syntax_data: {"ast_node_type":"other","tokens":[{"end":55,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:             // NB: This can match a string without `=`.
context_before:         .flat_map(|(i, s)| {
context_after:             if let Some("debuginfo") = s.split('=').next() { Some(i) } else { None }