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Initial implementation of rustfixable unused_imports lint
This PR adds the initial implementation of rustfixable `unused_imports` lint. The implementation works, but rustfix is not able to apply all the suggestions until https://github.com/rust-lang/rust/issues/53934 is fixed. It also needs https://github.com/rust-lang/rust/pull/58296 to hide the suggested note since it's really useless.
cc https://github.com/rust-lang/rust/issues/47888
<details><summary><code>cargo fix</code> in action on the <code>unused_imports</code> lint</summary>
</details>
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Const-stabilize `const_int_ops` + `const_ip`
r? @oli-obk
## Note for relnotes: This PR includes https://github.com/rust-lang/rust/pull/57105.
I've added T-lang since this affects intrinsics and the operational semantics of Rust's `const fn` fragment.
## Stable APIs proposed for constification
+ `const_int_ops`:
+ `count_ones`
+ `count_zeros`
+ `leading_zeros`
+ `trailing_zeros`
+ `swap_bytes`
+ `from_be`
+ `from_le`
+ `to_be`
+ `to_le`
+ `const_ip`
+ `Ipv4Addr::new`
## Unstable APIs constified
+ `const_int_conversion`:
+ `reverse_bits`
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Fix broken links to second edition TRPL.
Fixes https://github.com/rust-lang/rust/issues/57104.
Remove `second-edition/` from TRPL hyperlinks.
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Fixes https://github.com/rust-lang/rust/issues/57104.
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Replace "integral variable" with "integer" and replace
"floating-point variable" with "floating-point number" to make the
message less confusing.
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I also added `// skip-codegen` to each one, to address potential concerns
that this change would otherwise slow down our test suite spending time
generating code for files that are really just meant to be checks of
compiler diagnostics.
(However, I will say: My preference is to not use `// skip-codegen` if
one can avoid it. We can use all the testing of how we drive LLVM that
we can get...)
(Updated post rebase.)
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