Arg splat experiment - hir FnDecl impl by teor2345 · Pull Request #157699 · rust-lang/rust

teor2345 · 2026-06-10T10:17:44Z

This PR is part of the argument splatting lang experiment, and FFI overloading / C++ interop project goals:

I've split it from #153697 to make reviewing easier, see that PR for more details.

The PR is the HIR-level implementation of the feature, excluding typecheck:

Add splat to HIR FnDecl
refactor param_count so it returns a struct, and rename to param_info

Once this PR merges, I'll rebase #153697.

There aren't any extra tests in this PR, because it doesn't have much externally visible functionality. The visible functionality and tests are in the rest of #153697.

rustbot · 2026-06-10T10:17:48Z

HIR ty lowering was modified

cc @fmease

rustbot · 2026-06-10T10:17:50Z

r? @oli-obk

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oli-obk

@bors r+ rollup

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rust-bors · 2026-06-10T11:29:39Z

📌 Commit 746fc13 has been approved by oli-obk

It is now in the queue for this repository.

🌲 The tree is currently closed for pull requests below priority 5. This pull request will be tested once the tree is reopened.

…uwer Rollup of 14 pull requests Successful merges: - #157280 (traits: Allow escaping self types in ExistentialTraitRef::with_self_ty) - #157282 (Fix post-monomorphization error note race in the parallel frontend) - #157352 (Make the retained dep graph deterministic under the parallel frontend) - #157601 (Emit error for unused target expression in glob and list delegations) - #157626 (Autogenerate unstable compiler flag stubs for unstable-book) - #157647 (Start using comptime for reflection intrinsics and their wrapper functions) - #157013 (Ensure inferred let pattern types are well-formed) - #157288 (platform support: add SNaN erratum to MIPS targets) - #157355 (Add `or_try_*` variants for `HashMap` and `BTreeMap` Entry APIs) - #157577 (Fix parser error recovery treating 'dyn' as a strict keyword in Rust …) - #157670 (Rename `errors.rs` file to `diagnostics.rs` (4/N)) - #157691 (Move symbol hiding code to a new file) - #157700 (Rename `errors.rs` file to `diagnostics.rs` (5/N)) - #157703 (Fix doc link to Instant sub in saturating caveat) Failed merges: - #157699 (Arg splat experiment - hir FnDecl impl)

Rollup of 23 pull requests Successful merges: - #157280 (traits: Allow escaping self types in ExistentialTraitRef::with_self_ty) - #157282 (Fix post-monomorphization error note race in the parallel frontend) - #157352 (Make the retained dep graph deterministic under the parallel frontend) - #157601 (Emit error for unused target expression in glob and list delegations) - #157611 (Update `browser-ui-test` version to `0.24.0`) - #157620 (Add a strategy FnMut to inject behavior into the flush cycle) - #157645 (Windows TLS - Only register the `atexit` hook when `cleanup` can be unloaded) - #157647 (Start using comptime for reflection intrinsics and their wrapper functions) - #157719 (resolve: Partially revert "Remove a special case for dummy imports") - #156497 (fix-155516: Don't suggest wrong unwrap expect) - #156583 (Support defaults for static EIIs) - #157013 (Ensure inferred let pattern types are well-formed) - #157230 (borrowck: avoid ICE describing fields on generic params) - #157288 (platform support: add SNaN erratum to MIPS targets) - #157350 (compiletest: ignore SVG `y` offset in by-lines comparison) - #157355 (Add `or_try_*` variants for `HashMap` and `BTreeMap` Entry APIs) - #157384 (Add `#[rustc_dump_generics]` attribute) - #157577 (Fix parser error recovery treating 'dyn' as a strict keyword in Rust 2015 when used in `dyn + dyn`) - #157670 (Rename `errors.rs` file to `diagnostics.rs` (4/N)) - #157691 (Move symbol hiding code to a new file) - #157697 (Add more tests that exercise the well-formedness checking of lazy type aliases) - #157700 (Rename `errors.rs` file to `diagnostics.rs` (5/N)) - #157703 (Fix doc link to Instant sub in saturating caveat) Failed merges: - #157699 (Arg splat experiment - hir FnDecl impl)

