Rollup of 8 pull requests

[matthiaskrgr]

Successful merges:

• Make some Clone impls const #91804 (Make some Clone impls const)
• Mention intent of From trait in its docs #92541 (Mention intent of From trait in its docs)
• Use MaybeUninit in VecDeque to remove the undefined behavior of slice #94472 (Use MaybeUninit in VecDeque to remove the undefined behavior of slice)
• Statically compile libstdc++ everywhere if asked #94719 (Statically compile libstdc++ everywhere if asked)
• Suggest if let/let_else for refutable pat in let #94739 (Suggest if let/let_else for refutable pat in let)
• Unify impl blocks by wrapping them into a div #94740 (Unify impl blocks by wrapping them into a div)
• Improve rustdoc book #94753 (Improve rustdoc book)
• Add documentation about lifetimes to thread::scope. #94763 (Add documentation about lifetimes to thread::scope.)

Failed merges:

r? @ghost
@rustbot modify labels: rollup

Create a similar rollup

[matthiaskrgr]

@bors r+ rollup=never p=8

[bors]

📌 Commit 5bb9687 has been approved by matthiaskrgr

[bors]

⌛ Testing commit 5bb9687 with merge 1d2f5e378a11c54beb51a33c800f8d6dec27ce95...

[bors]

💔 Test failed - checks-actions

[rust-log-analyzer]

The job x86_64-gnu-tools failed! Check out the build log: (web) (plain)

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

test [ui] run-pass/write-bytes.rs ... ok
diff of stdout:

-[2, 2] Iter([2, 2], [])
+[2, 2] Iter([core::mem::maybe_uninit::MaybeUninit<alloc::boxed::Box<i32>>, core::mem::maybe_uninit::MaybeUninit<alloc::boxed::Box<i32>>], [])
 

The actual stdout differed from the expected stdout.
The actual stdout differed from the expected stdout.
Actual stdout saved to /tmp/compiletesttCVXUt/vecdeque.stage-id.stdout
To only update this specific test, also pass `--test-args vecdeque.rs`

error: 1 errors occurred comparing output.
status: exit status: 0
status: exit status: 0
command: "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2-tools-bin/miri" "tests/run-pass/vecdeque.rs" "-L" "/tmp/compiletesttCVXUt" "--target=x86_64-unknown-linux-gnu" "--error-format" "json" "-C" "prefer-dynamic" "-o" "/tmp/compiletesttCVXUt/vecdeque.stage-id" "-A" "unused" "--edition" "2018" "-Astable-features" "--sysroot" "/home/user/.cache/miri/HOST" "-Zmiri-tag-raw-pointers" "-L" "/tmp/compiletesttCVXUt/vecdeque.stage-id.aux"
------------------------------------------
------------------------------------------
[2, 2] Iter([core::mem::maybe_uninit::MaybeUninit<alloc::boxed::Box<i32>>, core::mem::maybe_uninit::MaybeUninit<alloc::boxed::Box<i32>>], [])

------------------------------------------
stderr:
------------------------------------------
---
.......... (60/61)
.          (61/61)


/checkout/src/test/rustdoc-gui/mobile.goml mobile... FAILED
[ERROR] (line 27) Error: Evaluation failed: assert didn't fail: for command `compare-elements-position-near-false: ("#preferred-light-theme .setting-name", "#preferred-light-theme .choice", {"y": 16})`
Build completed unsuccessfully in 0:00:19

[rust-log-analyzer]

The job x86_64-gnu-tools failed! Check out the build log: (web) (plain)

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

  IMAGE: x86_64-gnu-tools
##[endgroup]
From https://github.com/rust-lang/rust
 * branch              master     -> FETCH_HEAD
Searching for toolstate changes between 10dccdc7fcbdc64ee9efe2c1ed975ab8c1d61287 and 7e2b7dafd836002d00d68cff01784402d472f115
Rustdoc was updated
##[group]Run src/ci/scripts/verify-channel.sh
src/ci/scripts/verify-channel.sh
shell: /usr/bin/bash --noprofile --norc -e -o pipefail {0}
env:
---
test [ui] run-pass/u128.rs ... ok
diff of stdout:

-[2, 2] Iter([2, 2], [])
+[2, 2] Iter([core::mem::maybe_uninit::MaybeUninit<alloc::boxed::Box<i32>>, core::mem::maybe_uninit::MaybeUninit<alloc::boxed::Box<i32>>], [])
 

The actual stdout differed from the expected stdout.
The actual stdout differed from the expected stdout.
Actual stdout saved to /tmp/compiletestKRCIvB/vecdeque.stage-id.stdout
To only update this specific test, also pass `--test-args vecdeque.rs`

error: 1 errors occurred comparing output.
status: exit status: 0
status: exit status: 0
command: "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2-tools-bin/miri" "tests/run-pass/vecdeque.rs" "-L" "/tmp/compiletestKRCIvB" "--target=x86_64-unknown-linux-gnu" "--error-format" "json" "-C" "prefer-dynamic" "-o" "/tmp/compiletestKRCIvB/vecdeque.stage-id" "-A" "unused" "--edition" "2018" "-Astable-features" "--sysroot" "/home/user/.cache/miri/HOST" "-Zmiri-tag-raw-pointers" "-L" "/tmp/compiletestKRCIvB/vecdeque.stage-id.aux"
------------------------------------------
------------------------------------------
[2, 2] Iter([core::mem::maybe_uninit::MaybeUninit<alloc::boxed::Box<i32>>, core::mem::maybe_uninit::MaybeUninit<alloc::boxed::Box<i32>>], [])

------------------------------------------
stderr:
------------------------------------------
---
.......... (60/61)
.          (61/61)


/checkout/src/test/rustdoc-gui/mobile.goml mobile... FAILED
[ERROR] (line 27) Error: Evaluation failed: assert didn't fail: for command `compare-elements-position-near-false: ("#preferred-light-theme .setting-name", "#preferred-light-theme .choice", {"y": 16})`
Build completed unsuccessfully in 0:00:21