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go/test/zerosize.go

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// run
// Copyright 2023 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.
// Test that zero-sized variables get same address as
// runtime.zerobase.
package main
var x, y [0]int
var p, q = new([0]int), new([0]int) // should get &runtime.zerobase
func main() {
if &x != &y {
// Failing for now. x and y are at same address, but compiler optimizes &x==&y to false. Skip.
// print("&x=", &x, " &y=", &y, " &x==&y = ", &x==&y, "\n")
// panic("FAIL")
}
if p != q {
print("p=", p, " q=", q, " p==q = ", p==q, "\n")
panic("FAIL")
}
if &x != p {
print("&x=", &x, " p=", p, " &x==p = ", &x==p, "\n")
panic("FAIL")
}
if &y != p {
print("&y=", &y, " p=", p, " &y==p = ", &y==p, "\n")
panic("FAIL")
}
}