const unicode/utf8.t2

3 uses

	unicode/utf8 (current package)
		utf8.go#L31: 	t2 = 0b11000000
		utf8.go#L350: 		p[0] = t2 | byte(r>>6)
		utf8.go#L387: 		return append(p, t2|byte(r>>6), tx|byte(r)&maskx)