[Bug 2064517] [NEW] rustc 1.76 required by firefox 127

[Rico Tzschichholz]

Public bug reported:

Firefox 127+ requires rustc 1.76 to build¹².

The beta phase for Firefox 127.0 begins on 2024-05-13 and release
candidates will be available from 2024-06-11.

Eventually Thunderbird will need an updated rust toolchain as well.

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

¹ https://bugzilla.mozilla.org/show_bug.cgi?id=1890935
² https://phabricator.services.mozilla.com/D207239

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

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

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

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

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

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

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

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

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

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

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

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https://bugs.launchpad.net/bugs/2064517

Title:
  rustc 1.76 required by firefox 127

Status in rustc package in Ubuntu:
  New
Status in rustc source package in Focal:
  New
Status in rustc source package in Jammy:
  New
Status in rustc source package in Mantic:
  New
Status in rustc source package in Noble:
  New
Status in rustc source package in Oracular:
  New

Bug description:
  Firefox 127+ requires rustc 1.76 to build¹².

  The beta phase for Firefox 127.0 begins on 2024-05-13 and release
  candidates will be available from 2024-06-11.

  Eventually Thunderbird will need an updated rust toolchain as well.

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

  ¹ https://bugzilla.mozilla.org/show_bug.cgi?id=1890935
  ² https://phabricator.services.mozilla.com/D207239

  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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