[issue27066] SystemError if custom opener returns -1

[Barry A. Warsaw]

Barry A. Warsaw added the comment:

On May 20, 2016, at 12:12 AM, ppperry wrote:

>Also, `OSError [Errno 0] Error` isn't the most helpful error message.

No, definitely not. ;)

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<http://bugs.python.org/issue27066>
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