Use `ThinVec` more in the AST#158755

Merged

rust-bors[bot] merged 3 commits into

rust-lang:mainfrom

nnethercote:ast-ThinVec

Jul 6, 2026

nnethercote commented Jul 4, 2026 •

edited

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For consistency; it has negligible effects on perf. Details in individual commits.

nnethercote added 3 commits

July 4, 2026 09:55


          Add some more AST size assertions

ba53d1b


          Use ThinVec in Expr::OffsetOf

b14e429

Because we use `ThinVec` rather than `Vec` almost everywhere else in the
AST.


          Use ThinVec in GenericBounds

3a0a977

Because we use `ThinVec` rather than `Vec` almost everywhere else in the
AST.

rustbot added S-waiting-on-author T-compiler labels

nnethercote commented Jul 4, 2026

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@bors try @rust-timer queue

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rust-bors Bot pushed a commit that referenced this pull request


          Auto merge of #158755 - nnethercote:ast-ThinVec, r=<try>

973fa09

Use `ThinVec` more in the AST

rust-bors Bot commented Jul 4, 2026

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☀️ Try build successful (CI)
Build commit: 973fa09 (973fa097ee83e915d5a9ba83a9cbb259b4573170)
Base parent: c397dae (c397dae808f70caebab1fc4e11b3edf7e59f58c7)

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rust-timer commented Jul 4, 2026

Collaborator

Finished benchmarking commit (973fa09): comparison URL.

Overall result: no relevant changes - no action needed

Benchmarking means the PR may be perf-sensitive. Consider adding rollup=never if this change is not fit for rolling up.

@rustbot label: -S-waiting-on-perf -perf-regression

Instruction count

This perf run didn't have relevant results for this metric.

Max RSS (memory usage)

Results (primary 0.3%, secondary -5.6%)

A less reliable metric. May be of interest, but not used to determine the overall result above.

	mean	range	count
Regressions ❌ (primary)	0.9%	[0.8%, 1.0%]	3
Regressions ❌ (secondary)	-	-	0
Improvements ✅ (primary)	-1.4%	[-1.4%, -1.4%]	1
Improvements ✅ (secondary)	-5.6%	[-5.7%, -5.5%]	2
All ❌✅ (primary)	0.3%	[-1.4%, 1.0%]	4

Cycles

Results (primary 2.2%, secondary -3.5%)

A less reliable metric. May be of interest, but not used to determine the overall result above.

	mean	range	count
Regressions ❌ (primary)	2.2%	[2.2%, 2.2%]	1
Regressions ❌ (secondary)	-	-	0
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-3.5%	[-5.5%, -2.4%]	3
All ❌✅ (primary)	2.2%	[2.2%, 2.2%]	1

Binary size

This perf run didn't have relevant results for this metric.

Bootstrap: 485.944s -> 484.62s (-0.27%)
Artifact size: 393.37 MiB -> 393.83 MiB (0.12%)

rustbot removed the S-waiting-on-perf label

rustbot assigned mejrs

nnethercote marked this pull request as ready for review

July 4, 2026 12:44

rustbot commented Jul 4, 2026

Collaborator

The parser was modified, potentially altering the grammar of (stable) Rust
which would be a breaking change.

rustbot added S-waiting-on-review and removed S-waiting-on-author labels

mejrs reviewed

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mejrs left a comment •

edited by rustbot

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@bors r+ rollup

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rust-bors Bot commented Jul 4, 2026

Contributor

📌 Commit 3a0a977 has been approved by mejrs

It is now in the queue for this repository.

