[Issue 9651] Returning a newly-created slice by reference

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=9651


Ivan Kazmenko <gassa at mail.ru> changed:

           What    |Removed                     |Added
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           See Also|                            |http://d.puremagic.com/issu
                   |                            |es/show_bug.cgi?id=4451


--- Comment #1 from Ivan Kazmenko <gassa at mail.ru> 2013-03-05 12:05:11 PST ---
Interestingly, a local array and a delegate do generate a warning.  However,
the warning says "escaping reference to local variable a" which is not true:
the problem lies in escaping reference to a local unnamed slice, not variable
"a" which is legally visible to the caller.  The non-ref versions compile and
run without problems.

Example 3 (local fixed length array):
-----
import std.stdio;

void main ()
{
    int [1] a;

    ref int [] f ()
    {
        return a [0..1];
    }

    auto s = f ();
    writeln (s);
}
-----

Example 4 (local variable length array):
-----
import std.stdio;

void main ()
{
    int [] a;

    ref int [] f ()
    {
        return a [0..1];
    }

    a = new int [1];
    auto s = f ();
    writeln (s);
    auto t = f ();
    writeln (t);
}
-----

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