Load in the attached date_time_symbols file. It contains an error, on line 2858, with a doubled colon. However, if I load it into the editor, it highlights the error as being at line 3159, which is fine. My guess would be that something is counting bytes where it ought to be counting characters, or vice versa.
Attachments:
date_time_symbols.dart (187.32 KB)
date_format_for_locale.dart (2.05 KB)