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The same `as` binding name appearing in multiple positions of a sequence (e.g., `(pat1 as x, ..., pat2 as x)`) produces incorrect DFA output — each binding gets independent tag cells, but the runtime has no way to resolve which one to report. Change `Ir.seq` to return `(t, string) result` and reject duplicate capture names across operands, matching the existing validation pattern used by `alt`, `capture`, `star`, `plus`, and `rep`. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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The same
asbinding name appearing in multiple positions of a sequence (e.g.,(pat1 as x, ..., pat2 as x)) produces incorrect DFA output — each binding gets independent tag cells, but the runtime has no way to resolve which one to report.Change
Ir.seqto return(t, string) resultand reject duplicate capture names across operands, matching the existing validation pattern used byalt,capture,star,plus, andrep.