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The existing function, IsOneOf, is hard to use. Since the slice comes before the rune, in parallelism with the other Is functions, the slice is clumsy to build. This CL adds a nicer-signatured In function of equivalent functionality (its implementation is identical) that's much easier to use. Compare: unicode.IsOneOf([]*unicode.RangeTable{unicode.Letter, unicode.Number}, r) unicode.In(r, unicode.Letter, unicode.Number) R=golang-dev, adg CC=golang-dev https://golang.org/cl/11672044