[tor-bugs] #26245 [Core Tor/Tor]: Unused Rust code warnings

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#26245: Unused Rust code warnings
------------------------------+----------------------------------
     Reporter:  teor          |      Owner:  (none)
         Type:  defect        |     Status:  new
     Priority:  Medium        |  Milestone:  Tor: 0.3.4.x-final
    Component:  Core Tor/Tor  |    Version:  Tor: 0.3.4.1-alpha
     Severity:  Normal        |   Keywords:  034-must-maybe, rust
Actual Points:                |  Parent ID:
       Points:                |   Reviewer:
      Sponsor:                |
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 Recent Rust versions (1.26.1) report the following warnings on master:
 {{{
 warning: constant item is never used: `N_DIGEST_ALGORITHMS`
   --> external/crypto_digest.rs:74:1
    |
 74 | const N_DIGEST_ALGORITHMS: usize = DIGEST_SHA3_512 as usize + 1;
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = note: #[warn(dead_code)] on by default

 warning: type alias is never used: `smartlist_t`
    --> external/crypto_digest.rs:120:1
     |
 120 | type smartlist_t = Stringlist;
     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 }}}

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/26245>
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