/usr/share/go-1.8/test/fixedbugs/issue13485.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 2010 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 (
	_ [10]int
	_ [10.0]int
	_ [float64(10)]int                // ERROR "invalid array bound"
	_ [10 + 0i]int
	_ [complex(10, 0)]int
	_ [complex128(complex(10, 0))]int // ERROR "invalid array bound"
	_ ['a']int
	_ [rune(65)]int
)
 |