magically a static member on init?

[Martin via Digitalmars-d-learn]

Hi, i do no know if this is intended - but imo this is weird:
https://run.dlang.io/is/eBje3A
I expected that `c.a.str == ""` (just like `c.str` is). But 
instead `c.a.str` keeps the value of `b.a.str`.

Is this intentional? IMO this feels not consistent and its weird 
when a reference leaks into another instance without having 
declared it static member.

Greetigs