// compile

// Copyright 2019 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package p

func f() {
	var i int
	var b *bool
	var s0, s1, s2 string

	if *b {
		s2 = s2[:1]
		i = 1
	}
	s1 = s1[i:-i+i] + s1[-i+i:i+2]
	s1 = s0[i:-i]
}