[Bug 2027942] Re: Upgrade Rust to 1.71.0

[Zixing Liu]

I have prepared preliminary packages in a PPA: https://launchpad.net/~liushuyu-011/+archive/ubuntu/rust-updates-1.71/+packages.
And also, its corresponding source at https://git.launchpad.net/~canonical-foundations/ubuntu/+source/rustc/tree/?h=merge-1.71.
You can find the autopkgtest results on this page: https://autopkgtest.ubuntu.com/results/autopkgtest-mantic-liushuyu-011-rust-updates-1.71/?format=plain.

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https://bugs.launchpad.net/bugs/2027942

Title:
  Upgrade Rust to 1.71.0

Status in rustc package in Ubuntu:
  In Progress

Bug description:
  Upgrade Rust to 1.71.0.

  Notable changes from upstream:

  * Added `*-unwind` ABI suffixes. This allows unwinding across the language boundaries (maybe useful for C++ exceptions).
  * Added `#[debug_visualizer]` attribute macro for customizing debugger helper scripts. Now you can replace Rust's default debugger helper script with yours.
  * Thread local variables can be constant-evaluated during the compile time.
  * Default LLVM version is now 16.
  * Added support for LoongArch* CPU architecture in the compiler (needs LLVM >= 16) and standard library (Tier 3 as of writing).
  * Many Microsoft(R) Windows(R) related changes (not applicable to Ubuntu).

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