NOTE: the latest version is 7.0.0
Functions for transforming a tree or a forest to a string.
The first argument is the quantum of indentation. The second is a function for transforming a node of a tree to a string.
The first argument is the quantum of indentation. The second is a function for transforming a node of a forest to a string.
The first argument is the quantum of indentation. The second is a function for transforming a node of a tree to a string.