package main
import "fmt"
import "unsafe"
import "runtime"
func f() **int {
for false{} // avoid f being inlined.
s := make([]byte, unsafe.Sizeof((*int)(nil))) // enough memory to hold
a pointer
pp := (**int)(unsafe.Pointer(&s[0]))
x := 123
*pp = &x
return pp
}
var a []int
func main() {
p := f()
runtime.GC()
// Is the memory allocated for x in f
// guaranteed to be reachable at this moment?
a = make([]int, 10)
fmt.Println(**p, a)
}
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