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Draft release notes for 1.87
#140133 opened Apr 21, 2025 by BoxyUwU
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Issues list

Enum layout should allow multiple untagged variants if they have nonoverlapping values A-layout Area: Memory layout of types C-optimization Category: An issue highlighting optimization opportunities or PRs implementing such T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#139148 opened Mar 30, 2025 by lolbinarycat
ICE using repr(align(…)) type as trait object receiver (arbitrary self-type) A-dyn-trait Area: trait objects, vtable layout A-layout Area: Memory layout of types C-bug Category: This is a bug. F-arbitrary_self_types `#![feature(arbitrary_self_types)]` F-dispatch_from_dyn `#![feature(dispatch_from_dyn)]` I-ICE Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️ requires-nightly This issue requires a nightly compiler in some way. S-bug-has-test Status: This bug is tracked inside the repo by a `known-bug` test. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#138564 opened Mar 16, 2025 by steffahn
1
Should Option<u128> use a smaller (maybe usize) tag? A-layout Area: Memory layout of types C-discussion Category: Discussion or questions that doesn't represent real issues. C-optimization Category: An issue highlighting optimization opportunities or PRs implementing such T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#138332 opened Mar 11, 2025 by scottmcm
4
ICE: fn_abi_of_instance(foo, []) failed: Layout(Unknown(Foo)) A-layout Area: Memory layout of types A-repr Area: the `#[repr(stuff)]` attribute C-bug Category: This is a bug. I-ICE Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️ S-bug-has-test Status: This bug is tracked inside the repo by a `known-bug` test. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#138008 opened Mar 4, 2025 by matthiaskrgr
1
Layout optimization fails for enums with variants having values 0 and 255 A-layout Area: Memory layout of types C-bug Category: This is a bug. C-optimization Category: An issue highlighting optimization opportunities or PRs implementing such
#136444 opened Feb 2, 2025 by Kixunil
2
rustc accepts types requiring a greater-than-48-bit address space A-layout Area: Memory layout of types C-discussion Category: Discussion or questions that doesn't represent real issues. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#132525 opened Nov 2, 2024 by shao-hua-li
3
Rust doesn't use niche in reference (or pointer) to slice A-layout Area: Memory layout of types C-optimization Category: An issue highlighting optimization opportunities or PRs implementing such E-needs-design This issue needs exploration and design to see how and if we can fix/implement it T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#132235 opened Oct 27, 2024 by VorfeedCanal
14
ICE: Layout::compute: unexpected type _ A-layout Area: Memory layout of types C-bug Category: This is a bug. I-ICE Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️ P-medium Medium priority regression-from-stable-to-stable Performance or correctness regression from one stable version to another. S-bug-has-test Status: This bug is tracked inside the repo by a `known-bug` test. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#130104 opened Sep 8, 2024 by matthiaskrgr
2
ICE: assertion failed: layout.is_sized() with feature(associated_const_equality) A-layout Area: Memory layout of types C-bug Category: This is a bug. E-needs-test Call for participation: An issue has been fixed and does not reproduce, but no test has been added. F-associated_const_equality `#![feature(associated_const_equality)]` I-ICE Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️ S-bug-has-test Status: This bug is tracked inside the repo by a `known-bug` test. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#127643 opened Jul 12, 2024 by Naserume
1
@workingjubilee
2
ICE: layout mismatch for result of MulWithOverflow A-layout Area: Memory layout of types C-bug Category: This is a bug. F-generic_const_exprs `#![feature(generic_const_exprs)]` I-ICE Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️ requires-incomplete-features This issue requires the use of incomplete features. S-bug-has-test Status: This bug is tracked inside the repo by a `known-bug` test. S-has-mcve Status: A Minimal Complete and Verifiable Example has been found for this issue T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#125772 opened May 30, 2024 by matthiaskrgr
@workingjubilee
1
ICE: SizeSkeleton::compute layout errored in layout.rs A-layout Area: Memory layout of types C-bug Category: This is a bug. F-impl_trait_in_assoc_type `#![feature(impl_trait_in_assoc_type)]` I-ICE Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️ S-bug-has-test Status: This bug is tracked inside the repo by a `known-bug` test. S-has-mcve Status: A Minimal Complete and Verifiable Example has been found for this issue T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#125758 opened May 30, 2024 by cushionbadak
