[Bug 1966200] Re: [FFe] rustc: Downgrade cargo from Recommends to Suggests

[Simon Chopin]

Uploaded with amended changelog. Thanks for the review!

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https://bugs.launchpad.net/bugs/1966200

Title:
  [FFe] rustc: Downgrade cargo from Recommends to Suggests

Status in rustc package in Ubuntu:
  Triaged

Bug description:
  Hi,

  I'd like to upload a new rustc version (see attached debdiff). In
  addition to the obvious security fix, this version would downgrade the
  Recommends: cargo to a mere Suggests: for the rustc binary.

  The rationale behind the change is that we'd like to promote rustc to
  main (see https://bugs.launchpad.net/ubuntu/+source/rustc/+bug/1957932
  for details) and cargo isn't ready to be promoted.

  I expect the impact on the archive to be minimal, as there are only
  two direct reverse-dependencies on rustc:

  ❯ reverse-depends rustc
  Reverse-Depends
  * cargo
  * rust-all

  rust-all already has its own Depends: relationship to cargo, and as
  such isn't relying on rustc to provide it.

  AFAIK our builders don't consider Recommends dependencies, so this
  change shouldn't result in build breakages.

  My educated guess is that any user that wishes to install Rust and
  does *not* follow that community's standard way of doing things
  (bypassing system packages) would install rust-all or cargo directly,
  not expecting rustc to provide the higher-level tooling.

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