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

[Rico Tzschichholz]

Public bug reported:

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.

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

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

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

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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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