[tor-bugs] #28246 [Core Tor/Tor]: Use rust stable in Travis

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#28246: Use rust stable in Travis
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     Reporter:  nickm         |      Owner:  (none)
         Type:  defect        |     Status:  new
     Priority:  Medium        |  Milestone:  Tor: 0.3.5.x-final
    Component:  Core Tor/Tor  |    Version:
     Severity:  Normal        |   Keywords:
Actual Points:                |  Parent ID:  #28244
       Points:                |   Reviewer:
      Sponsor:                |
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 Currently we require rust 1.31 (beta?) for use with asan, because of the
 fixes in #27273.

 1. On Travis, we should add a test that uses rust stable without
 sanitizers.

 2. Once Rust 1.31 is stable (December?) we should enable sanitizers with
 rust stable.

 See Teor's
 https://trac.torproject.org/projects/tor/ticket/27273#comment:14 for a
 much more comprehensive version of the matrix.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/28246>
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