Steve Dower <steve.do...@python.org> added the comment:

The tests mostly fail in the PGO run because they are highly sensitive to the 
source tree layout. We've never fixed them because they aren't that important 
to the PGO run - failure cases help with training - and the real tests pass 
fine under their more controlled conditions.

Don't rely on the PGO run for pass/fails. If you particularly want to fix them, 
I'd suggest coming up with a (provably) better set of training data, or 
focusing on running tests from alternate layouts (use the recent PC/layout 
script to generate sensible layouts in alternate locations).

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue35693>
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