Rollup of 31 pull requests Successful merges: - #141030 (Expand free alias types during variance computation) - #154853 (mgca: Register `ConstArgHasType` when normalizing projection consts) - #155527 (Replace printables table with `unicode_data.rs` tables) - #156629 (Stabilize `core::range::{legacy, RangeFull, RangeTo}`) - #157280 (traits: Allow escaping self types in ExistentialTraitRef::with_self_ty) - #157282 (Fix post-monomorphization error note race in the parallel frontend) - #157352 (Make the retained dep graph deterministic under the parallel frontend) - #157601 (Emit error for unused target expression in glob and list delegations) - #157611 (Update `browser-ui-test` version to `0.24.0`) - #157620 (Add a strategy FnMut to inject behavior into the flush cycle) - #157645 (Windows TLS - Only register the `atexit` hook when `cleanup` can be unloaded) - #157646 (Keep rename-imported main alive in dead-code analysis under `--test`) - #157647 (Start using comptime for reflection intrinsics and their wrapper functions) - #157719 (resolve: Partially revert "Remove a special case for dummy imports") - #155153 (Ensure Send/Sync is not implemented for std::env::Vars{,Os}) - #155198 (fix(mgca): Allow specifying generic args (of enum) on enum itself in unit & tuple variant constructions in (direct) const args) - #155323 (refactor `TypeRelativePath::AssocItem` to use `AliasTerm`) - #156497 (fix-155516: Don't suggest wrong unwrap expect) - #156583 (Support defaults for static EIIs) - #157013 (Ensure inferred let pattern types are well-formed) - #157196 (Only suggest reborrowing a moved value where the reborrow is valid) - #157230 (borrowck: avoid ICE describing fields on generic params) - #157288 (platform support: add SNaN erratum to MIPS targets) - #157330 (remove `IsTypeConst` from `hir::TraitItemKind`) - #157350 (compiletest: ignore SVG `y` offset in by-lines comparison) - #157355 (Add `or_try_*` variants for `HashMap` and `BTreeMap` Entry APIs) - #157577 (Fix parser error recovery treating 'dyn' as a strict keyword in Rust 2015 when used in `dyn + dyn`) - #157670 (Rename `errors.rs` file to `diagnostics.rs` (4/N)) - #157691 (Move symbol hiding code to a new file) - #157700 (Rename `errors.rs` file to `diagnostics.rs` (5/N)) - #157703 (Fix doc link to Instant sub in saturating caveat) Failed merges: - #157699 (Arg splat experiment - hir FnDecl impl)

rustbot · 2026-06-11T11:36:06Z

This PR was rebased onto a different main commit. Here's a range-diff highlighting what actually changed.

Rebasing is a normal part of keeping PRs up to date, so no action is needed—this note is just to help reviewers.

