Two minor fixes in parser.rs#14136

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paulstansifer wants to merge 2 commits intorust-lang:masterfrom

paulstansifer:macro_parsing

Commits on May 11, 2014

Add some long-overdue documentation on the INTERPOLATED helper macros.
paulstansifer
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Cleanup some ugly variable names, now that we have `let`-hygiene.
paulstansifer
committed