// errorcheck
// Copyright 2011 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.
// Issue 1722.
// Check that the error messages says
// bug337.go:16: len("foo") not used
// and not
// bug337.go:16: 3 not used
package main
func main() {
len("foo") // ERROR "len|value computed is not used"
}