teor2345 · 2026-06-11T11:38:51Z

Just a minor rebase conflict in the param_info refactor

@rustbot reviewer

Rollup of 31 pull requests Successful merges: - rust-lang#141030 (Expand free alias types during variance computation) - rust-lang#154853 (mgca: Register `ConstArgHasType` when normalizing projection consts) - rust-lang#155527 (Replace printables table with `unicode_data.rs` tables) - rust-lang#156629 (Stabilize `core::range::{legacy, RangeFull, RangeTo}`) - rust-lang#157280 (traits: Allow escaping self types in ExistentialTraitRef::with_self_ty) - rust-lang#157282 (Fix post-monomorphization error note race in the parallel frontend) - rust-lang#157352 (Make the retained dep graph deterministic under the parallel frontend) - rust-lang#157601 (Emit error for unused target expression in glob and list delegations) - rust-lang#157611 (Update `browser-ui-test` version to `0.24.0`) - rust-lang#157620 (Add a strategy FnMut to inject behavior into the flush cycle) - rust-lang#157645 (Windows TLS - Only register the `atexit` hook when `cleanup` can be unloaded) - rust-lang#157646 (Keep rename-imported main alive in dead-code analysis under `--test`) - rust-lang#157647 (Start using comptime for reflection intrinsics and their wrapper functions) - rust-lang#157719 (resolve: Partially revert "Remove a special case for dummy imports") - rust-lang#155153 (Ensure Send/Sync is not implemented for std::env::Vars{,Os}) - rust-lang#155198 (fix(mgca): Allow specifying generic args (of enum) on enum itself in unit & tuple variant constructions in (direct) const args) - rust-lang#155323 (refactor `TypeRelativePath::AssocItem` to use `AliasTerm`) - rust-lang#156497 (fix-155516: Don't suggest wrong unwrap expect) - rust-lang#156583 (Support defaults for static EIIs) - rust-lang#157013 (Ensure inferred let pattern types are well-formed) - rust-lang#157196 (Only suggest reborrowing a moved value where the reborrow is valid) - rust-lang#157230 (borrowck: avoid ICE describing fields on generic params) - rust-lang#157288 (platform support: add SNaN erratum to MIPS targets) - rust-lang#157330 (remove `IsTypeConst` from `hir::TraitItemKind`) - rust-lang#157350 (compiletest: ignore SVG `y` offset in by-lines comparison) - rust-lang#157355 (Add `or_try_*` variants for `HashMap` and `BTreeMap` Entry APIs) - rust-lang#157577 (Fix parser error recovery treating 'dyn' as a strict keyword in Rust 2015 when used in `dyn + dyn`) - rust-lang#157670 (Rename `errors.rs` file to `diagnostics.rs` (4/N)) - rust-lang#157691 (Move symbol hiding code to a new file) - rust-lang#157700 (Rename `errors.rs` file to `diagnostics.rs` (5/N)) - rust-lang#157703 (Fix doc link to Instant sub in saturating caveat) Failed merges: - rust-lang#157699 (Arg splat experiment - hir FnDecl impl)

JonathanBrouwer · 2026-06-11T16:43:15Z

@bors r=oli-obk

rust-bors · 2026-06-11T16:43:19Z

📌 Commit d248472 has been approved by oli-obk

It is now in the queue for this repository.

…r=oli-obk Arg splat experiment - hir FnDecl impl This PR is part of the argument splatting lang experiment, and FFI overloading / C++ interop project goals: - rust-lang#153629 - https://rust-lang.github.io/rust-project-goals/2026/overloading-for-ffi.html - https://rust-lang.github.io/rust-project-goals/2025h2/interop-problem-map.html I've split it from rust-lang#153697 to make reviewing easier, see that PR for more details. The PR is the HIR-level implementation of the feature, excluding typecheck: - Add splat to HIR FnDecl - refactor `param_count` so it returns a struct, and rename to `param_info` Once this PR merges, I'll rebase rust-lang#153697. There aren't any extra tests in this PR, because it doesn't have much externally visible functionality. The visible functionality and tests are in the rest of rust-lang#153697.

