const unicode/utf8.mask4

3 uses

	unicode/utf8 (current package)
		utf8.go#L39: 	mask4 = 0b00000111
		utf8.go#L188: 	return rune(p0&mask4)<<18 | rune(b1&maskx)<<12 | rune(b2&maskx)<<6 | rune(b3&maskx), 4
		utf8.go#L236: 	return rune(s0&mask4)<<18 | rune(s1&maskx)<<12 | rune(s2&maskx)<<6 | rune(s3&maskx), 4

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