[Bug 2111325] Re: Rustc 1.81 needed in 24.04 to build chromium 138

[Nathan Teodosio]

*** This bug is a duplicate of bug 2100492 ***
    https://bugs.launchpad.net/bugs/2100492

** This bug has been marked a duplicate of bug 2100492
   rustc 1.82 required by firefox 137

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Title:
  Rustc 1.81 needed in 24.04 to build chromium 138

Status in rustc package in Ubuntu:
  New

Bug description:
  Chromium dev builds started failing due to use of unstable feature:

  :: error[E0658]: use of unstable library feature 'error_in_core'
  ::   --> ../../third_party/rust/chromium_crates_io/vendor/zerovec-v0_11/src/varzerovec/error.rs:15:6
  ::    |
  :: 15 | impl core::error::Error for VarZeroVecFormatError {}
  ::    |      ^^^^^^^^^^^^^^^^^^
  ::    |
  ::    = note: see issue #103765 <https://github.com/rust-lang/rust/issues/103765> for more information
  ::    = help: add `#![feature(error_in_core)]` to the crate attributes to enable
  ::    = note: this compiler was built on 2024-08-06; consider upgrading it if it is out of date
  ::
  :: error[E0658]: use of unstable library feature 'error_in_core'
  ::    --> ../../third_party/rust/chromium_crates_io/vendor/zerovec-v0_11/src/ule/mod.rs:451:6
  ::     |
  :: 451 | impl core::error::Error for UleError {}
  ::     |      ^^^^^^^^^^^^^^^^^^
  ::     |
  ::     = note: see issue #103765 <https://github.com/rust-lang/rust/issues/103765> for more information
  ::     = help: add `#![feature(error_in_core)]` to the crate attributes to enable
  ::     = note: this compiler was built on 2024-08-06; consider upgrading it if it is out of date

  We need Rustc 1.81 for that: https://doc.rust-
  lang.org/nightly/core/error/trait.Error.html. But maybe it would be
  wiser to backport Rust 1.82 because that's what the Cargo.toml of the
  component that fails to build specify: https://github.com/unicode-
  org/icu4x/blob/33679069702e826069fe3ebe4198fcee762effd1/Cargo.toml#L111.

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