d0d05075ed
The general theme of this is to make parser a better independent library. The specific thing we do here is replacing callback based TreeSink with a data structure. That is, rather than calling user-provided tree construction methods, the parser now spits out a very bare-bones tree, effectively a log of a DFS traversal. This makes the parser usable without any *specifc* tree sink, and allows us to, eg, move tests into this crate. Now, it's also true that this is a distinction without a difference, as the old and the new interface are equivalent in expressiveness. Still, this new thing seems somewhat simpler. But yeah, I admit I don't have a suuper strong motivation here, just a hunch that this is better.
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