The following errors are reported:
Examples:
DateTimeFormatter.ofPattern("[][]]"); // Closing ']' without previous opening '['
DateTimeFormatter.ofPattern("TT"); // Illegal pattern letter 'T'
DateTimeFormatter.ofPattern("{"); // Use of reserved character '{'
DateTimeFormatter.ofPattern("MMMMMM"); // Too many consecutive pattern letters 'M'
New in 2022.3