syntax_data: {"ast_node_type":"other","tokens":[{"end":68,"kind":"keyword","start":0,"text":"assert_eq!(edit_distance_with_substrings(\"a\","}]}
source_snippet:     assert_eq!(edit_distance_with_substrings("a", "abcd", 1), None);
context_before:     assert_eq!(edit_distance_with_substrings("abc", "abcd", 1), Some(1));
context_after:     assert_eq!(edit_distance_with_substrings("edf", "eq", 1), None);