Lint against iterator functions that panic when `N` is zero - #153563

Urgau · 2026-03-08T12:14:42Z

This PR extends the deny-by-default unconditional_panic lint, by linting on iterator functions that panics when N (chunks/windows size) is zero¹.

Those methods are documented to panic if N is zero.

error: this operation will panic at runtime
  --> $DIR/const-n-is-zero.rs:11:13
   |
LL |     let _ = s.array_windows::<0>();
   |             ^^^^^^^^^^^^^^^^^^^^^^ const parameter `N` is zero
   |
   = note: `#[deny(unconditional_panic)]` on by default

cc @rust-lang/libs-api

this is done by introducing a new internal attribute on the const parameter: #[rustc_panics_when_zero] ↩

rustbot · 2026-03-08T12:14:45Z

Some changes occurred in compiler/rustc_hir/src/attrs

cc @jdonszelmann, @JonathanBrouwer

This PR changes MIR

cc @oli-obk, @RalfJung, @JakobDegen, @vakaras

Some changes occurred in compiler/rustc_passes/src/check_attr.rs

cc @jdonszelmann, @JonathanBrouwer

This PR changes rustc_public

cc @oli-obk, @celinval, @ouz-a, @makai410

Some changes occurred to the CTFE machinery

cc @RalfJung, @oli-obk, @lcnr

Some changes occurred to MIR optimizations

cc @rust-lang/wg-mir-opt

Some changes occurred in compiler/rustc_attr_parsing

cc @jdonszelmann, @JonathanBrouwer

rustbot · 2026-03-08T12:14:47Z

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RalfJung · 2026-03-08T12:32:40Z

This PR adds new kind of variant to the deny-by-default unconditional_panic lint, by linting on iterator functions that panics when N (chunks/windows size) is zero.

This seems to do much more than that. It adds a new language primitive, a new kind of built-in assertion. Could you motivate that?

Urgau · 2026-03-08T12:41:08Z

This seems to do much more than that. It adds a new language primitive, a new kind of built-in assertion. Could you motivate that?

The code is unfortunately tangled, it doesn't add a new language primitive per se, but report_assert_as_lint requires a AssertKind variant even if it's just for linting in one place.

I could probably modify that function so it doesn't take an AssertKind, but I wasn't sure about that.

RalfJung · 2026-03-08T12:43:44Z

Given that AssertKind is part of the MIR syntax, I feel very strongly that we shouldn't modify it for non-MIR/opsem purposes.

Urgau · 2026-03-08T13:23:56Z

Understandable, I've reworked the PR to avoid touching at AssertKind.

JohnTitor

I love the idea but it should better for someone more familiar with this topic other than me to review. @RalfJung Could you take over? Otherwise I'd reroll.

View changes since this review

RalfJung · 2026-03-09T10:51:27Z

I'm afraid not, I don't have capacity at the moment.

@rustbot reroll

fee1-dead

I think the overall idea is good and I could see myself approving down the line, however I think we should see if we can have an attribute on the generic parameter itself instead of applying rustc_panics_when_n_is_zero to the enclosing function. If not, I'd still want something more verbose, such as #[rustc_panics_when_const_param_is_zero(N)]

I don't think this should be touching AssertLint. I feel like it might be simpler to just add a separate error for this rather than using existing mechanisms.

View changes since this review

Urgau · 2026-03-29T20:43:25Z

I had to add the encoding of const-params in rmeta, but otherwise I've moved the attribute directly to the const generic.

I've also removed any interaction with AssertLint, but kept the reporting behind the unconditional_panic lint.

