Member function increases size of a struct defined in a function - is this a bug?

[Max Samukha]

On Friday, 7 February 2020 at 18:58:54 UTC, H. S. Teoh wrote:
> On Fri, Feb 07, 2020 at 12:50:11PM +0000, Max Samukha via 
> Digitalmars-d wrote:
>> On Friday, 7 February 2020 at 12:36:23 UTC, Ferdinand Majerech 
>> wrote:
>> > 
>> > Is this the result of some D feature?
>> > I can imagine this could happen if InnerFun had a silently 
>> > added
>> > context pointer, but I don't know of such a feature in D.
>> > 
>> 
>> A pointer to the environment is a added to InnerFun for some 
>> reason
>> (probably, a bug).
>
> It's not a bug; the struct is declared inside function scope, 
> and so member functions can access function local variables. 
> Therefore a context pointer is necessary.
>

It is not necessary in this case, because the member function 
doesn't reference any variables in the outer function.

>
>> You can work around by marking InnerFun 'static':
> [...]
>
> Yes, this disables access to function local variables from 
> inside the struct, so it eliminates the context pointer.
>

Yes, but the compiler could infer that the context pointer is not 
necessary. Maybe it can't, who knows. The bug report has been 
open for 7 years without any response from language maintainers.

>
> T