code: @Override
      public void trace( F0<Throwable> exception )
      {
          if ( compilerLogger.isDebugEnabled() )
          {
              compilerLogger.debug( exception.apply() );
          }
      }
docs: Send a message to the user in the <b>trace</b> error level
  if the <b>trace</b> error level is enabled.
  
  @param exception exception thrown