Renji <asore...@gmail.com> added the comment:

I through "forward reference" is "\1 (abcd)". Not "some sort of reference in 
second repetition to data from first repetition".

Ok. In other words refers from on repetition to other supported, but with 
purely formal restrictions. And remove this restrictions don't planned. Than 
this issue may be closed.

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue42871>
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