syntax_data: {"ast_node_type":"variable","tokens":[{"end":58,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:     let c = "Mary häd ä little lämb\n\nLittle lämb\n";
context_before:     let b = "\nMary häd ä little lämb\n\nLittle lämb\n";
context_after:     assert_eq!(edit_distance(a, b, usize::MAX), Some(1));