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/usr/share/go-1.8/test/fixedbugs/issue16306.go is in golang-1.8-src 1.8.3-2ubuntu1.

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// compile

// 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 main

import "unsafe"

var x = unsafe.Pointer(uintptr(0))

func main() {
	_ = map[unsafe.Pointer]int{unsafe.Pointer(uintptr(0)): 0}
}