@rustbot ready

fee1-dead · 2026-04-06T00:03:19Z

overall looks good, would like someone else to sign off with me on this together though

@rustbot reroll

…r=fee1-dead,ShoyuVanilla Lint against iterator functions that panic when `N` is zero This PR extends the deny-by-default `unconditional_panic` lint, by linting on iterator functions that panics when `N` (chunks/windows size) is zero[^attr]. Those methods are [documented](https://doc.rust-lang.org/std/primitive.slice.html#panics-11) to panic if `N` is zero. ``` error: this operation will panic at runtime --> $DIR/const-n-is-zero.rs:11:13 | LL | let _ = s.array_windows::<0>(); | ^^^^^^^^^^^^^^^^^^^^^^ const parameter `N` is zero | = note: `#[deny(unconditional_panic)]` on by default ``` cc @rust-lang/libs-api [^attr]: this is done by introducing a new internal attribute on the const parameter: `#[rustc_panics_when_zero]`

JonathanBrouwer · 2026-07-27T09:57:20Z

💔 I suspect this PR failed tests as part of a rollup
@bors r-

After fixing the problem, consider running a try job for the failed job before re-approving.

Link to failure: https://github.com/rust-lang/rust/actions/runs/30255157007/job/89942047433?pr=160002

rust-bors · 2026-07-27T09:57:29Z

This pull request was unapproved.

This PR was contained in a rollup (#160002), which was unapproved.

View changes since this unapproval

rustbot · 2026-07-27T20:48:43Z

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.

ShoyuVanilla · 2026-07-28T02:44:49Z

@bors r=fee1-dead,ShoyuVanilla

rust-bors · 2026-07-28T02:44:51Z

📌 Commit 24e4698 has been approved by fee1-dead,ShoyuVanilla

It is now in the queue for this repository.

🌲 The tree is currently closed for pull requests below priority 100. This pull request will be tested once the tree is reopened.

Reason for tree closure: spurious failures

Rollup of 9 pull requests Successful merges: - #153563 (Lint against iterator functions that panic when `N` is zero ) - #159960 (Allow `UnsafeCell` content access without `get` in `invalid_reference_casting` lint) - #158893 (Clarify preconditions of raw size/align methods) - #159220 (Don't optimize across storage markers in SimplifyComparisonIntegral) - #159309 (Move tests batch 18) - #159450 (Add codegen test for enum clone) - #160017 (Make BorrowSet methods public again) - #160022 (Refactor rustc_hir re-exports) - #160041 (Correct tracking issue for `casefold` feature)

Rollup merge of #153563 - Urgau:lint-panics-when-n-is-zero, r=fee1-dead,ShoyuVanilla Lint against iterator functions that panic when `N` is zero This PR extends the deny-by-default `unconditional_panic` lint, by linting on iterator functions that panics when `N` (chunks/windows size) is zero[^attr]. Those methods are [documented](https://doc.rust-lang.org/std/primitive.slice.html#panics-11) to panic if `N` is zero. ``` error: this operation will panic at runtime --> $DIR/const-n-is-zero.rs:11:13 | LL | let _ = s.array_windows::<0>(); | ^^^^^^^^^^^^^^^^^^^^^^ const parameter `N` is zero | = note: `#[deny(unconditional_panic)]` on by default ``` cc @rust-lang/libs-api [^attr]: this is done by introducing a new internal attribute on the const parameter: `#[rustc_panics_when_zero]`

jhpratt · 2026-07-29T07:46:09Z

@rust-timer build 4020bb0

rust-timer · 2026-07-29T08:26:19Z

Finished benchmarking commit (4020bb0): 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
Regressions ❌ (secondary)	0.1%	[0.1%, 0.1%]	2
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-0.1%	[-0.1%, -0.1%]	1
All ❌✅ (primary)	-	-	0

Max RSS (memory usage)

Results (primary -9.3%, secondary 0.2%)

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)	3.8%	[2.1%, 5.5%]	2
Improvements ✅ (primary)	-9.3%	[-9.3%, -9.3%]	1
Improvements ✅ (secondary)	-2.3%	[-4.2%, -0.6%]	3
All ❌✅ (primary)	-9.3%	[-9.3%, -9.3%]	1

Cycles

Results (primary -2.5%, secondary 5.9%)

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)	14.6%	[2.2%, 39.3%]	6
Improvements ✅ (primary)	-2.5%	[-2.5%, -2.5%]	1
Improvements ✅ (secondary)	-4.5%	[-6.3%, -2.7%]	5
All ❌✅ (primary)	-2.5%	[-2.5%, -2.5%]	1

