[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:  Tor: 0.3.5.x-final
Component:  Core Tor/Tor        |        Version:
 Severity:  Normal              |     Resolution:
 Keywords:  rust, 036-proposed  |  Actual Points:
Parent ID:  #24629              |         Points:
 Reviewer:  teor                |        Sponsor:
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Comment (by teor):

 Please open a new ticket in 0.3.6 with a new branch containing the travis
 commit, so we remember to merge it when rustfmt 0.99.1 becomes stable.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/26972#comment:20>
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