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On Friday, May 06, 2016 at 12:46PM, Roberto Ierusalimschy wrote:
> - new semantics for empty matches ("Python rule")

I'm just catching up on the list, and I'm not familiar with previous
discussion about this. I'm also not familiar with Python or its semantics
for empty matches.

If anyone could point me to previous discussion or explain this change
a bit more fully, I'd appreciate it.

Thanks, P
We have not been faced with the need to satisfy someone else's
requirements, and for this freedom we are grateful.
    Dennis Ritchie and Ken Thompson, The UNIX Time-Sharing System