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0.13.2
Subclasses of TreeNode already do `visit(visitor) => visitor.visitSomething(this)`, this just exposes it at the root of the tree hierarchy. This is needed for package:html, where we have code that would do the equivalent of `x = node.visit(myVisitor)`. R=rnystrom@google.com Review URL: https://codereview.chromium.org//1969953002 .