syntax_data: {"ast_node_type":"variable","tokens":[{"end":97,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:         let actual_positions: Vec<_> = actual_positions.into_iter().map(|nc| nc.pos.0).collect();
context_before:         normalize_newlines(&mut actual, &mut actual_positions);
context_after:         assert_eq!(actual.as_str(), after);