@workingjubilee
1
Niche in Arc<..> variant of enum not used by Option<..> A-layout Area: Memory layout of types C-optimization Category: An issue highlighting optimization opportunities or PRs implementing such T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#125363 opened May 21, 2024 by horazont
2
ICE: Unsigned value 0x100 does not fit in 8 bits A-layout Area: Memory layout of types A-MIR Area: Mid-level IR (MIR) - https://blog.rust-lang.org/2016/04/19/MIR.html C-bug Category: This is a bug. E-needs-mcve Call for participation: This issue has a repro, but needs a Minimal Complete and Verifiable Example I-ICE Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️ S-bug-has-test Status: This bug is tracked inside the repo by a `known-bug` test. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#123690 opened Apr 9, 2024 by matthiaskrgr
4
underflow while calculating type sizes A-layout Area: Memory layout of types C-bug Category: This is a bug. I-ICE Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️ requires-debug-assertions This issue requires a build of rustc or tooling with debug-assertions in some way S-has-mcve Status: A Minimal Complete and Verifiable Example has been found for this issue T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#122547 opened Mar 15, 2024 by matthiaskrgr
9
Enums don't utilize niches across multiple data-carrying variants A-layout Area: Memory layout of types C-bug Category: This is a bug. C-optimization Category: An issue highlighting optimization opportunities or PRs implementing such S-has-mcve Status: A Minimal Complete and Verifiable Example has been found for this issue T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#121333 opened Feb 20, 2024 by LunarLambda
Missed layout optimisation with multiple niches A-layout Area: Memory layout of types C-optimization Category: An issue highlighting optimization opportunities or PRs implementing such T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#119507 opened Jan 2, 2024 by GnomedDev
1
Enum field align cause performance degradation about 10x A-layout Area: Memory layout of types C-optimization Category: An issue highlighting optimization opportunities or PRs implementing such I-slow Issue: Problems and improvements with respect to performance of generated code. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#119247 opened Dec 23, 2023 by PureWhiteWu
12
Missed niche optimization A-layout Area: Memory layout of types C-optimization Category: An issue highlighting optimization opportunities or PRs implementing such T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#119055 opened Dec 17, 2023 by Jules-Bertholet
3
std::mem::size_of::<Result<char,u16>>() says 8 when 4 should be feasible A-layout Area: Memory layout of types C-enhancement Category: An issue proposing an enhancement or a PR with one. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#118367 opened Nov 27, 2023 by hsivonen
Sub-optimal layout of Option<(u16, [u8; 15])> (missed niche optimization) A-layout Area: Memory layout of types C-enhancement Category: An issue proposing an enhancement or a PR with one. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#117429 opened Oct 31, 2023 by gendx
3
Wrong alignment for m68k pointer types A-layout Area: Memory layout of types C-bug Category: This is a bug. O-motorola68k Target: Rust from the parallel universe where the Amiga won.
#117252 opened Oct 26, 2023 by antoyo
3
Enum size depends on ordering of members A-layout Area: Memory layout of types C-bug Category: This is a bug. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#117238 opened Oct 26, 2023 by tromey
1
13
Layout Variants::Multiple has tons of redundancy, e.g. Scalar enums have Aggregate variants A-layout Area: Memory layout of types C-cleanup Category: PRs that clean code up or issues documenting cleanup. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#113988 opened Jul 23, 2023 by RalfJung
9
repr(transparent) newtypes do not preserved preferred alignment A-layout Area: Memory layout of types A-repr Area: the `#[repr(stuff)]` attribute T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#109560 opened Mar 24, 2023 by RalfJung
Tracking issue for -Z randomize-layout -Zrandomize-layout Unstable option: Randomize the layout of types. A-CLI Area: Command-line interface (CLI) to the compiler A-layout Area: Memory layout of types C-tracking-issue Category: An issue tracking the progress of sth. like the implementation of an RFC S-tracking-impl-incomplete Status: The implementation is incomplete. S-tracking-needs-documentation Status: Needs documentation. S-tracking-needs-summary Status: It's hard to tell what's been done and what hasn't! Someone should do some investigation. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#106764 opened Jan 12, 2023 by dtolnay
1 of 3 tasks
1
ProTip! Find all open issues with in progress development work with linked:pr.