…uwer Rollup of 23 pull requests Successful merges: - #157716 (update Enzyme, June'26) - #149793 (Add inline asm support for amdgpu) - #152852 (Remove driver_lint_caps) - #155299 (make repr_transparent_non_zst_fields a hard error) - #155439 (Enable Cargo's new build-dir layout) - #157612 (Add a test where subtyping inhibits coercion.) - #157626 (Autogenerate unstable compiler flag stubs for unstable-book) - #157667 (Rename typing modes to better describe real usage) - #156212 (Additionally gate negative bounds behind new `-Zinternal-testing-features`) - #157342 (Reduce verbosity of cycle errors when possible) - #157366 (Add a regression test for an unconstrained TransmuteFrom ICE) - #157459 (rustc_target: callconv: powerpc64: Remove unreachable fallback code path) - #157658 (UnsafeCell: mention shared-ref-to-interior case, fix aliasing model inaccuracy) - #157698 (Remove an unnecessary cloning) - #157699 (Arg splat experiment - hir FnDecl impl) - #157713 (resolve: Remove exported imports from `maybe_unused_trait_imports`) - #157722 (Move create_scope_map to rustc_codegen_ssa.) - #157725 (Keep generic suggestion for macro-expanded missing-type items) - #157733 (Remove old FIXMEs about nocapture attribute) - #157737 (Reorganize `tests/ui/issues` [7/N]) - #157746 (supports_c_variadic_definitions: extend checklist for new targets) - #157763 (Move unused target expression error to appropriate place and rename it) - #157768 (codegen_ssa: peel trans. wrappers on scalable vecs)

…r=oli-obk Arg splat experiment - hir FnDecl impl This PR is part of the argument splatting lang experiment, and FFI overloading / C++ interop project goals: - rust-lang#153629 - https://rust-lang.github.io/rust-project-goals/2026/overloading-for-ffi.html - https://rust-lang.github.io/rust-project-goals/2025h2/interop-problem-map.html I've split it from rust-lang#153697 to make reviewing easier, see that PR for more details. The PR is the HIR-level implementation of the feature, excluding typecheck: - Add splat to HIR FnDecl - refactor `param_count` so it returns a struct, and rename to `param_info` Once this PR merges, I'll rebase rust-lang#153697. There aren't any extra tests in this PR, because it doesn't have much externally visible functionality. The visible functionality and tests are in the rest of rust-lang#153697.

…uwer Rollup of 23 pull requests Successful merges: - #157716 (update Enzyme, June'26) - #149793 (Add inline asm support for amdgpu) - #155299 (make repr_transparent_non_zst_fields a hard error) - #155439 (Enable Cargo's new build-dir layout) - #157612 (Add a test where subtyping inhibits coercion.) - #157626 (Autogenerate unstable compiler flag stubs for unstable-book) - #157667 (Rename typing modes to better describe real usage) - #149749 (Make `BorrowedBuf` and `BorrowedCursor` generic over the data) - #156212 (Additionally gate negative bounds behind new `-Zinternal-testing-features`) - #157342 (Reduce verbosity of cycle errors when possible) - #157366 (Add a regression test for an unconstrained TransmuteFrom ICE) - #157459 (rustc_target: callconv: powerpc64: Remove unreachable fallback code path) - #157658 (UnsafeCell: mention shared-ref-to-interior case, fix aliasing model inaccuracy) - #157698 (Remove an unnecessary cloning) - #157699 (Arg splat experiment - hir FnDecl impl) - #157713 (resolve: Remove exported imports from `maybe_unused_trait_imports`) - #157722 (Move create_scope_map to rustc_codegen_ssa.) - #157725 (Keep generic suggestion for macro-expanded missing-type items) - #157733 (Remove old FIXMEs about nocapture attribute) - #157737 (Reorganize `tests/ui/issues` [7/N]) - #157746 (supports_c_variadic_definitions: extend checklist for new targets) - #157763 (Move unused target expression error to appropriate place and rename it) - #157768 (codegen_ssa: peel trans. wrappers on scalable vecs)

