syntax_data: {"ast_node_type":"function","tokens":[{"end":71,"kind":"keyword","start":0,"text":"pub"}]}
source_snippet: pub fn edit_distance(a: &str, b: &str, limit: usize) -> Option<usize> {
context_before: /// [edit distance]: https://en.wikipedia.org/wiki/Edit_distance
context_after:     let mut a = &a.chars().collect::<Vec<_>>()[..];