code: @Override
      public void warn( F0<String> msg )
      {
          if ( compilerLogger.isWarnEnabled() )
          {
              String msgString = msg.apply();
              if ( !MISLEADING_WARNING_MESSAGE.equals( msgString ) )
              {
                  compilerLogger.warn( msgString );
              }
          }
      }
docs: Send a message to the user in the <b>warn</b> error level
  if the <b>warn</b> error level is enabled.
  
  @param msg message