Auto merge of #30654 - nrc:panictry, r=brson

The motivation (other than removing boilerplate) is that this is a baby step towards a parser with error recovery.

[breaking-change] if you use any of the changed functions, you'll need to remove a try! or panictry!
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bors
2016-01-06 20:30:55 +00:00
12 changed files with 318 additions and 313 deletions

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