Binary size

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

Bootstrap: 487.856s -> 488.493s (0.13%)
Artifact size: 388.05 MiB -> 390.08 MiB (0.52%)

Rollup of 9 pull requests Successful merges: - rust-lang/rust#153563 (Lint against iterator functions that panic when `N` is zero ) - rust-lang/rust#159960 (Allow `UnsafeCell` content access without `get` in `invalid_reference_casting` lint) - rust-lang/rust#158893 (Clarify preconditions of raw size/align methods) - rust-lang/rust#159220 (Don't optimize across storage markers in SimplifyComparisonIntegral) - rust-lang/rust#159309 (Move tests batch 18) - rust-lang/rust#159450 (Add codegen test for enum clone) - rust-lang/rust#160017 (Make BorrowSet methods public again) - rust-lang/rust#160022 (Refactor rustc_hir re-exports) - rust-lang/rust#160041 (Correct tracking issue for `casefold` feature)

Pkgsrc changes: * Adapt to changes in vendored crate versions. * Version & checksum changes. Upstream changes: Version 1.99.0 (2026-10-01) ========================== Language -------- - [Add allow-by-default `raw_borrows_via_references` lint that checks for references that decay immediately into raw borrows](rust-lang/rust#138230) - [Extend `unconditional_panic` lint to function calls that panic when the chunks/windows size is zero] (rust-lang/rust#153563) - [Stabilize C-variadic function definitions] (rust-lang/rust#155697) - [Stabilize the ability to use `#[unsafe(naked)]` functions to define C-variadic functions (`#![feature(c_variadic_naked_functions)]`).] (rust-lang/rust#159746) - [Trait methods are now resolved on an adjusted never type (producing a FCW)] (rust-lang/rust#156047) - [Coerce from inference variables to trait objects if the inference variable is related via subtyping to a type that is known to be `Sized`] (rust-lang/rust#157820) - [Stabilize `#[my_macro] mod foo;`] (rust-lang/rust#157857). This allows outlined modules (`mod foo;`) anywhere in the body of a custom attribute or derive macro. - [Fix the `overflowing_literals` lint with repeated negation] (rust-lang/rust#158302). For instance, it will now no longer lint on `--128_i8`, which is already detected by the `arithmetic_overflow` lint. - [Add POSIX symbols to the `invalid_runtime_symbol_definitions` and `suspicious_runtime_symbol_definitions` lints] (rust-lang/rust#158522) - [Lint unused `#[path]` attributes on inline modules] (rust-lang/rust#158835) - [Enable `unreachable_cfg_select_predicates` lint as part of `unused` lint group] (rust-lang/rust#159179) - [Stabilize passing 128-bit integers via vector registers with `asm!` on x86] (rust-lang/rust#159525) - [Explicitly document that some allocations are allowed to grow in-place (but none are allowed to shrink)] (rust-lang/rust#159729) - We now [guarantee] (rust-lang/rust#159730) that the contents of an `UnsafeCell` can be accessed without going through `get` - [The `invalid_reference_casting` lint was adjusted accordingly] (rust-lang/rust#159960) - [Account for globally enabled target features in `global_asm!`] (rust-lang/rust#160594) - [Warn if an invalid `doc` attribute is used on a macro invocation] (rust-lang/rust#161003) Compiler -------- - [Convert `-Ctarget-cpu` into a target-modifier for AVR, AMDGCN and NVPTX] (rust-lang/rust#150732) - [Enable `static_position_independent_executables` on all gnu and musl targets] (rust-lang/rust#158510) - When providing a suggestion about a missing method, rustc now prefers an exactly matching name from a [doc alias attribute] (https://doc.rust-lang.org/rustdoc/advanced-features.html#add-aliases-for-an-item-in-documentation-search) over a similarity search from other method names. If your new users sometimes expect a method under a different name, adding a doc alias will now help them find it via rustc suggestions, in addition to helping them find it via rustdoc search: [When suggesting method names, prefer *exact* doc aliases over similar names](rust-lang/rust#160369) Platform Support ---------------- - [Promote `riscv64-unknown-linux-musl` to Tier 2 with host tools] (rust-lang/rust#158766) Refer to Rust's [platform support page][platform-support-doc] for more information on Rust's tiered platform support. [platform-support-doc]: https://doc.rust-lang.org/rustc/platform-support.html Libraries --------- - Iteration on `RangeInclusive` (`a..