[Bug 2039341] [NEW] rustc 1.70 and cargo 0.71 required by firefox 120

[Rico Tzschichholz]

Public bug reported:

Firefox 120+ requires rustc 1.70 and cargo 0.71 to build¹².

The beta phase for Firefox 120.0 begins on 2023-10-23 and release
candidates will be available from 2023-11-13.

Eventually Thunderbird will need an updated rust toolchain as well.

We will need these in all supported releases of Ubuntu: focal, jammy,
lunar.

¹ https://bugzilla.mozilla.org/show_bug.cgi?id=1857172
² https://phabricator.services.mozilla.com/D190161

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.

** Affects: cargo (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: rustc (Ubuntu)
     Importance: Undecided
         Status: New

** Also affects: rustc (Ubuntu)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/2039341

Title:
  rustc 1.70 and cargo 0.71 required by firefox 120

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

Bug description:
  Firefox 120+ requires rustc 1.70 and cargo 0.71 to build¹².

  The beta phase for Firefox 120.0 begins on 2023-10-23 and release
  candidates will be available from 2023-11-13.

  Eventually Thunderbird will need an updated rust toolchain as well.

  We will need these in all supported releases of Ubuntu: focal, jammy,
  lunar.

  ¹ https://bugzilla.mozilla.org/show_bug.cgi?id=1857172
  ² https://phabricator.services.mozilla.com/D190161

  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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