[issue10786] unittest.TextTextRunner does not respect redirected stderr

[Michael Foord]

Michael Foord <michael at voidspace.org.uk> added the comment:

Actually I can't see a good reason why not to just lookup the *current* sys.stderr at instantiation time instead of binding at import time as is the current behaviour.

Patch with tests will make it more likely that this change goes in sooner rather than later.

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stage:  -> needs patch

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