const fmt.hexadecimalDigits

4 uses

	fmt (current package)
		scan.go#L562: 	hexadecimalDigits = "0123456789aAbBcCdDeEfF"
		scan.go#L582: 		digits = hexadecimalDigits
		scan.go#L630: 		return 0, hexadecimalDigits + "_", true
		scan.go#L717: 		digits = hexadecimalDigits + "_"