func ContainsRune(b []byte, r rune) bool {
	return IndexRune(b, r) >= 0
}

// ContainsFunc reports whether any of the UTF-8-encoded code points r within b satisfy f(r).
// It stops as soon as a call to f returns true.
func ContainsFunc(b []byte, f func(rune) bool) bool {
	return IndexFunc(b, f) >= 0
}

				ct.b, ct.r, !ct.expected, ct.expected)
		}
	}
}

func TestContainsFunc(t *testing.T) {
	for _, ct := range ContainsRuneTests {
		if ContainsFunc(ct.b, func(r rune) bool {
			return ct.r == r
		}) != ct.expected {
			t.Errorf("ContainsFunc(%q, func(%q)) = %v, want %v",
				ct.b, ct.r, !ct.expected, ct.expected)
		}
	}
}

var makeFieldsInput = func() []byte {