[Bug 2027639] Re: Upgrade Rust to 1.70.0

[Zixing Liu]

Lintian output for 1.70:

E: rustc source: field-too-long Vendored-Sources-Rust (9776 chars > 5000)
W: rustc source: bad-exception-format-in-dep5-copyright apache-2.0 with llvm-exception [debian/copyright:2412]
W: rustc source: bad-exception-format-in-dep5-copyright apache-2.0 with llvm-exception [debian/copyright:2442]
W: rustc source: mismatched-override missing-license-paragraph-in-dep5-copyright debian/copyright mpl-2.0+ [debian/source/lintian-overrides:15]
W: rustc source: missing-license-paragraph-in-dep5-copyright apache-2.0 with llvm-exception [debian/copyright:2442]
W: rustc source: missing-license-paragraph-in-dep5-copyright mpl-2.0+ [debian/copyright:1966]
W: rustc source: unknown-field Vendored-Sources-Rust
N: 0 hints overridden; 1 unused override
N: Some overrides were ignored.
N: Use --verbose for more information.
Finished running lintian.

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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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