syntax_data: {"ast_node_type":"other","tokens":[{"end":70,"kind":"keyword","start":0,"text":"itertools::zip_eq(field_names,"}]}
source_snippet:                         itertools::zip_eq(field_names, &**field_types)
context_before:                         // reads it from the base.
context_after:                             .map(|(n, ty)| match fields_map.get(&n) {