Rollup of 24 pull requests Successful merges: - #157716 (update Enzyme, June'26) - #149793 (Add inline asm support for amdgpu) - #155299 (make repr_transparent_non_zst_fields a hard error) - #157612 (Add a test where subtyping inhibits coercion.) - #157626 (Autogenerate unstable compiler flag stubs for unstable-book) - #157667 (Rename typing modes to better describe real usage) - #149749 (Make `BorrowedBuf` and `BorrowedCursor` generic over the data) - #155113 (Ensure Send/Sync impl for std::process::CommandArgs) - #156212 (Additionally gate negative bounds behind new `-Zinternal-testing-features`) - #157342 (Reduce verbosity of cycle errors when possible) - #157366 (Add a regression test for an unconstrained TransmuteFrom ICE) - #157459 (rustc_target: callconv: powerpc64: Remove unreachable fallback code path) - #157658 (UnsafeCell: mention shared-ref-to-interior case, fix aliasing model inaccuracy) - #157698 (Remove an unnecessary cloning) - #157699 (Arg splat experiment - hir FnDecl impl) - #157713 (resolve: Remove exported imports from `maybe_unused_trait_imports`) - #157722 (Move create_scope_map to rustc_codegen_ssa.) - #157723 (Move uninhabited unreachable code lint to rustc_mir_transform) - #157725 (Keep generic suggestion for macro-expanded missing-type items) - #157733 (Remove old FIXMEs about nocapture attribute) - #157737 (Reorganize `tests/ui/issues` [7/N]) - #157746 (supports_c_variadic_definitions: extend checklist for new targets) - #157763 (Move unused target expression error to appropriate place and rename it) - #157768 (codegen_ssa: peel trans. wrappers on scalable vecs)

Rollup merge of #157699 - teor2345:fn-arg-splat-exp-hir-fn, r=oli-obk Arg splat experiment - hir FnDecl impl This PR is part of the argument splatting lang experiment, and FFI overloading / C++ interop project goals: - #153629 - https://rust-lang.github.io/rust-project-goals/2026/overloading-for-ffi.html - https://rust-lang.github.io/rust-project-goals/2025h2/interop-problem-map.html I've split it from #153697 to make reviewing easier, see that PR for more details. The PR is the HIR-level implementation of the feature, excluding typecheck: - Add splat to HIR FnDecl - refactor `param_count` so it returns a struct, and rename to `param_info` Once this PR merges, I'll rebase #153697. There aren't any extra tests in this PR, because it doesn't have much externally visible functionality. The visible functionality and tests are in the rest of #153697.

Rollup of 24 pull requests Successful merges: - rust-lang/rust#157716 (update Enzyme, June'26) - rust-lang/rust#149793 (Add inline asm support for amdgpu) - rust-lang/rust#155299 (make repr_transparent_non_zst_fields a hard error) - rust-lang/rust#157612 (Add a test where subtyping inhibits coercion.) - rust-lang/rust#157626 (Autogenerate unstable compiler flag stubs for unstable-book) - rust-lang/rust#157667 (Rename typing modes to better describe real usage) - rust-lang/rust#149749 (Make `BorrowedBuf` and `BorrowedCursor` generic over the data) - rust-lang/rust#155113 (Ensure Send/Sync impl for std::process::CommandArgs) - rust-lang/rust#156212 (Additionally gate negative bounds behind new `-Zinternal-testing-features`) - rust-lang/rust#157342 (Reduce verbosity of cycle errors when possible) - rust-lang/rust#157366 (Add a regression test for an unconstrained TransmuteFrom ICE) - rust-lang/rust#157459 (rustc_target: callconv: powerpc64: Remove unreachable fallback code path) - rust-lang/rust#157658 (UnsafeCell: mention shared-ref-to-interior case, fix aliasing model inaccuracy) - rust-lang/rust#157698 (Remove an unnecessary cloning) - rust-lang/rust#157699 (Arg splat experiment - hir FnDecl impl) - rust-lang/rust#157713 (resolve: Remove exported imports from `maybe_unused_trait_imports`) - rust-lang/rust#157722 (Move create_scope_map to rustc_codegen_ssa.) - rust-lang/rust#157723 (Move uninhabited unreachable code lint to rustc_mir_transform) - rust-lang/rust#157725 (Keep generic suggestion for macro-expanded missing-type items) - rust-lang/rust#157733 (Remove old FIXMEs about nocapture attribute) - rust-lang/rust#157737 (Reorganize `tests/ui/issues` [7/N]) - rust-lang/rust#157746 (supports_c_variadic_definitions: extend checklist for new targets) - rust-lang/rust#157763 (Move unused target expression error to appropriate place and rename it) - rust-lang/rust#157768 (codegen_ssa: peel trans. wrappers on scalable vecs)

panstromek · 2026-06-16T06:47:36Z

@rust-timer build e646012

rust-timer · 2026-06-16T07:28:12Z

Finished benchmarking commit (e646012): comparison URL.

