Does D have "structural sharing" of immutable collections?

[Roman D. Boiko]

On Wednesday, 23 May 2012 at 18:18:55 UTC, simendsjo wrote:
> On Wed, 23 May 2012 17:05:21 +0200, Roman D. Boiko 
> <rb at d-coding.com> wrote:
>
>> I need some immutable collections for my D Compiler Tools 
>> project, namely linked list, red-black tree, and possibly some 
>> others.
>> So I'm going to create them for my use, and later generalize. 
>> I've created a project on GitHub, but didn't implement 
>> anything useful yet.
>
> http://dlang.org/phobos/std_container.html#SList
> http://dlang.org/phobos/std_container.html#RedBlackTree

Those are not immutable, unfortunately