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Rollup of 4 pull requests#156285

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JonathanBrouwer wants to merge 8 commits intorust-lang:mainfrom
JonathanBrouwer:rollup-bxLhwFA
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Rollup of 4 pull requests#156285
JonathanBrouwer wants to merge 8 commits intorust-lang:mainfrom
JonathanBrouwer:rollup-bxLhwFA

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Successful merges:

r? @ghost

Create a similar rollup

Zalathar and others added 8 commits March 12, 2026 17:37
…r=lcnr

Skipping borrowck because of trivial const

r? @saethlin

the [assertion](https://github.com/chenyukang/rust/blob/31c38576a4cf1a0864af536f62d11f829db1c7c8/compiler/rustc_mir_transform/src/lib.rs#L424) is added in PR: rust-lang#148040

I think we also need to skip trvial const in `mir_borrowck`.
core: drop unmapped ZSTs in array `map`

Fixes rust-lang#152211.
Alternative to rust-lang#152220 and rust-lang#152248.

This makes the `Drain` type use the same ZST-handling strategy as `slice::IterMut`, which stores the remaining length instead of a one-past-the-end pointer when the type is a ZST. I've also removed the const-generic `N` parameter from `Drain` to avoid unnecessary monomorphizations.
Add a suite of ChunkedBitSet union/subtract/intersect test scenarios

While working on rust-lang#153754, I found that these code paths are under-tested.
Add `sync` option to `-Z threads` to force synchronization on one thread

This adds a `sync` option to `-Z threads` to force synchronization while still using one thread. This is useful to measure overhead of synchronization without the noise of additional threads.
@rust-bors rust-bors Bot added the rollup A PR which is a rollup label May 7, 2026
@rustbot rustbot added A-query-system Area: The rustc query system (https://rustc-dev-guide.rust-lang.org/query.html) S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. T-libs Relevant to the library team, which will review and decide on the PR/issue. WG-trait-system-refactor The Rustc Trait System Refactor Initiative (-Znext-solver) labels May 7, 2026
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@bors r+ rollup=never p=5

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rust-bors Bot commented May 7, 2026

📌 Commit 79792ff has been approved by JonathanBrouwer

It is now in the queue for this repository.

@rust-bors rust-bors Bot added S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels May 7, 2026
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rust-bors Bot pushed a commit that referenced this pull request May 7, 2026
…uwer

Rollup of 4 pull requests

Successful merges:

 - #149468 (Skipping borrowck because of trivial const)
 - #152487 (core: drop unmapped ZSTs in array `map`)
 - #153759 (Add a suite of ChunkedBitSet union/subtract/intersect test scenarios)
 - #156198 (Add `sync` option to `-Z threads` to force synchronization on one thread)
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The job x86_64-gnu-llvm-21-1 failed! Check out the build log: (web) (plain enhanced) (plain)

Click to see the possible cause of the failure (guessed by this bot)
test expr_store::scope::tests::test_resolve_local_name_shadow ... ok
test expr_store::tests::body::async_fn_weird_param_patterns ... ok
test expr_store::tests::body::block::inner_item_smoke ... ok
test expr_store::scope::tests::while_let_adds_binding ... ok
error: test failed, to rerun pass `-p hir-def --lib`

Caused by:
  process didn't exit successfully: `/checkout/obj/build/x86_64-unknown-linux-gnu/stage2-tools/x86_64-unknown-linux-gnu/release/deps/hir_def-c439368f2b64a049 '--skip=tests::smoke_test_real_sysroot_cargo' --skip=check_code_formatting -Z unstable-options --format json` (signal: 7, SIGBUS: access to undefined memory)
Bootstrap failed while executing `--stage 2 test --skip tests --skip coverage-map --skip coverage-run --skip library --skip tidyselftest`
Build completed unsuccessfully in 1:10:52
  local time: Thu May  7 19:43:54 UTC 2026
  network time: Thu, 07 May 2026 19:43:54 GMT
##[error]Process completed with exit code 1.

@rust-bors rust-bors Bot added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. and removed S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. labels May 7, 2026
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rust-bors Bot commented May 7, 2026

💔 Test for 87e5848 failed: CI. Failed job:

@rust-bors rust-bors Bot added the S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. label May 7, 2026
@rustbot rustbot removed the S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. label May 7, 2026
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rust-bors Bot commented May 7, 2026

This pull request was unapproved due to being closed.

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A-query-system Area: The rustc query system (https://rustc-dev-guide.rust-lang.org/query.html) rollup A PR which is a rollup S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. T-libs Relevant to the library team, which will review and decide on the PR/issue. WG-trait-system-refactor The Rustc Trait System Refactor Initiative (-Znext-solver)

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7 participants