Source span of an error, in UTF-16 code units into the original notation. start is inclusive; end is exclusive and present only when the error carries a full span (evaluator errors) rather than a single offset.
start
end
Optional
Source span of an error, in UTF-16 code units into the original notation.
startis inclusive;endis exclusive and present only when the error carries a full span (evaluator errors) rather than a single offset.