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Introduce a limit to Levenshtein distance computation Incorporate distance limit from `find_best_match_for_name` directly into Levenshtein distance computation. Use the string size difference as a lower bound on the distance and exit early when it exceeds the specified limit. After finding a candidate within a limit, lower the limit further to restrict the search space.
For high-level intro to how type checking works in rustc, see the type checking chapter of the rustc dev guide.