Upgrade Rust to 1.70.0

[Zixing Liu]

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.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Zixing Liu (liushuyu-011)]

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).

[Zixing Liu (liushuyu-011)]

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.

[Launchpad Janitor (janitor)]

This bug was fixed in the package rustc - 1.70.0+dfsg0ubuntu1-0ubuntu1

---------------
rustc (1.70.0+dfsg0ubuntu1-0ubuntu1) mantic; urgency=medium

  * New upstream release 1.70.0 (LP: #2027639)
    - d/patches: Refresh patches
    - Upgraded LLVM to 16
  * d/patches/d-0000-ignore-removed-submodules.patch: Remove newly added Miri
    parts
  * d/patches/ubuntu-downgrade-libgit2-to-1.5.patch: Downgrade libgit2
    requirements to 1.5, since we don't have 1.6 in stable yet
  * d/patches/d-0002-mdbook-strip-embedded-libs.patch: Remove newly added
    mdbook bundled resources
  * d/patches/ubuntu-use-system-compiler-during-tests.patch: Avoid the need of
    downloaded rustc binaries during the bootstrapping tests
  * d/rust-src.install: Fix the config.example.toml installation, because the
    file name changed in Rust 1.70
  * d/patches/ubuntu-disable-fpmath-tests-for-i386.patch: Disable a test for
    testing machine epsilon, which x87 math is too inaccurate to pass the test
  * d/source/lintian-overrides: update overriden paths for doc-tests

 -- Zixing Liu <email address hidden> Thu, 13 Jul 2023 17:07:11 +0800