syntax_data: {"ast_node_type":"variable","tokens":[{"end":31,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:         let mut search_idx = 0;
context_before:     fn find_crlf(src: &[u8]) -> Option<usize> {
context_after:         while let Some(idx) = find_cr(&src[search_idx..]) {