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Enum layout should allow multiple untagged variants if they have nonoverlapping values

A-layoutArea: Memory layout of typesArea: Memory layout of types

C-optimizationCategory: An issue highlighting optimization opportunities or PRs implementing suchCategory: An issue highlighting optimization opportunities or PRs implementing such

T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.Relevant to the compiler team, which will review and decide on the PR/issue.

Status: Open.

#139148 In rust-lang/rust;

· lolbinarycat opened on Mar 30, 2025

ICE using <code>repr(align(…))</code> type as trait object receiver (arbitrary <code>self</code>-type)

A-dyn-traitArea: trait objects, vtable layoutArea: trait objects, vtable layout

A-layoutArea: Memory layout of typesArea: Memory layout of types

C-bugCategory: This is a bug.Category: This is a bug.

F-arbitrary_self_types`#![feature(arbitrary_self_types)]``#![feature(arbitrary_self_types)]`

F-dispatch_from_dyn`#![feature(dispatch_from_dyn)]``#![feature(dispatch_from_dyn)]`

I-ICEIssue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️

requires-nightlyThis issue requires a nightly compiler in some way.This issue requires a nightly compiler in some way.

S-bug-has-testStatus: This bug is tracked inside the repo by a `known-bug` test.Status: This bug is tracked inside the repo by a `known-bug` test.

T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.Relevant to the compiler team, which will review and decide on the PR/issue.

Status: Open.

#138564 In rust-lang/rust;

· steffahn opened on Mar 16, 2025

Should <code>Option&lt;u128&gt;</code> use a smaller (maybe usize) tag?

A-layoutArea: Memory layout of typesArea: Memory layout of types

C-discussionCategory: Discussion or questions that doesn't represent real issues.Category: Discussion or questions that doesn't represent real issues.

C-optimizationCategory: An issue highlighting optimization opportunities or PRs implementing suchCategory: An issue highlighting optimization opportunities or PRs implementing such

T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.Relevant to the compiler team, which will review and decide on the PR/issue.

Status: Open.

#138332 In rust-lang/rust;

· scottmcm opened on Mar 11, 2025

ICE: <code>fn_abi_of_instance(foo, [])</code> failed: Layout(Unknown(Foo))

A-layoutArea: Memory layout of typesArea: Memory layout of types

A-reprArea: the `#[repr(stuff)]` attributeArea: the `#[repr(stuff)]` attribute

C-bugCategory: This is a bug.Category: This is a bug.

I-ICEIssue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️

S-bug-has-testStatus: This bug is tracked inside the repo by a `known-bug` test.Status: This bug is tracked inside the repo by a `known-bug` test.

T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.Relevant to the compiler team, which will review and decide on the PR/issue.

Status: Open.

#138008 In rust-lang/rust;

· matthiaskrgr opened on Mar 4, 2025

Layout optimization fails for enums with variants having values 0 and 255

A-layoutArea: Memory layout of typesArea: Memory layout of types

C-bugCategory: This is a bug.Category: This is a bug.

C-optimizationCategory: An issue highlighting optimization opportunities or PRs implementing suchCategory: An issue highlighting optimization opportunities or PRs implementing such

Status: Open.

#136444 In rust-lang/rust;

· Kixunil opened on Feb 2, 2025

rustc accepts types requiring a greater-than-48-bit address space

A-layoutArea: Memory layout of typesArea: Memory layout of types

C-discussionCategory: Discussion or questions that doesn't represent real issues.Category: Discussion or questions that doesn't represent real issues.

T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.Relevant to the compiler team, which will review and decide on the PR/issue.

Status: Open.

#132525 In rust-lang/rust;

· shao-hua-li opened on Nov 2, 2024

Rust doesn't use niche in reference (or pointer) to slice

A-layoutArea: Memory layout of typesArea: Memory layout of types

C-optimizationCategory: An issue highlighting optimization opportunities or PRs implementing suchCategory: An issue highlighting optimization opportunities or PRs implementing such

E-needs-designThis issue needs exploration and design to see how and if we can fix/implement itThis issue needs exploration and design to see how and if we can fix/implement it

T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.Relevant to the compiler team, which will review and decide on the PR/issue.

