var net/textproto.commonHeader

4 uses

	net/textproto (current package)
		reader.go#L652: 	if v := commonHeader[string(a)]; v != "" {
		reader.go#L659: var commonHeader map[string]string
		reader.go#L664: 	commonHeader = make(map[string]string)
		reader.go#L706: 		commonHeader[v] = v