First-class error handling with `?` and `catch`#243

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nikomatsakis merged 10 commits intorust-lang:masterfrom

glaebhoerl:trait-based-exception-handling

Feb 5, 2016

Commits on Sep 16, 2014

Trait-based exception handling
glaebhoerl
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I was going to mention "just do it with a macro" in the Alternatives, but it somehow got lost in the shuffle
glaebhoerl
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Commits on Dec 29, 2015

RFC update, first pass:
glaebhoerl
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make clearer that early-exit-from-any-block is not proposed, mention it in "Future possibilities"
glaebhoerl
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Commits on Jan 22, 2016

Add specifics around feature gates
aturon
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Commits on Jan 25, 2016

Merge pull request #1 from aturon/explicate-gates
glaebhoerl
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