syntax_data: {"ast_node_type":"import","tokens":[{"end":74,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:     // also use `chars()` (and not `str::len()`) to calculate length here.
context_before:     // `fn edit_distance()` use `chars()` to calculate edit distance, so we must
context_after:     let lookup_len = lookup.chars().count();