syntax_data: {"ast_node_type":"other","tokens":[{"end":53,"kind":"keyword","start":0,"text":"Some(v)"}]}
source_snippet:                                 Some(v) => v.clone(),
context_before:                             .map(|(n, &ty)| match fields_map.get(&n) {
context_after:                                 None => match variant.fields[n].value {