[tor-bugs] #25379 [Core Tor/Tor]: Determine the lowest rustc version we will compile with

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#25379: Determine the lowest rustc version we will compile with
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     Reporter:  isis          |      Owner:  (none)
         Type:  task          |     Status:  new
     Priority:  Low           |  Milestone:  Tor: 0.3.5.x-final
    Component:  Core Tor/Tor  |    Version:
     Severity:  Normal        |   Keywords:  rust, tor-build
Actual Points:                |  Parent ID:
       Points:  2             |   Reviewer:
      Sponsor:  SponsorM-can  |
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 In our docs, we say that we currently develop with nightly, and that we
 might stop doing that soon. In our Makefiles, we refuse to compile if
 rustc is <1.14. About a week ago, some of us were pretty excited that the
 current stable compiler (1.24) [https://blog.rust-
 lang.org/2018/02/15/Rust-1.24.html#other-good-stuff will now abort if a
 panic occurs at an FFI boundary]. Also, our Makefiles currently contain a
 linker workaround for OSX systems for rustc <1.24 (#25341).

 We should maaaaaybe narrow down which version(s) of Rust we're using?

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/25379>
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