[issue4991] os.fdopen doesn't raise on invalid file descriptors

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

I'm not sure Windows has a valid fstat btw, I'll guess we'll see on the
Windows buildbots (in that case, some code can be taken from
posixmodule.c to emulate fstat behaviour...). Other than that, the patch
looks fine to me.

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