Implement negation for wrapping numerals.

[notriddle]

Fixes #33037

[rust-highfive]

Thanks for the pull request, and welcome! The Rust team is excited to review your changes, and you should hear from @aturon (or someone else) soon.

If any changes to this PR are deemed necessary, please add them as extra commits. This ensures that the reviewer can see what has changed since they last reviewed the code. Due to the way GitHub handles out-of-date commits, this should also make it reasonably obvious what issues have or haven't been addressed. Large or tricky changes may require several passes of review and changes.

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[jonas-schievink]

Impls are insta-stable, stability attributes have no effect on them

[alexcrichton]

Thanks for the PR @notriddle! As @jonas-schievink mentioned we unfortunately don't read stability annotations on impl blocks, so this'll be instantly stable regardless so we may as well tag it with #[stable] with a since of 0.10.0

I'll tag this with T-libs as well to be sure it comes up during triage.

[alexcrichton]

The libs team discussed this during triage today and the decision was to merge. Thanks again for the PR @notriddle!

@bors: r+ 8a8c432

[bors]

⌛ Testing commit 8a8c432 with merge 3f65afa...

[bors]

💔 Test failed - auto-win-msvc-64-cargotest

[arielb1]

---- test_cargo_freshness::rebuild_tests_if_lib_changes stdout ----
    thread 'test_cargo_freshness::rebuild_tests_if_lib_changes' panicked at 'called `Result::unwrap()` on an `Err` value: Error { repr: Os { code: 32, message: "The process cannot access the file because it is being used by another process." } }', C:\bot\slave\auto-win-msvc-64-cargotest\build\src\libcore\result.rs:785
note: Run with `RUST_BACKTRACE=1` for a backtrace.


failures:
    test_cargo_freshness::rebuild_tests_if_lib_changes

cc @alexcrichton

can has RUST_BACKTRACE plz?

@bors retry

[bors]

⚡ Previous build results for auto-linux-32cross-opt, auto-linux-64-opt-rustbuild, auto-mac-cross-ios-opt are reusable. Rebuilding only auto-linux-32-nopt-t, auto-linux-32-opt, auto-linux-64-cargotest, auto-linux-64-cross-armhf, auto-linux-64-cross-armsf, auto-linux-64-cross-freebsd, auto-linux-64-cross-netbsd, auto-linux-64-debug-opt, auto-linux-64-nopt-t, auto-linux-64-opt, auto-linux-64-opt-mir, auto-linux-64-x-android-t, auto-linux-cross-opt, auto-linux-musl-64-opt, auto-mac-32-opt, auto-mac-64-nopt-t, auto-mac-64-opt, auto-mac-64-opt-rustbuild, auto-win-gnu-32-nopt-t, auto-win-gnu-32-opt, auto-win-gnu-32-opt-rustbuild, auto-win-gnu-64-nopt-t, auto-win-gnu-64-opt, auto-win-msvc-32-cross-opt, auto-win-msvc-32-opt, auto-win-msvc-64-cargotest, auto-win-msvc-64-opt, auto-win-msvc-64-opt-mir, auto-win-msvc-64-opt-rustbuild...

[bors]

☀️ Test successful - auto-linux-32-nopt-t, auto-linux-32-opt, auto-linux-32cross-opt, auto-linux-64-cargotest, auto-linux-64-cross-armhf, auto-linux-64-cross-armsf, auto-linux-64-cross-freebsd, auto-linux-64-cross-netbsd, auto-linux-64-debug-opt, auto-linux-64-nopt-t, auto-linux-64-opt, auto-linux-64-opt-mir, auto-linux-64-opt-rustbuild, auto-linux-64-x-android-t, auto-linux-cross-opt, auto-linux-musl-64-opt, auto-mac-32-opt, auto-mac-64-nopt-t, auto-mac-64-opt, auto-mac-64-opt-rustbuild, auto-mac-cross-ios-opt, auto-win-gnu-32-nopt-t, auto-win-gnu-32-opt, auto-win-gnu-32-opt-rustbuild, auto-win-gnu-64-nopt-t, auto-win-gnu-64-opt, auto-win-msvc-32-cross-opt, auto-win-msvc-32-opt, auto-win-msvc-64-cargotest, auto-win-msvc-64-opt, auto-win-msvc-64-opt-mir, auto-win-msvc-64-opt-rustbuild

[alexcrichton]

@arielb1

I've opened up rust-lang/cargo#2650, and I've seen this issue quite a few times on Cargo itself unfortunately.

I haven't been able to reproduce locally yet, though, to debug.