🌲 The tree is currently closed for pull requests below priority 1000. This pull request will be tested once the tree is reopened.

rust-bors Bot added S-waiting-on-bors and removed S-waiting-on-review labels

jhpratt added a commit to jhpratt/rust that referenced this pull request


          Rollup merge of rust-lang#158755 - nnethercote:ast-ThinVec, r=mejrs

9b6e394

Use `ThinVec` more in the AST

For consistency; it has negligible effects on perf. Details in individual commits.

r? @mejrs

jhpratt mentioned this pull request

Rollup of 13 pull requests #158790

Closed

jhpratt added a commit to jhpratt/rust that referenced this pull request


          Rollup merge of rust-lang#158755 - nnethercote:ast-ThinVec, r=mejrs

aef9bb3

Use `ThinVec` more in the AST

For consistency; it has negligible effects on perf. Details in individual commits.

r? @mejrs

jhpratt mentioned this pull request

Rollup of 12 pull requests #158793

Closed

JonathanBrouwer added a commit to JonathanBrouwer/rust that referenced this pull request


          Rollup merge of rust-lang#158755 - nnethercote:ast-ThinVec, r=mejrs

ea1c0f3

Use `ThinVec` more in the AST

For consistency; it has negligible effects on perf. Details in individual commits.

r? @mejrs

JonathanBrouwer mentioned this pull request

Rollup of 12 pull requests #158806

Closed

JonathanBrouwer added a commit to JonathanBrouwer/rust that referenced this pull request


          Rollup merge of rust-lang#158755 - nnethercote:ast-ThinVec, r=mejrs

8b1ee68

Use `ThinVec` more in the AST

For consistency; it has negligible effects on perf. Details in individual commits.

r? @mejrs

JonathanBrouwer mentioned this pull request

Rollup of 12 pull requests #158815

Closed

JonathanBrouwer added a commit to JonathanBrouwer/rust that referenced this pull request


          Rollup merge of rust-lang#158755 - nnethercote:ast-ThinVec, r=mejrs

f991496

Use `ThinVec` more in the AST

For consistency; it has negligible effects on perf. Details in individual commits.

r? @mejrs

JonathanBrouwer mentioned this pull request

Rollup of 16 pull requests #158828

Closed

jhpratt added a commit to jhpratt/rust that referenced this pull request


          Rollup merge of rust-lang#158755 - nnethercote:ast-ThinVec, r=mejrs

9ab04cf

Use `ThinVec` more in the AST

For consistency; it has negligible effects on perf. Details in individual commits.

r? @mejrs

jhpratt mentioned this pull request

Rollup of 20 pull requests #158837

Closed

rust-bors Bot pushed a commit that referenced this pull request


          Auto merge of #158837 - jhpratt:rollup-KBtLguc, r=jhpratt

67e9636

Rollup of 20 pull requests

Successful merges:

 - #158377 (add `-Zforce-intrinsic-fallback` flag)
 - #158642 (Clarify some interning details)
 - #158743 (Look for cdb location in the registry first)
 - #158775 (bootstrap: only encode RUSTFLAGS when a flag contains a space)
 - #158782 (Add and use cfg(target_has_threads) to enforce no_thread impl usage)
 - #158785 (hook intrinsic-test into aarch64-gnu)
 - #157734 (Stabilize `local_key_cell_update`)
 - #158183 (std: allocate less memory in `current_exe` for OpenBSD)
 - #158671 (Move tests batch 17)
 - #158730 (Update `FIXME(static_mut_refs)` comments)
 - #158752 (Reorganize `tests/ui/issues` [18/N])
 - #158755 (Use `ThinVec` more in the AST)
 - #158757 (Fix incorrect tracking issue for `read_le`/`read_be`)
 - #158765 (Fix ICE on non-ident path in `doc(auto_cfg values)`)
 - #158771 (library: expand HashSet::extract_if coverage)
 - #158772 (rustc-dev-guide subtree update)
 - #158776 (fix: emit diagnostic for AVR target without target-cpu)
 - #158786 (Add regression test for builtin attr macro values)
 - #158807 (Add regression test for CString::clone_into unwind safety)
 - #158825 (Fix typo)

jhpratt mentioned this pull request

Rollup of 24 pull requests #158847

Merged

rust-bors Bot pushed a commit that referenced this pull request


          Auto merge of #158847 - jhpratt:rollup-MkjhKjV, r=jhpratt

29d802f

Rollup of 24 pull requests

Successful merges:

