[Bug 1942394] Re: [MIR] mdevctl 1.0.0 (rust switch)

[Seth Arnold]

There's more build warnings than I usually like to see:

$ grep warning: mdevctl_1.1.0-1ubuntu1~ppa2_amd64-2022-08-09T15\:02\:28Z.build | sort | uniq -c | sort -nr
    126 warning: trait objects without an explicit `dyn` are deprecated
     88     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
     28    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
     14 warning: unnecessary parentheses around block return value
     10      = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
      9 warning: panic message is not a string literal
      8 warning: use of deprecated associated function `std::error::Error::description`: use the Display impl or to_string()
      8 warning: use of deprecated associated function `bitflags::core::str::<impl str>::trim_left_matches`: superseded by `trim_start_matches`
      6 warning: unnecessary trailing semicolon
      6 warning: unnecessary parentheses around type
      4    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2018!
      4 warning: anonymous parameters are deprecated and will be removed in the next edition
      3 dpkg-scanpackages: warning: Packages in archive but missing from override file:
...

some of these are obviously a waste of time but some of them might
represent challenges backporting fixes from the future.

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Title:
  [MIR] mdevctl 1.0.0 (rust switch)

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