[issue4347] Circular dependency causes SystemError when adding new syntax

[Thomas Lee]

Thomas Lee <tom at vector-seven.com> added the comment:

This would appear to be another build quirk: Lib/symbol.py needs to be
regenerated if Grammar/Grammar changes.

Brett, do you think it would be okay for this file to be generated
automatically as part of the build process? I can't think of any good
reason why this should continue to be a manual task.

Lib/token.py is in a similar boat, except its dependency is on
Include/token.h

Whatever the decision, I'll provide another review/functional patch pair.

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