visitor trait rewrite step 4 (of 5). #8623
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This was referenced Aug 20, 2013
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…r=huonw "non-mechanical" : there was lots more hacking than the other more-mechanical ports Felix did. r? @huonw. (Or @nikomatsakis ; I just want someone to sanity-check this. Its not a thing of beauty.) Followup to #8623. (See #8527, which was step 1 of 5, for the full outline. Part of #7081.) Notes on the change follow. There's also a strange pattern that I hacked in to accommodate the Outer/Inner traversal structure of the existing code (which was previously encoding this by untying the Y-combinator style knot of the vtable, and then retying it but superimposing new methods that "stop at items"). I hope either I or someone else can come back in the future and replace this ugliness with something more natural. Added boilerplate macro; all the OuterLint definitions are the same (but must be abstracted over implementing struct, thus the macro). Revised lint.rs use declarations to make ast references explicit. Also removed unused imports.
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Follow up to #8619 (step 3 of 5).
(See #8527, which was step 1 of 5, for the full outline.)
Part of #7081.