overloaded-`box` and placement-`in`#809

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nikomatsakis merged 11 commits intorust-lang:masterfrom

pnkfelix:fsk-box-and-in-for-stdlib-rfc

Feb 11, 2015

Commits on Feb 4, 2015

initial draft
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Commits on Feb 5, 2015

Commits on Feb 9, 2015

switched placement-`in` syntax to `in PLACE { BLOCK }`.
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Extend Drawbacks section's discussion of type-inference and coercion
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Added more complete example of drawback, taken from gists on PR 22086.
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add transcript of compilation attempts, so the reader can see concretely
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Add one more note about acription and a place where it is particularly
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Add notes on using distinct feature-names for gating the two syntaxes separately.
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Note potential reason to keep `in (<place>) <expr>` over `in <place> { <block> }`
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Decided I care enough about the overloading+inference+coercion question
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