[RFC] parallel/tree.h?

[Benjamin Kosnik]

> earlier today was noticing something very strange in
> include/parallel/tree.h: apparently there are some const qualified
> non-member functions and no errors are triggered during testing...

Don't really see any of these...

> Turns out that header is not included anywhere, it contains some
> undocumented facilities and support code, but doesn't seem to play
> any any role in the implementation of the documented facilities...
> So, what are we going to do with it? (sorry if I'm just badly
> mistaken... it's late here...)

I'm not quite sure what is going on with this either. I believe that
Johannes and others may be working on using this file for parallel
versions of some data structures. Maybe he could clarify his intentions
here?

-benjamin