net/http.persistConn.writeLoopDone (field)

4 uses

	net/http (current package)
		transport.go#L1564: 		writeLoopDone: make(chan struct{}),
		transport.go#L1890: 	writeLoopDone chan struct{} // closed when write loop ends
		transport.go#L2008: 	<-pc.writeLoopDone
		transport.go#L2380: 	defer close(pc.writeLoopDone)