[issue1518] Fast globals/builtins access (patch)

[Christian Heimes]

Christian Heimes added the comment:

When I run the code of test_gc.py test_function() in a shell I'm getting
the expected result of 2 collected items:

gc: collectable <dict 0xb78aa13c>
gc: collectable <function 0xb78a9374>

However the same code embedded in the test suite collects two additional
objects:

gc: collectable <dict 0x830061c>
gc: collectable <function 0x82a3d54>
gc: collectable <fastglobals 0x82a4244>
gc: collectable <tuple 0x82a168c>

I've used gc.set_debug(gc.DEBUG_LEAK) to get the information

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nosy: +tiran

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