// Copyright 2020 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 undeclared

func x() int {
	var z int
	y := 
	z = y // want "undeclared name: y"

	m := 
	if z == m { // want "undeclared name: m"
		z = 1
	}

	n := 
	if z == 1 {
		z = 1
	} else if z == n+1 { // want "undeclared name: n"
		z = 1
	}

	a := 
	switch z {
	case 10:
		z = 1
	case a: // want "undeclared name: a"
		z = 1
	}
	return z
}