[tor-bugs] #24795 [Core Tor/Tor]: test_rust fails on osx with "can't find crate for `libc`"

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#24795: test_rust fails on osx with "can't find crate for `libc`"
------------------------------+--------------------------------
     Reporter:  nickm         |      Owner:  (none)
         Type:  defect        |     Status:  new
     Priority:  Medium        |  Milestone:  Tor: 0.3.2.x-final
    Component:  Core Tor/Tor  |    Version:
     Severity:  Normal        |   Keywords:  rust osx tests
Actual Points:                |  Parent ID:
       Points:                |   Reviewer:
      Sponsor:                |
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 After I apply mix fix for #24642, I see this message in test-suite.log
 from test_rust.sh:
 {{{

    Doc-tests protover
 error[E0463]: can't find crate for `libc`
   --> /Users/nickm/src/tor/src/rust/protover/lib.rs:25:1
    |
 25 | extern crate libc;
    | ^^^^^^^^^^^^^^^^^^ can't find crate

 }}}

 I do not see the same message on my linux rust builds.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/24795>
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