bors 6153aae809 auto merge of #5559 : jbclements/rust/change-to-tt-based-parsing, r=jbclements
Changes the parser to parse all streams into token-trees before hitting the parser proper, in preparation for hygiene.  As an added bonus, it appears to speed up the parser (albeit by a totally imperceptible 1%).

Also, many comments in the parser.
Also, field renaming in token-trees (readme->forest, cur->stack).
2013-04-03 11:31:03 -07:00
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