Status: Open.

#132235 In rust-lang/rust;

· VorfeedCanal opened on Oct 27, 2024

ICE: Layout::compute: unexpected type <code>_</code>

A-layoutArea: Memory layout of typesArea: Memory layout of types

C-bugCategory: This is a bug.Category: This is a bug.

I-ICEIssue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️

P-mediumMedium priorityMedium priority

regression-from-stable-to-stablePerformance or correctness regression from one stable version to another.Performance or correctness regression from one stable version to another.

S-bug-has-testStatus: This bug is tracked inside the repo by a `known-bug` test.Status: This bug is tracked inside the repo by a `known-bug` test.

T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.Relevant to the compiler team, which will review and decide on the PR/issue.

Status: Open.

#130104 In rust-lang/rust;

· matthiaskrgr opened on Sep 8, 2024

ICE: <code>assertion failed: layout.is_sized()</code> with <code>feature(associated_const_equality)</code>

A-layoutArea: Memory layout of typesArea: Memory layout of types

C-bugCategory: This is a bug.Category: This is a bug.

E-needs-testCall for participation: An issue has been fixed and does not reproduce, but no test has been added.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)]``#![feature(associated_const_equality)]`

I-ICEIssue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️

S-bug-has-testStatus: This bug is tracked inside the repo by a `known-bug` test.Status: This bug is tracked inside the repo by a `known-bug` test.

T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.Relevant to the compiler team, which will review and decide on the PR/issue.

Status: Open.

#127643 In rust-lang/rust;

· Naserume opened on Jul 12, 2024

ICE: <code>layout mismatch for result of MulWithOverflow</code>

A-layoutArea: Memory layout of typesArea: Memory layout of types

C-bugCategory: This is a bug.Category: This is a bug.

F-generic_const_exprs`#![feature(generic_const_exprs)]``#![feature(generic_const_exprs)]`

I-ICEIssue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️

requires-incomplete-featuresThis issue requires the use of incomplete features.This issue requires the use of incomplete features.

S-bug-has-testStatus: This bug is tracked inside the repo by a `known-bug` test.Status: This bug is tracked inside the repo by a `known-bug` test.

S-has-mcveStatus: A Minimal Complete and Verifiable Example has been found for this issueStatus: A Minimal Complete and Verifiable Example has been found for this issue

T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.Relevant to the compiler team, which will review and decide on the PR/issue.

Status: Open.

#125772 In rust-lang/rust;

· matthiaskrgr opened on May 30, 2024

Niche in Arc&lt;..&gt; variant of enum not used by Option&lt;..&gt;

A-layoutArea: Memory layout of typesArea: Memory layout of types

C-optimizationCategory: An issue highlighting optimization opportunities or PRs implementing suchCategory: An issue highlighting optimization opportunities or PRs implementing such

T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.Relevant to the compiler team, which will review and decide on the PR/issue.

Status: Open.

#125363 In rust-lang/rust;

· horazont opened on May 21, 2024

ICE: <code>Unsigned value 0x100 does not fit in 8 bits</code>

A-layoutArea: Memory layout of typesArea: Memory layout of types

A-MIRArea: Mid-level IR (MIR) - https://blog.rust-lang.org/2016/04/19/MIR.htmlArea: Mid-level IR (MIR) - https://blog.rust-lang.org/2016/04/19/MIR.html

C-bugCategory: This is a bug.Category: This is a bug.

E-needs-mcveCall for participation: This issue has a repro, but needs a Minimal Complete and Verifiable ExampleCall for participation: This issue has a repro, but needs a Minimal Complete and Verifiable Example

I-ICEIssue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️

S-bug-has-testStatus: This bug is tracked inside the repo by a `known-bug` test.Status: This bug is tracked inside the repo by a `known-bug` test.

T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.Relevant to the compiler team, which will review and decide on the PR/issue.

Status: Open.

#123690 In rust-lang/rust;

· matthiaskrgr opened on Apr 9, 2024