 - #158377 (add `-Zforce-intrinsic-fallback` flag)
 - #158642 (Clarify some interning details)
 - #158694 (Positive test for closures needing expectations)
 - #158743 (Look for cdb location in the registry first)
 - #158775 (bootstrap: only encode RUSTFLAGS when a flag contains a space)
 - #158782 (Add and use cfg(target_has_threads) to enforce no_thread impl usage)
 - #158785 (hook intrinsic-test into aarch64-gnu)
 - #158819 (Put `InhabitedPredicate::NotInModule` earlier in disjunction since it can be a lot faster)
 - #157734 (Stabilize `local_key_cell_update`)
 - #158183 (std: allocate less memory in `current_exe` for OpenBSD)
 - #158310 (Remove unexpected usage of Unambig in non-infer variants)
 - #158671 (Move tests batch 17)
 - #158730 (Update `FIXME(static_mut_refs)` comments)
 - #158752 (Reorganize `tests/ui/issues` [18/N])
 - #158755 (Use `ThinVec` more in the AST)
 - #158757 (Fix incorrect tracking issue for `read_le`/`read_be`)
 - #158765 (Fix ICE on non-ident path in `doc(auto_cfg values)`)
 - #158771 (library: expand HashSet::extract_if coverage)
 - #158772 (rustc-dev-guide subtree update)
 - #158776 (fix: emit diagnostic for AVR target without target-cpu)
 - #158786 (Add regression test for builtin attr macro values)
 - #158810 (Add supplementary information for get_unchecked(mut))
 - #158825 (Fix typo)
 - #158838 (tidy: Use `empty_alternate = true` for triagebot mention glob check)

rust-bors Bot pushed a commit that referenced this pull request


          Auto merge of #158847 - jhpratt:rollup-MkjhKjV, r=jhpratt

315eb8b

Rollup of 24 pull requests

Successful merges:

 - #158377 (add `-Zforce-intrinsic-fallback` flag)
 - #158642 (Clarify some interning details)
 - #158694 (Positive test for closures needing expectations)
 - #158743 (Look for cdb location in the registry first)
 - #158775 (bootstrap: only encode RUSTFLAGS when a flag contains a space)
 - #158782 (Add and use cfg(target_has_threads) to enforce no_thread impl usage)
 - #158785 (hook intrinsic-test into aarch64-gnu)
 - #158819 (Put `InhabitedPredicate::NotInModule` earlier in disjunction since it can be a lot faster)
 - #157734 (Stabilize `local_key_cell_update`)
 - #158183 (std: allocate less memory in `current_exe` for OpenBSD)
 - #158310 (Remove unexpected usage of Unambig in non-infer variants)
 - #158671 (Move tests batch 17)
 - #158730 (Update `FIXME(static_mut_refs)` comments)
 - #158752 (Reorganize `tests/ui/issues` [18/N])
 - #158755 (Use `ThinVec` more in the AST)
 - #158757 (Fix incorrect tracking issue for `read_le`/`read_be`)
 - #158765 (Fix ICE on non-ident path in `doc(auto_cfg values)`)
 - #158771 (library: expand HashSet::extract_if coverage)
 - #158772 (rustc-dev-guide subtree update)
 - #158776 (fix: emit diagnostic for AVR target without target-cpu)
 - #158786 (Add regression test for builtin attr macro values)
 - #158810 (Add supplementary information for get_unchecked(mut))
 - #158825 (Fix typo)
 - #158838 (tidy: Use `empty_alternate = true` for triagebot mention glob check)

rust-bors Bot pushed a commit that referenced this pull request


          Auto merge of #158847 - jhpratt:rollup-MkjhKjV, r=jhpratt

c4af710

Rollup of 24 pull requests

Successful merges:

