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The following syntactic bindings are exported by the library
(vicare containers binary-search-trees).
Record type representing a node in a binary tree. The
<unbalanced-binary-node> type is non–generative and available
for subtyping. It is derived from <binary-node>. In this
documentation <unbalanced-binary-node> object arguments to
functions are indicated as unode.
Build and return a new instance of <unbalanced-binary-node>.
The optional arguments left and right must be #f or
instances of <unbalanced-binary-node> representing the left
and right subtrees. The parent field of the new instance is set
to #f.
Return #t if obj is an instance of
<unbalanced-binary-node>; otherwise return #f.