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

[Max Samukha]

On Friday, 7 February 2020 at 21:38:52 UTC, Steven Schveighoffer 
wrote:

>
> There are some cases in D which *could* be done with enough 
> analysis, but aren't because it would complicate the compiler 
> for little benefit (or make the language dependent on how 
> clever the compiler is).
>
> This is one of those cases. Just add static to the struct 
> declaration.
>
> -Steve

What analysis? Doesn't compiler already know the set of variables 
in the closure environment?