cet-is » art

My collaborator witnessed the following exception message:

%MSG-s ArtException:  PostEndJob 26-Aug-2019 14:10:01 CDT ModuleEndJob
cet::exception caught in art
---- OtherArt BEGIN
 ---- EventProcessorFailure BEGIN
   EventProcessor: an exception occurred during current event processing
   ---- EventProcessorFailure BEGIN
     EndPathExecutor: an exception occurred during current event processing
     ---- ScheduleExecutionFailure BEGIN
       Path: ProcessingStopped.
       ---- StdException BEGIN
         A exception occurred during a call to the module
       ---- StdException END
       Exception going through path end_path
     ---- ScheduleExecutionFailure END
   ---- EventProcessorFailure END
 ---- EventProcessorFailure END
---- OtherArt END
%MSG

with the precious information that A exception occurred during a call to the module.
It turns out that was a std::length_error exception.
It would help if the message had specified what() the exception was (after all, it's derived from std::exception, so it should be able to tell), and maybe the actual type of the exception (std::length_error).
I don't exclude that the output was printed somewhere else in the log, but even if so, it was surely not as prominent as in this 5-level-indented message.