gh-118761: Fix star-import of ast

[AA-Turner]

cc @danielhollas

I agree that removing 'sys' in __dir__ is fragile, but we can now move the import to the main() function, which I missed initially.

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• Issue: Improve import time of various stdlib modules #118761

[danielhollas]

I agree that removing 'sys' in dir is fragile, but we can now move the import to the main() function, which I missed initially.

Thanks, but my original objection still stands: If somebody introduces a new import at the top of the file and "forgets" to modify __dir__ we have a problem. And that problem would be worse in this PR which explicitly couples __dir__ to star imports.

[AA-Turner]

Closing in favour of #132025.

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