syntax_data: {"ast_node_type":"other","tokens":[{"end":69,"kind":"keyword","start":0,"text":".map(|(n,"}]}
source_snippet:                             .map(|(n, ty)| match fields_map.get(&n) {
context_before:                         itertools::zip_eq(field_names, &**field_types)
context_after:                                 Some(v) => v.clone(),