--- Comment #4 from Paul Eggert <eggert at gnu dot org> ---
This bug causes GNU coreutils Bug#22793 "grep -E assertion failure with back
references"; see <https://bugs.gnu.org/22793>. I'm adding comments to both bug
reports so that the connection between the two bugs is clearer.
Although this bug's current assignee is Paolo Bonzini (the original reporter),
I think Paolo is pretty busy doing other stuff. Is someone else available to
work on regex bugs? I suspect the fix for this bug will not be trivial.
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