=b` ranges) is now [optimized better in some circumstances] (rust-lang/rust#155114). As a side effect of this, the behavior of `RangeInclusive` values that has already been exhausted (as an iterator) has changed. For example, the return values of `start()` and `end()` on such ranges may return different values, and using such ranges as slice indexes may have different behavior. These behaviors were not guaranteed to be stable, so these changes are considered to not be breaking changes. - [Relax `transmute_copy` to accept `?Sized` types] (rust-lang/rust#155989) - [Update `transmute_copy` to use a non-unwinding panic] (rust-lang/rust#155989) - [Don't escape U+FF9E and U+FF9F in `escape_debug_ext`] (rust-lang/rust#158057) - [Re-export `core::fmt::NumBuffer` in `alloc` (and `std`)] (rust-lang/rust#161430) Stabilized APIs --------------- - [`IntoIterator` for `Box<[T; N]>`] (https://doc.rust-lang.org/stable/std/iter/trait.IntoIterator.html#impl-IntoIterator-for-Box%3C%5BT;+N%5D,+A%3E) - [`IntoIterator` for `&Box<[T; N]>`] (https://doc.rust-lang.org/stable/std/iter/trait.IntoIterator.html#impl-IntoIterator-for-%26Box%3C%5BT;+N%5D,+A%3E) - [`IntoIterator` for `&mut Box<[T; N]>`] (https://doc.rust-lang.org/stable/std/iter/trait.IntoIterator.html#impl-IntoIterator-for-%26mut+Box%3C%5BT;+N%5D,+A%3E) - [`VecDeque::retain_back`] (https://doc.rust-lang.org/stable/std/collections/struct.VecDeque.html#method.retain_back) - [`core::ffi::VaList`] (https://doc.rust-lang.org/stable/core/ffi/struct.VaList.html) - [`Box::into_non_null`] (https://doc.rust-lang.org/stable/std/boxed/struct.Box.html#method.into_non_null) - [`Box::from_non_null`] (https://doc.rust-lang.org/stable/std/boxed/struct.Box.html#method.from_non_null) - [`Vec::into_parts`] (https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.into_parts) - [`Vec::from_parts`] (https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.from_parts) - [`core::mem::size_of_val_raw`] (https://doc.rust-lang.org/stable/core/mem/fn.size_of_val_raw.html) - [`core::mem::align_of_val_raw`] (https://doc.rust-lang.org/stable/core/mem/fn.align_of_val_raw.html) - [`core::alloc::Layout::for_value_raw`] (https://doc.rust-lang.org/stable/core/alloc/struct.Layout.html#method.for_value_raw) - [`String::from_utf8_lossy_owned`] (https://doc.rust-lang.org/stable/std/string/struct.String.html#method.from_utf8_lossy_owned) - [`string::FromUtf8Error::into_utf8_lossy`] (https://doc.rust-lang.org/stable/std/string/struct.FromUtf8Error.html#method.into_utf8_lossy) - [`FusedIterator for StepBy<I>`] (https://doc.rust-lang.org/stable/std/iter/struct.StepBy.html#impl-FusedIterator-for-StepBy%3CI%3E) - [`std::fs::set_times`] (https://doc.rust-lang.org/stable/std/fs/fn.set_times.html) - [`std::fs::set_times_nofollow`] (https://doc.rust-lang.org/stable/std/fs/fn.set_times_nofollow.html) Cargo ----- - Add a new built-in profile `debug`. This is a preparation for transitioning the `dev` profile away from debugging to give a saner default for faster development iterations. Currently there is no difference between `dev` and `debug` profiles. [docs] (https://doc.rust-lang.org/nightly/cargo/reference/profiles.html#debug-1) [#17214] (rust-lang/cargo#17214) - Workspace members on edition 2024 or later can now override an inherited workspace dependency's `default-features` field. For example, `serde = { workspace = true, default-features = false }` now turns off default features even when the workspace definition