[Bug 2021427] Re: rustc 1.66 and cargo 0.67 required by firefox 115

[Zixing Liu]

Hi there,

I have prepared the backports in this PPA: https://launchpad.net/~liushuyu-011/+archive/ubuntu/rust-updates.
Please check if you can build Firefox and Thunderbird using the backported toolchain.

Thank you

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https://bugs.launchpad.net/bugs/2021427

Title:
   rustc 1.66 and cargo 0.67 required by firefox 115

Status in cargo package in Ubuntu:
  New
Status in rustc package in Ubuntu:
  New

Bug description:
  Firefox 115+ requires rustc 1.66 and cargo 0.67 to build¹.

  The beta phase for Firefox 115.0 begins on 2023-06-05 and release
  candidates will be available from 2023-06-26.

  We will need these in all supported Ubuntu releases: bionic, focal,
  jammy, kinetic, lunar, mantic.

  ¹ https://bugzilla.mozilla.org/show_bug.cgi?id=1834958

  Rust toolchain upgrades are usually relatively safe from a FTBFS point
  of view, since new releases are subjected to a crater run, crater
  being a tool that compiles the entirety of the crates.io packages.

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