Shared keyword and the GC?

[renoX]

Hello,
in the discussions thread in the recent blog post which 
summarized how GC works(*), the topic of thread-local GC was 
further discussed and I pointed out that by default global 
variables in D are thread local but I was answered that the types 
doesn't tell which global variable are thread local and which are 
shared so the GC cannot use this information, is-it true?
It seems like a wasted opportunity..

BR,
renoX


*:
http://xtzgzorex.wordpress.com/2012/10/11/demystifying-garbage-collectors/