[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
--------------------------+--------------------------------
 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 teor):

 Replying to [comment:3 teor]:
 > Replying to [comment:2 cypherpunks3]:
 > > But there's a bug upstream in rustfmt, which happens when it's
 configured with max_width=80 (like it is in `src/rust/.rustfmt.toml`).
 >
 > I'm not sure about the impact of the bug.
 > Does it produce ugly formatting, or is the syntax incorrect?
 >
 > Do you think we should give up on max_width=80?
 > We can reconsider wrapping to 80 characters when stable supports
 wrapping comments.
 >
 > If we want to match Tor's C files, we should be wrapping to 79
 characters:
 >
 https://gitweb.torproject.org/tor.git/tree/doc/HACKING/CodingStandards.md#n177

 I opened #27071 to deal with the max_width issue.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/26972#comment:9>
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