Leave apply available in the generic traverser to do something else.
Performs a traversal with a given owner symbol.
Traverses a single tree.
Traverse something which Trees contain, but which isn't a Tree itself.
Traverses a list of trees with a given owner symbol.
Traverses a list of trees.
Traverses a list of lists of trees.
A class that implement a default tree traversal strategy: breadth-first component-wise.