adds an #os_error property that contains the original system error.
For example:
class MyError < Exception
include SystemError
end
MyError.from_errno("Something happened")
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https://crystal-lang.org/api/0.35.1/SystemError.html