Code shared from run.dlang.io

main.d

int[] sneaky;
struct A
{
    private int[] innocent;
    ~this()
    {
        sneaky = innocent;
    }
}
void main()
{
    immutable a = A([1, 2, 3]);
    {
      auto b = a;
    }
    sneaky[1] = 42; // oops
    import std.stdio;
    writeln(a.innocent); // ooooops
}