 - #158377 (add `-Zforce-intrinsic-fallback` flag)
 - #158642 (Clarify some interning details)
 - #158694 (Positive test for closures needing expectations)
 - #158743 (Look for cdb location in the registry first)
 - #158775 (bootstrap: only encode RUSTFLAGS when a flag contains a space)
 - #158782 (Add and use cfg(target_has_threads) to enforce no_thread impl usage)
 - #158785 (hook intrinsic-test into aarch64-gnu)
 - #158819 (Put `InhabitedPredicate::NotInModule` earlier in disjunction since it can be a lot faster)
 - #157734 (Stabilize `local_key_cell_update`)
 - #158183 (std: allocate less memory in `current_exe` for OpenBSD)
 - #158310 (Remove unexpected usage of Unambig in non-infer variants)
 - #158671 (Move tests batch 17)
 - #158730 (Update `FIXME(static_mut_refs)` comments)
 - #158752 (Reorganize `tests/ui/issues` [18/N])
 - #158755 (Use `ThinVec` more in the AST)
 - #158757 (Fix incorrect tracking issue for `read_le`/`read_be`)
 - #158765 (Fix ICE on non-ident path in `doc(auto_cfg values)`)
 - #158771 (library: expand HashSet::extract_if coverage)
 - #158772 (rustc-dev-guide subtree update)
 - #158776 (fix: emit diagnostic for AVR target without target-cpu)
 - #158786 (Add regression test for builtin attr macro values)
 - #158810 (Add supplementary information for get_unchecked(mut))
 - #158825 (Fix typo)
 - #158838 (tidy: Use `empty_alternate = true` for triagebot mention glob check)

rust-bors Bot merged commit eadd942 into rust-lang:main

14 checks passed

rustbot added this to the 1.99.0 milestone

rust-timer added a commit that referenced this pull request


          Unrolled build for #158755

8646ca4

Rollup merge of #158755 - nnethercote:ast-ThinVec, r=mejrs

Use `ThinVec` more in the AST

For consistency; it has negligible effects on perf. Details in individual commits.

r? @mejrs

nnethercote deleted the ast-ThinVec branch

July 6, 2026 23:08

pull Bot pushed a commit to xtqqczze/rust-lang-miri that referenced this pull request


          Auto merge of #158847 - jhpratt:rollup-MkjhKjV, r=jhpratt

a2587f8

Rollup of 24 pull requests

Successful merges:

 - rust-lang/rust#158377 (add `-Zforce-intrinsic-fallback` flag)
 - rust-lang/rust#158642 (Clarify some interning details)
 - rust-lang/rust#158694 (Positive test for closures needing expectations)
 - rust-lang/rust#158743 (Look for cdb location in the registry first)
 - rust-lang/rust#158775 (bootstrap: only encode RUSTFLAGS when a flag contains a space)
 - rust-lang/rust#158782 (Add and use cfg(target_has_threads) to enforce no_thread impl usage)
 - rust-lang/rust#158785 (hook intrinsic-test into aarch64-gnu)
 - rust-lang/rust#158819 (Put `InhabitedPredicate::NotInModule` earlier in disjunction since it can be a lot faster)
 - rust-lang/rust#157734 (Stabilize `local_key_cell_update`)
 - rust-lang/rust#158183 (std: allocate less memory in `current_exe` for OpenBSD)
 - rust-lang/rust#158310 (Remove unexpected usage of Unambig in non-infer variants)
 - rust-lang/rust#158671 (Move tests batch 17)
 - rust-lang/rust#158730 (Update `FIXME(static_mut_refs)` comments)
 - rust-lang/rust#158752 (Reorganize `tests/ui/issues` [18/N])
 - rust-lang/rust#158755 (Use `ThinVec` more in the AST)
 - rust-lang/rust#158757 (Fix incorrect tracking issue for `read_le`/`read_be`)
 - rust-lang/rust#158765 (Fix ICE on non-ident path in `doc(auto_cfg values)`)
 - rust-lang/rust#158771 (library: expand HashSet::extract_if coverage)
 - rust-lang/rust#158772 (rustc-dev-guide subtree update)
 - rust-lang/rust#158776 (fix: emit diagnostic for AVR target without target-cpu)
 - rust-lang/rust#158786 (Add regression test for builtin attr macro values)
 - rust-lang/rust#158810 (Add supplementary information for get_unchecked(mut))
 - rust-lang/rust#158825 (Fix typo)
 - rust-lang/rust#158838 (tidy: Use `empty_alternate = true` for triagebot mention glob check)

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