void fn((String, String) record) { final first = record.$1; final second = record.$2;}
Good
void fn(({String first, String second}) record) { final first = record.first; final second = record.second;}
Usage
To enable the avoid_positional_fields_in_records rule, add avoid_positional_fields_in_records under custom_lint > rules in your analysis_options.yaml file:
