var crypto/x509/pkix.oidPostalCode

2 uses

	crypto/x509/pkix (current package)
		pkix.go#L193: 	oidPostalCode         = []int{2, 5, 4, 17}
		pkix.go#L231: 	ret = n.appendRDNs(ret, n.PostalCode, oidPostalCode)