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* lib/regex_internal.c (re_node_set_insert): Remove the DEBUG_ASSERT and instead return early for an attempt to insert an ELEM that is already present in the set. Relax the function's comment that says there should be no duplicate. This function is called from many places and has been working fine. With its nontrivial backrefs, the sample regexp apparently elicits enough backtracking retries and state-set merges to trigger this duplicate insertion attempt. Reported by Bruno Haible in https://lists.gnu.org/r/bug-gnulib/2026-04/msg00138.html
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