{"ast_node_type":"other","tokens":[{"end":96,"kind":"keyword","start":0,"text":"build_field_mapping,"}]}
    build_field_mapping, is_doc_comment, report_error_if_not_applied_to_span, report_type_error,
    FieldInfo, FieldInnerTy, FieldMap, HasFieldMap, SetOnce, SpannedOption, SubdiagnosticKind,
    should_generate_arg, type_is_bool, type_is_unit, type_matches_path,