Function rustc_span::lev_distance::find_best_match_for_name

pub fn find_best_match_for_name(
    candidates: &[Symbol],
    lookup: Symbol,
    dist: Option<usize>
) -> Option<Symbol>

Finds the best match for a given word in the given iterator.

As a loose rule to avoid the obviously incorrect suggestions, it takes an optional limit for the maximum allowable edit distance, which defaults to one-third of the given word.

Besides Levenshtein, we use case insensitive comparison to improve accuracy on an edge case with a lower(upper)case letters mismatch.