syntax_data: {"ast_node_type":"variable","tokens":[{"end":33,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:     let len_diff = m.abs_diff(n);
context_before:     let big_len_diff = (n * 2) < m || (m * 2) < n;
context_after:     let distance = edit_distance(a, b, limit + len_diff)?;