[tor-bugs] #25628 [Core Tor/Tor]: Document our Rust coding standards for error/failure types

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#25628: Document our Rust coding standards for error/failure types
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 Reporter:  isis                                 |          Owner:  (none)
     Type:  enhancement                          |         Status:  new
 Priority:  Medium                               |      Milestone:  Tor:
                                                 |  unspecified
Component:  Core Tor/Tor                         |        Version:
 Severity:  Normal                               |     Resolution:
 Keywords:  rust, tor-doc, 034-triage-20180328,  |  Actual Points:
  034-removed-20180328                           |
Parent ID:                                       |         Points:
 Reviewer:                                       |        Sponsor:
                                                 |  Sponsor8-can
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Comment (by cypherpunks3):

 Replying to [ticket:25628 isis]:
 > (doesn't have the `::failure::Fail` impl yet, because the failure crate
 is about to become 1.0.0 any day now).

 [https://github.com/rust-lang-
 nursery/failure/commit/cad26ae30f8fb0ab3c119bc8589dd0bfc1029633 Not
 anymore it's not.] See also #26337.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/25628#comment:4>
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