[issue4347] Circular dependency causes SystemError when adding new syntax

[Brett Cannon]

Brett Cannon <brett at python.org> added the comment:

So I finally got around to reviewing the patch and while it looks fine,
I ended up with some failing tests: test_compiler test_quopri test_sys
test_transformer.

Do you know what is going on Thomas? This is after repeated make/make
clean calls and using your non-review patch with all of the
auto-generated changes included.

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