enables them. On earlier editions, `default-features = false` is ignored with a warning. ([RFC 3945] (rust-lang/rfcs#3945)) [#17126](rust-lang/cargo#17126) - Incremental compilation is now disabled by default when running in CI. CI is detected via the CI environment variable. [#17220] (rust-lang/cargo#17220) See also the [full Cargo changelog] (https://doc.rust-lang.org/nightly/cargo/CHANGELOG.html#cargo-199-2026-10-01) Rustdoc ----- - [Add new `unused_footnote_definition` rustdoc lint] (rust-lang/rust#137858) - Smarter filtering of trait impls yields performance improvements of 20% on average and up to 40% on some real-world crates. ([1] (rust-lang/rust#159623), [2](rust-lang/rust#159721), [3](rust-lang/rust#159779), [4](rust-lang/rust#159854), [5](rust-lang/rust#159091)) Compatibility Notes ------------------- - [Fully deprecate the legacy integral modules] (rust-lang/rust#146882). For example, `std::i32::MAX` should be accessed via `i32::MAX` instead. - [Upgrade `no_mangle_generic_items` into hard error] (rust-lang/rust#154585) - [The `Pin::new_unchecked` has had its safety invariants changed slightly] (rust-lang/rust#156935) - [Do not promote references to extern statics] (rust-lang/rust#157641) - [Ensure that the inferred types of `let` patterns typecheck] (rust-lang/rust#157841) - [hermit/fs: Return `unsupported()` instead of `from_raw_os_error(22)`] (rust-lang/rust#158247) - [Fixed a bug where `#[repr(simd)]` was accidentally allowed on macro invocations on stable Rust] (rust-lang/rust#158523) - [Abort const-eval when there are generics in the type of the value being produced] (rust-lang/rust#159504) - [Attributes not applying to anything are now an error in code blocks in doc comments] (rust-lang/rust#159849) - [`Box::leak`: tell people to avoid unleaking] (rust-lang/rust#160323) - [PowerPC inline ASM: Fix scalar floats being in the wrong vector lane on little endian] (rust-lang/rust#160441) - [Do not take `doc(cfg())` into account when filtering doctests] (rust-lang/rust#159014) - [Infer anonymous lifetimes in the types of associated consts as `'static`] (rust-lang/rust#156508) - Macros that expand to a semicolon now produce a warning lint (`semicolon_in_expressions_from_non_local_macros`) even when the macro comes from another crate. Previously, such warnings only appeared for macros from the same crate, to avoid showing warnings that can't be fixed locally; however, this masked problems, as integration tests from the crate providing the macro get compiled as a separate crate, so tests often wouldn't reveal this issue. If you encounter a lint like this, please make sure to report it to the crate providing the macro so they can fix it; don't just silence it in your own crate. - [`semicolon_in_expressions_from_macros`: Lint on non-local macros too] (rust-lang/rust#159222) - [Split non-local `semicolon_in_expressions_from_macros` into a separate lint] (rust-lang/rust#159700) Internal Changes ---------------- These changes do not affect any public interfaces of Rust, but they represent significant improvements to the performance or internals of rustc and related tools. - [Update to LLVM 23] (rust-lang/rust#158734)

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Rollup of 15 pull requests #160002

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Urgau added 4 commits July 27, 2026 22:44

Add #[rustc_panics_when_zero] attribute

73d7d8d

Apply #[rustc_panics_when_zero] to the relevant core functions

d67cce7

Encode const params attributes in rmeta

5413066

Lint against iterator functions that panics when N is zero

24e4698

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Rollup of 9 pull requests #160047

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Draft release notes for 1.99.0 #162306

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

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