Garbage collection in D

[Robert Fraser]

What's the difference between:
>   D 1:  40.20 DMD
>   D 2:  21.83 DMD
>   D 2:  18.80 DMD, struct + scope

and:
>   D 1:   8.47 DMD
>   D 2:   7.41 DMD + scope

...?