The 126.96.36.199 version of Command Line Parser Library introduces a new subsystem for reporting parsing errors. I suggest you not to tie the code to this feature because it's at embryonic stage and hence it's subject to change.
The feature is modeled around the actual logic of the parser, that stops itself at the first parsing error, so you'll get just the first error that the parser detects.
Please be patient and wait the upcoming release (maybe 188.8.131.52) in which this subsystem will be completely redesigned.
Thank you for following this project!