[Bug 2054410] [NEW] rustc 1.74 required by firefox 125

[Rico Tzschichholz]

Public bug reported:

Firefox 125+ requires rustc 1.74 to build¹².

The beta phase for Firefox 125.0 begins on 2024-03-18 and release
candidates will be available from 2024-04-16.

Eventually Thunderbird will need an updated rust toolchain as well.

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

¹ https://bugzilla.mozilla.org/show_bug.cgi?id=1880110
² https://phabricator.services.mozilla.com/D201947

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: rustc (Ubuntu)
     Importance: Undecided
         Status: New

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Title:
   rustc 1.74 required by firefox 125

Status in rustc package in Ubuntu:
  New

Bug description:
  Firefox 125+ requires rustc 1.74 to build¹².

  The beta phase for Firefox 125.0 begins on 2024-03-18 and release
  candidates will be available from 2024-04-16.

  Eventually Thunderbird will need an updated rust toolchain as well.

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

  ¹ https://bugzilla.mozilla.org/show_bug.cgi?id=1880110
  ² https://phabricator.services.mozilla.com/D201947

  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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