Rollup of 8 pull requests

[matthiaskrgr]

Successful merges:

• docs(library/core/src/pin): fix typo "necessarily" -> "necessary" #139749 (docs(library/core/src/pin): fix typo "necessarily" -> "necessary")
• Simplify Vec::as_non_null implementation and make it const #140685 (Simplify Vec::as_non_null implementation and make it const)
• normalization: avoid incompletely constraining GAT args #140712 (normalization: avoid incompletely constraining GAT args)
• Improve dangerous_implicit_aurorefs diagnostic output #140768 (Improve dangerous_implicit_aurorefs diagnostic output)
• Flush errors before deep normalize in dropck_outlives #140947 (Flush errors before deep normalize in dropck_outlives)
• Remove #![feature(let_chains)] from library and src/librustdoc #140966 (Remove #![feature(let_chains)] from library and src/librustdoc)
• VxWorks: updates from recent libc versions #140990 (VxWorks: updates from recent libc versions)
• remove RustfmtState to reduce initial_rustfmt complexity #141027 (remove RustfmtState to reduce initial_rustfmt complexity)

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@rustbot modify labels: rollup

Create a similar rollup

[matthiaskrgr]

@bors r+ rollup=never p=5

[bors]

📌 Commit da78e8d has been approved by matthiaskrgr

It is now in the queue for this repository.

[bors]

⌛ Testing commit da78e8d with merge 985d931...

[rust-log-analyzer]

The job x86_64-rust-for-linux failed! Check out the build log: (web) (plain)

Click to see the possible cause of the failure (guessed by this bot)

  EXPORTS rust/exports_helpers_generated.h
error[E0658]: `let` expressions in this position are unstable
##[error]   --> /checkout/obj/build/x86_64-unknown-linux-gnu/stage2/lib/rustlib/src/rust/library/core/src/slice/index.rs:366:12
    |
366 |         if let Some(new_len) = usize::checked_sub(self.end, self.start)
    |            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = note: see issue #53667 <https://github.com/rust-lang/rust/issues/53667> for more information
    = help: add `#![feature(let_chains)]` to the crate attributes to enable
    = note: this compiler was built on 2025-05-15; consider upgrading it if it is out of date

error[E0658]: `let` expressions in this position are unstable
##[error]   --> /checkout/obj/build/x86_64-unknown-linux-gnu/stage2/lib/rustlib/src/rust/library/core/src/slice/index.rs:378:12
    |
378 |         if let Some(new_len) = usize::checked_sub(self.end, self.start)
    |            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = note: see issue #53667 <https://github.com/rust-lang/rust/issues/53667> for more information
    = help: add `#![feature(let_chains)]` to the crate attributes to enable
    = note: this compiler was built on 2025-05-15; consider upgrading it if it is out of date

error[E0658]: `let` expressions in this position are unstable
##[error]    --> /checkout/obj/build/x86_64-unknown-linux-gnu/stage2/lib/rustlib/src/rust/library/core/src/slice/iter.rs:1384:12
     |
1384 |         if let Some(rest) = self.v.get(n..)
     |            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
     |
     = note: see issue #53667 <https://github.com/rust-lang/rust/issues/53667> for more information
     = help: add `#![feature(let_chains)]` to the crate attributes to enable
     = note: this compiler was built on 2025-05-15; consider upgrading it if it is out of date

error[E0658]: `let` expressions in this position are unstable
##[error]    --> /checkout/obj/build/x86_64-unknown-linux-gnu/stage2/lib/rustlib/src/rust/library/core/src/slice/iter.rs:1385:16
     |
1385 |             && let Some(nth) = rest.get(..size)
     |                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
     |
     = note: see issue #53667 <https://github.com/rust-lang/rust/issues/53667> for more information
     = help: add `#![feature(let_chains)]` to the crate attributes to enable
     = note: this compiler was built on 2025-05-15; consider upgrading it if it is out of date

error[E0658]: `let` expressions in this position are unstable
##[error]  --> /checkout/obj/build/x86_64-unknown-linux-gnu/stage2/lib/rustlib/src/rust/library/core/src/str/iter.rs:59:20
   |
59 |                 && let Some(chunk) = chunks.next()
   |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: see issue #53667 <https://github.com/rust-lang/rust/issues/53667> for more information
   = help: add `#![feature(let_chains)]` to the crate attributes to enable
   = note: this compiler was built on 2025-05-15; consider upgrading it if it is out of date

error: aborting due to 5 previous errors

For more information about this error, try `rustc --explain E0658`.
make[2]: *** [rust/Makefile:491: rust/core.o] Error 1
make[1]: *** [/checkout/obj/rfl/linux/Makefile:1288: prepare] Error 2
make: *** [Makefile:248: __sub-make] Error 2
make: Leaving directory '/checkout/obj/rfl/linux'
  local time: Thu May 15 20:18:21 UTC 2025
  network time: Thu, 15 May 2025 20:18:21 GMT
****************************************************************************
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[bors]

💔 Test failed - checks-actions