Remove out-of-date explanation in doc strings,
as reported by Eric C. Newton.
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@ -26,9 +26,7 @@ class ASTVisitor:
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the order during a postorder walk, because it is called _after_
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the walk has occurred.) The ASTVisitor modifies the visitor
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argument by adding a visit method to the visitor; this method can
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be used to visit a particular child node. If the visitor method
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returns a true value, the ASTVisitor will not traverse the child
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nodes.
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be used to visit a particular child node.
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XXX The interface for controlling the preorder walk needs to be
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re-considered. The current interface is convenient for visitors
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