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          The logger parameter allows to fully specify (log
          format, level and sink) one or several loggers in one command. If this
          parameter is specified, it has precedence over log_format, log_level and log_sink.
        
The parameter is repeatable: it may appear several times on the command line. It is possible to indicate a set of loggers using the separator ':', which is the only way for repeating a logger description through the environment variable.
          The parameter is composed of three fields separated by a coma ',' and indicating
          respectively the log format, level and sink. The log format is mandatory.
          The log level and sink are both optional: if omitted, the default for the
          specified format will be used. The log level and sink accept the same value
          as their respective command line switch (see log_level and log_sink for more information).
        
Case sensitive string:
logger_set ::= (logger ':')* logger logger ::= logger_format (',' log_level? (',' log_sink? )? )? logger_format ::= 'HRF' | 'XML' | 'JUNIT' log_level ::= 'all' | 'success' | 'test_suite' | 'message' | 'warning' | 'error' | 'cpp_exception' | 'system_error' | 'fatal_error' | 'nothing' log_sink ::= 'stdout' | 'stderr' | filename
Examples:
--logger=HRF,all
              will set the all log
              level for the HRF log
              format, and will use the default sink associated to HRF
              (stdout)
            --logger=JUNIT,,somefile.xml:HRF,warning
              will use the default log level associated to the JUNIT
              log format, and will use the file somefile.xml
              as the log sink. It will also enable the HRF
              format with log level warning.
              The corresponding sink will be set to the HRF
              default (stdout).
            --logger=<logger_set>
            BOOST_TEST_LOGGER