RFC: `throw` expressions#2426

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Centril wants to merge 9 commits intorust-lang:masterfrom

Centril:rfc/throw-expr

Commits on May 1, 2018

rfc, throw-expr: better breakage analysis and some initial discussion of throw vs. fail.
Centril
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rfc, throw-expr: drawback: no early-return Ok-wrapping.
Centril
committed

Commits on May 2, 2018

rfc, throw-expr: add unresolved question: `throw 'label expr`
Centril
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Commits on May 4, 2018

rfc, throw-expr: also reserve `fail` and leave the choice of keyword unresolved.
Centril
committed