lockRankTrace:           "trace",
	lockRankTraceStackTab:   "traceStackTab",
	lockRankPanic:           "panic",
	lockRankDeadlock:        "deadlock",
	lockRankRaceFini:        "raceFini",
	lockRankAllocmRInternal: "allocmRInternal",
	lockRankExecRInternal:   "execRInternal",
	lockRankTestRInternal:   "testRInternal",
}

func (rank lockRank) String() string {
	if rank == 0 {
		return "UNKNOWN"
	}

# below all other locks.
panic < deadlock;
# raceFini is only held while exiting.
panic < raceFini;

# RWMutex internal read lock

allocmR,
  allocmW
< allocmRInternal;

execR,
  execW
< execRInternal;

testR,
  testW
< testRInternal;
`

// cyclicRanks lists lock ranks that allow multiple locks of the same