[tor-bugs] #26972 [Core Tor/Tor]: Create CI task to ensure that all Rust files have been formatted with rustfmt

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#26972: Create CI task to ensure that all Rust files have been formatted with
rustfmt
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 Reporter:  chelseakomlo  |          Owner:  teor
     Type:  enhancement   |         Status:  needs_revision
 Priority:  Medium        |      Milestone:
Component:  Core Tor/Tor  |        Version:
 Severity:  Normal        |     Resolution:
 Keywords:  rust          |  Actual Points:
Parent ID:                |         Points:
 Reviewer:  teor          |        Sponsor:
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Comment (by cypherpunks3):

 Replying to [comment:5 teor]:
 > The travis build failed, due to old autoconf macros:
 > https://travis-ci.org/teor2345/tor/builds/412925525

 According to the log, the source of the warning is configure.ac, and use
 of AC_WARN which none of the patches touched, or used? How would you begin
 to fix that?

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/26972#comment:7>
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