[Issue 12702] [FixIncluded] std.container.RedBlackTree's in operator is not const

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=12702

--- Comment #3 from Mark Isaacson <markisaa at umich.edu> ---
(In reply to Andrej Mitrovic from comment #2)
> Could you create a pull request for these? It would be welcome!

Cool. When I saw that just about everything else in that module was not
const-correct I thought it may have been an intentional decision. I will
probably work on this later in the week and try and provide a more
complete/better styled pull request then.

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