std.container.rbtree has no search method?! e.g. `contains`, `canFind`

[mw via Digitalmars-d-learn]

Hi,

on doc:

https://dlang.org/phobos/std_container_rbtree.html#.RedBlackTree

I cannot find any search method?! e.g. `contains`, `canFind`.

Is this a over look? Or there are such functions else where?