feat: prove that regular languages are closed under Kleene star #241
+514
−26
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This patch proves that regular languages are closed under Kleene star. The proof technique is similar to the one used in PR #239 and re-uses much of the infrastructure introduce in that PR.
This PR depends on both #236 and #239. To review it, please look at only the changes made by f1fa2a5 and later commits.