[Bug 2027639] Re: Upgrade Rust to 1.70.0

[Zixing Liu]

I have prepared preliminary packages in a PPA: https://launchpad.net/~liushuyu-011/+archive/ubuntu/rust-updates-1.70/+packages.
And also, its corresponding source at https://git.launchpad.net/~canonical-foundations/ubuntu/+source/rustc/tree/?h=merge-1.70.
You can find the autopkgtest results on this page: https://autopkgtest.ubuntu.com/results/autopkgtest-mantic-liushuyu-011-rust-updates-1.70/?format=plain.

Please note that this version requires LLVM 16 (you can find a copy of
LLVM 16 in that PPA, which was copied from mantic-proposed).


** Changed in: rustc (Ubuntu)
       Status: Confirmed => In Progress

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https://bugs.launchpad.net/bugs/2027639

Title:
  Upgrade Rust to 1.70.0

Status in rustc package in Ubuntu:
  In Progress

Bug description:
  Upgrade Rust to 1.70.0.

  Notable changes from upstream:

  - OnceLock and OnceCell are now stabilized in the standard library. You no longer need to rely on an external crate for lazy initialized values.
  - Sparse registry is now enabled by default. No more waiting on the crates index updates!
  - std::io::IsTerminal is now stabilized in the standard library. Now you can determine whether a tty is attended without an external library!
  - Many APIs in the networking space are stabilized in the standard library.

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