syntax_data: {"ast_node_type":"other","tokens":[{"end":45,"kind":"keyword","start":0,"text":"assert_eq!(input.len(),"}]}
source_snippet:     assert_eq!(input.len(), selection.len());
context_before: fn span_from_selection(input: &str, selection: &str) -> Span {
context_after:     let left_index = selection.find('~').unwrap() as u32;