I assume this is a x-platform failure. Don't have time to look into it myself right now. C:\Code\python\dist\src\PCbuild>python -O ../lib/test/test_inspect.py Traceback (most recent call last): File "../lib/test/test_inspect.py", line 172, in ? 'trace() row 1') File "../lib/test/test_inspect.py", line 70, in test raise TestFailed, message % args test_support.TestFailed: trace() row 1 C:\Code\python\dist\src\PCbuild>