[tor-bugs] #25727 [Core Tor/Tor]: Add bool types to Rust coding standards guidelines

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#25727: Add bool types to Rust coding standards guidelines
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 Reporter:  isis                     |          Owner:  isis
     Type:  enhancement              |         Status:  needs_revision
 Priority:  Medium                   |      Milestone:  Tor: 0.3.4.x-final
Component:  Core Tor/Tor             |        Version:
 Severity:  Normal                   |     Resolution:
 Keywords:  torspec, rust, fast-fix  |  Actual Points:
Parent ID:                           |         Points:  .1
 Reviewer:  catalyst                 |        Sponsor:  SponsorM-can
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Changes (by catalyst):

 * status:  needs_review => needs_revision


Comment:

 Summarizing yesterday's IRC discussion:
 * Rust has debated whether Rust's `bool` is identical to C99's `_Bool` for
 a while.
 * Rust now [https://github.com/rust-lang/rust/pull/46156 specifies] that
 its `bool` is one byte.
 * There is a [https://github.com/rust-lang/rfcs/pull/954 postponed RFC] to
 define Rust's `bool` and C99's `_Bool` to be FFI-compatible.
 We should either postpone merging this until Rust decides to accept RFC
 954 or point to that RFC (and maybe the follow up RFC 992) in our doc.
 There seems to be a consensus that it should be accepted but it seems they
 haven't gone through the formalities yet.

 This patch also adds a non-ASCII character in a file that previously had
 none.  I think we lack a style guide that covers the acceptability of non-
 ASCII in various files, but this is a change.  On the other hand
 CodingStandardsRust.md already had some non-ASCII characters in it so
 maybe we don't actually care that much?

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/25727#comment:3>
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