dip25 implementation

[Xiaoxi via Digitalmars-d]

On Thursday, 6 August 2015 at 19:55:20 UTC, Steven Schveighoffer 
wrote:
> On 8/4/15 4:54 PM, Steven Schveighoffer wrote:
>> How complete is the dip25 implementation?
>>
>> For example, should this be expected to be an error?
>>
>> struct S
>> {
>>    int[5] x;
>>    auto foo() { return x[];}
>> }
>>
>> I'll note, that dmd 2.067.0 with -dip25 considered this an 
>> error, head
>> does not. Adding a 'return' to the foo attributes fixes it in 
>> 2.067, but...
>>
>> auto getS()
>> {
>>     S s;
>>     return s.foo();
>> }
>>
>> does not error in either version, even with the return 
>> attribute.
>
> Anyone? Is this a bug or not?
>
> -Steve

why is it related to dip25? slices uses pointers not ref?