/usr/share/go-1.8/test/fixedbugs/issue16439.go is in golang-1.8-src 1.8.3-2ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 | // errorcheck
// Copyright 2016 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
var a []int = []int{1: 1}
var b []int = []int{-1: 1} // ERROR "must be non-negative integer constant"
var c []int = []int{2.0: 2}
var d []int = []int{-2.0: 2} // ERROR "must be non-negative integer constant"
var e []int = []int{3 + 0i: 3}
var f []int = []int{3i: 3} // ERROR "truncated to real"
var g []int = []int{"a": 4} // ERROR "must be non-negative integer constant"
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