Rollup of 5 pull requests

[matthiaskrgr]

Successful merges:

• Improve several Read implementations #122441 (Improve several Read implementations)
• Various improvements to entrypoint code #124584 (Various improvements to entrypoint code)
• Use unchecked_sub in split_at #124699 (Use unchecked_sub in split_at)
• Fix ignored tests for formatting #124704 (Fix ignored tests for formatting)
• Miri subtree update #124709 (Miri subtree update)

r? @ghost
@rustbot modify labels: rollup

Create a similar rollup

[matthiaskrgr]

@bors r+ rollup=never p=5

[bors]

📌 Commit ee62903 has been approved by matthiaskrgr

It is now in the queue for this repository.

[bors]

⌛ Testing commit ee62903 with merge 7852822...

[rust-log-analyzer]

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

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

[bors]

💔 Test failed - checks-actions

[jieyouxu]

Probably #122441?

[matthiaskrgr]

@bors retry

[bors]

⌛ Testing commit ee62903 with merge 8ea632f...

[bors]

☔ The latest upstream changes (presumably #124703) made this pull request unmergeable. Please resolve the merge conflicts.

[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)

tests/fail/function_calls/exported_symbol_bad_unwind2.rs (revision `extern_block`) ... ok
tests/fail/function_calls/exported_symbol_bad_unwind2.rs (revision `definition`) ... ok
tests/fail/function_calls/exported_symbol_bad_unwind2.rs (revision `both`) ... ok

FAILED TEST: tests/fail/intrinsic_fallback_checks_ub.rs
command: MIRI_ENV_VAR_TEST="0" MIRI_TEMP="/tmp/miri-uitest-mG0Y7t" RUST_BACKTRACE="1" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage1/bin/miri" "--error-format=json" "--sysroot=/checkout/obj/build/x86_64-unknown-linux-gnu/miri-sysroot" "-Dwarnings" "-Dunused" "-Ainternal_features" "-Zmiri-provenance-gc=1" "-Zui-testing" "--target" "x86_64-unknown-linux-gnu" "--out-dir" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage1-tools/ui/tests/fail" "tests/fail/intrinsic_fallback_checks_ub.rs" "--edition" "2021"
error: actual output differed from expected
error: actual output differed from expected
Execute `./miri test --bless` to update `tests/fail/intrinsic_fallback_checks_ub.stderr` to the actual output
--- tests/fail/intrinsic_fallback_checks_ub.stderr
+++ <stderr output>
 error: unsupported operation: miri can only use intrinsic fallback bodies that check UB. After verifying that `ptr_guaranteed_cmp` does so, add the `#[miri::intrinsic_fallback_checks_ub]` attribute to it; also ping @rust-lang/miri when you do that
   --> $DIR/intrinsic_fallback_checks_ub.rs:LL:CC
... 2 lines skipped ...
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ miri can only use intrinsic fallback bodies that check UB. After verifying that `ptr_guaranteed_cmp` does so, add the `#[miri::intrinsic_fallback_checks_ub]` attribute to it; also ping @rust-lang/miri when you do that
-   = help: this is likely not a bug in the program; it indicates that the program performed an operation that the interpreter does not support
+   = help: this is likely not a bug in the program; it indicates that the program performed an operation that Miri does not support
    = note: BACKTRACE:
    = note: inside `main` at $DIR/intrinsic_fallback_checks_ub.rs:LL:CC
    = note: inside `main` at $DIR/intrinsic_fallback_checks_ub.rs:LL:CC
... 3 lines skipped ...
 error: aborting due to 1 previous error
 


full stderr:
error: unsupported operation: miri can only use intrinsic fallback bodies that check UB. After verifying that `ptr_guaranteed_cmp` does so, add the `#[miri::intrinsic_fallback_checks_ub]` attribute to it; also ping @rust-lang/miri when you do that
##[error]  --> tests/fail/intrinsic_fallback_checks_ub.rs:12:5
   |
LL |     ptr_guaranteed_cmp::<()>(std::ptr::null(), std::ptr::null());
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ miri can only use intrinsic fallback bodies that check UB. After verifying that `ptr_guaranteed_cmp` does so, add the `#[miri::intrinsic_fallback_checks_ub]` attribute to it; also ping @rust-lang/miri when you do that
   = help: this is likely not a bug in the program; it indicates that the program performed an operation that Miri does not support
   = help: this is likely not a bug in the program; it indicates that the program performed an operation that Miri does not support
   = help: if this is a basic API commonly used on this target, please report an issue; but note that Miri does not aim to support every FFI function out there
   = note: inside `main` at tests/fail/intrinsic_fallback_checks_ub.rs:12:5: 12:65

note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace

---
Error: 
   0: ui tests in tests/fail for x86_64-unknown-linux-gnu failed
   1: tests failed

Backtrace omitted. Run with RUST_BACKTRACE=1 environment variable to display it.
Run with RUST_BACKTRACE=full to include source snippets.
error: test failed, to rerun pass `--test ui`
Caused by:
Caused by:
  process didn't exit successfully: `/checkout/obj/build/x86_64-unknown-linux-gnu/stage1-tools/x86_64-unknown-linux-gnu/release/deps/ui-80d560a5f7abc700` (exit status: 1)
  local time: Sat May  4 16:06:52 UTC 2024
  network time: Sat, 04 May 2024 16:06:52 GMT
##[error]Process completed with exit code 1.
Post job cleanup.

[bors]

💔 Test failed - checks-actions

[RalfJung]

#124709 had a conflict, strange that there wasn't also a conflict here...