(If so, it sounds like syntax parameters may be the solution. But at this point I'm just trying to make sure I understand the problem.)Yes, I believe syntax-parameters could be used. It would be clumsy, since themacros involved would have to syntax-parameterize the entire SRE language oneach expansion. But if we're entertaining non-standard extensions then it's muchsimpler, easier to port and more robust to just use an ER macro with unhygienicmatching.
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