Does D have "structural sharing" of immutable collections?

[Roman D. Boiko]

On Wednesday, 23 May 2012 at 18:24:28 UTC, simendsjo wrote:
> On Wed, 23 May 2012 20:18:54 +0200, simendsjo 
> <simendsjo at gmail.com> 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
>
> And http://dsource.org/projects/dcollections

Those aren't immutable either :(