const runtime.traceBlockSynctest

4 uses

	runtime (current package)
		synctest.go#L191: 		gopark(synctestidle_c, nil, waitReasonSynctestRun, traceBlockSynctest, 0)
		synctest.go#L247: 	gopark(synctestwait_c, nil, waitReasonSynctestWait, traceBlockSynctest, 0)
		traceruntime.go#L105: 	traceBlockSynctest
		traceruntime.go#L125: 	traceBlockSynctest:           "synctest",