Delegate, scope and associative array

[Edwin van Leeuwen via Digitalmars-d-learn]

On Tuesday, 3 June 2014 at 05:40:44 UTC, Edwin van Leeuwen wrote:
> On Monday, 2 June 2014 at 23:44:01 UTC, Rene Zwanenburg wrote:
>> On Monday, 2 June 2014 at 20:09:12 UTC, Edwin van Leeuwen 
>> wrote:
>> As you may have guessed, a workaround is to copy the iteration 
>> variable yourself:
>>
>> unittest {
>>    size_t delegate()[size_t] events;
>>    foreach(_i; 1..4 ) {
>>        auto i = _i;
>>        events[i] = { return i; };
>>    }
>>    assert( events[1]() == 1 );
>> }
>>
>> This should work though it's less than ideal. There is an open 
>> bug report:
>> https://issues.dlang.org/show_bug.cgi?id=8621
>
> Thanks for the suggestion and I just tried it, but it does not
> work :(
>
> In the original code were I discovered this problem I generated
> the id with an outside function and that also didn't to work.

unittest {
     size_t delegate()[size_t] events;
     size_t i = 1;
     events[i] = { return i; };
     i = 2;
     events[i] = { return i; };
     i = 3;
     events[i] = { return i; };
     writeln( events[1]() );
     assert( events[1]() == 1 );
}

Explicitly removing the loop still causes the same issue. In that 
case I find it easier to understand, since it might be using the 
value of i at the end of the scope. In the foreach case (and 
especially when copying to a local variable) it is more puzzling 
to me.