Overall result: ❌✅ regressions and improvements - 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

Our most reliable metric. Used to determine the overall result above. However, even this metric can be noisy.

	mean	range	count
Regressions ❌ (primary)	0.6%	[0.6%, 0.6%]	1
Regressions ❌ (secondary)	0.2%	[0.2%, 0.2%]	1
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-0.2%	[-0.2%, -0.2%]	2
All ❌✅ (primary)	0.6%	[0.6%, 0.6%]	1

Max RSS (memory usage)

Results (primary -5.3%, secondary -0.3%)

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

	mean	range	count
Regressions ❌ (primary)	-	-	0
Regressions ❌ (secondary)	2.3%	[2.3%, 2.3%]	1
Improvements ✅ (primary)	-5.3%	[-5.3%, -5.3%]	1
Improvements ✅ (secondary)	-3.0%	[-3.0%, -3.0%]	1
All ❌✅ (primary)	-5.3%	[-5.3%, -5.3%]	1

Cycles

Results (secondary -2.4%)

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

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

Binary size

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

Bootstrap: 518.98s -> 523.419s (0.86%)
Artifact size: 400.92 MiB -> 400.87 MiB (-0.01%)

teor2345 · 2026-06-16T08:03:21Z

Significant regressions in unicode-normalization and include-blob, I'll rebase and split #155852 to address them.

panstromek · 2026-06-16T08:38:38Z

@TeoR Note that this is not that bad. If you look into it, then that's of course appreciated, but we often accept similarly sized regressions for imporant work. It can be really difficult to mitigate them if they are this small and you need to "squeeze in" your work into it somehow (the regressed ones are incr-unchanged scenarios, those are super tiny, usually dominated by metadata related code or similar). If you don't find a simple way to address that, you probably don't need to stress about it very much.

Also, keep in mind that include-blob is bimodal, and generally somewhat weird, so it's possible that that result is just spurious, too.

rustbot added 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. labels Jun 10, 2026

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teor2345 mentioned this pull request Jun 10, 2026

Add arg splat experiment initial tuple impl #153697

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Comment thread compiler/rustc_ast_passes/src/diagnostics.rs

oli-obk approved these changes Jun 10, 2026

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teor2345 mentioned this pull request Jun 10, 2026

Tracking Issue for argument splatting lang experiment #153629

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Rollup of 14 pull requests #157708

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Rollup of 17 pull requests #157720

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Rollup of 23 pull requests #157726

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Rollup of 28 pull requests #157735

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Rollup of 31 pull requests #157739

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teor2345 added 2 commits June 11, 2026 13:34

Add HIR FnDecl for #[splat]

4abb0aa

Make the param_info return type into a struct, and rename the function

d248472

teor2345 force-pushed the fn-arg-splat-exp-hir-fn branch from 746fc13 to d248472 Compare June 11, 2026 11:36

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Rollup of 23 pull requests #157784

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Rollup of 23 pull requests #157790

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jhpratt mentioned this pull request Jun 12, 2026

Rollup of 24 pull requests #157794

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rust-bors Bot merged commit 3bfde28 into rust-lang:main Jun 12, 2026
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teor2345 mentioned this pull request Jun 16, 2026

perf: Store 1 bit for splatting in FnDeclFlags #157954

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teor2345 mentioned this pull request Jun 16, 2026

perf: Inline some hot functions in FnDecl #157955

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rust-timer commented Jun 16, 2026

Overall result: ❌✅ regressions and improvements - no action needed

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