const runtime.traceEvUserRegion

2 uses

	runtime (current package)
		trace.go#L73: 	traceEvUserRegion        = 47 // trace.WithRegion [timestamp, internal task id, mode(0:start, 1:end), name string, stack]
		trace.go#L1741: 	traceEventLocked(0, mp, pid, bufp, traceEvUserRegion, 0, 3, id, mode, nameStringID)