[Issue 21929] delegates capture do not respect scoping

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=21929

--- Comment #6 from deadalnix <deadalnix at gmail.com> ---
(In reply to Walter Bright from comment #4)
> Let's rewrite it to something that does not use closures:
> 
>  int test() @safe {
>     int j;
>     int*[20] ps;
> 
>     for (int i = 0; i < 10; i++) {
>         ps[j++] = &i;
>     }
> 
>     for (int i = 0; i < 10; i++) {
>         int index = i;
>         ps[j++] = &index;
>     }
> 
>     int x;
>     foreach (p; ps)  {
>         x += *p;
>     }
> 
>     return x;
>  }
> 
> This code is equivalent in terms of what is happening with references and
> scopes.
> 
> Compiling it with -dip1000 yields:
> 
>   Error: address of variable i assigned to ps with longer lifetime
>   Error: address of variable index assigned to ps with longer lifetime
> 
> Which is pragmatically what the behavior of the delegate example would be,
> because the delegate is also storing a pointer to the variable.

Except it is not. In D, closures do allocate on heap.

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