const runtime.traceBlockChanSend

3 uses

	runtime (current package)
		chan.go#L270: 	gopark(chanparkcommit, unsafe.Pointer(&c.lock), waitReasonChanSend, traceBlockChanSend, 2)
		traceruntime.go#L93: 	traceBlockChanSend
		traceruntime.go#L112: 	traceBlockChanSend:           "chan send",