var net/textproto.commonHeader

4 uses

	net/textproto (current package)
		reader.go#L791: 	if v := commonHeader[string(a)]; v != "" {
		reader.go#L798: var commonHeader map[string]string
		reader.go#L803: 	commonHeader = make(map[string]string)
		reader.go#L845: 		commonHeader[v] = v