var net/textproto.commonHeader

4 uses

	net/textproto (current package)
		reader.go#L790: 	if v := commonHeader[string(a)]; v != "" {
		reader.go#L797: var commonHeader map[string]string
		reader.go#L802: 	commonHeader = make(map[string]string)
		reader.go#L844: 		commonHeader[v] = v

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