delete(it.tasks, TaskID(ev.Args[0]))
			mappedArgs = timedEventArgs{
				ev.Args[0],
				ev.Args[1],
				uint64(ts.parentID),
				uint64(it.evt.addExtraString(ts.name)),
			}
		} else {
			mappedArgs = timedEventArgs{ev.Args[0], ev.Args[1], uint64(NoTask), uint64(it.evt.addExtraString(""))}
		}
	case oldtrace.EvUserRegion:
		switch ev.Args[1] {
		case 0: // start
			mappedType = go122.EvUserRegionBegin
		case 1: // end