[tor-bugs] #26378 [Core Tor/Tor]: Travis fails on rust tests (test_rust.sh)

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#26378: Travis fails on rust tests (test_rust.sh)
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 Reporter:  asn             |          Owner:  (none)
     Type:  defect          |         Status:  new
 Priority:  Medium          |      Milestone:  Tor: 0.3.4.x-final
Component:  Core Tor/Tor    |        Version:
 Severity:  Normal          |     Resolution:
 Keywords:  rust tor-tests  |  Actual Points:
Parent ID:                  |         Points:
 Reviewer:                  |        Sponsor:
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Comment (by catalyst):

 Apparently rngs/jitter.rs in the `rand` crate won't build without `--cfg
 std`, and we set `default-features = false` for the `rand` crate in
 src/rust/crypto/Cargo.toml. Or it requires `default-features = false` for
 the `rand_core` crate as well for consistency.

 There seems to be a possible linker error now in our digest crate, which
 I'm trying to track down.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/26378#comment:2>
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