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Tracking Issue for breaking lifetime changing raw pointer casts of trait objects

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

A-raw-pointersArea: raw pointers, MaybeUninit, NonNullArea: raw pointers, MaybeUninit, NonNull

C-tracking-issueCategory: An issue tracking the progress of sth. like the implementation of an RFCCategory: An issue tracking the progress of sth. like the implementation of an RFC

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

F-derive_coerce_pointeeFeature: RFC 3621's oft-renamed implementationFeature: RFC 3621's oft-renamed implementation

T-langRelevant to the language teamRelevant to the language team

Status: Open.

#141402 In rust-lang/rust;

· BoxyUwU opened on May 22, 2025

Nested but non-conflicting projection predicates emerging from supertrait bounds leads to ambiguity

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

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

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

Status: Open.

#140217 In rust-lang/rust;

· dingxiangfei2009 opened on Apr 23, 2025

arbitrary_self_type: insert implied Receiver bound on Deref

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

S-waiting-on-authorStatus: This is awaiting some action (such as code changes or more information) from the author.Status: This is awaiting some action (such as code changes or more information) from the author.

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.

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

Status: Open (in progress).

rust-lang/rustnumber 138952

#138952 In rust-lang/rust;

· dingxiangfei2009 opened on Mar 25, 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

arbitrary_self_types + derive_coerce_pointee allows calling methods whose where clauses are violated

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

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

F-derive_coerce_pointeeFeature: RFC 3621's oft-renamed implementationFeature: RFC 3621's oft-renamed implementation

T-langRelevant to the language teamRelevant to the language team

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

Status: Open.

#136702 In rust-lang/rust;

· RalfJung opened on Feb 7, 2025

Better error reporting for <code>T: ?Sized</code> types when <code>impl Receiver for MyType&lt;T&gt;</code> is implicitly sized

A-diagnosticsArea: Messages for errors, warnings, and lintsArea: Messages for errors, warnings, and lints

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

D-confusingDiagnostics: Confusing error or lint that should be reworked.Diagnostics: Confusing error or lint that should be reworked.

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

Status: Open.

#134390 In rust-lang/rust;

· compiler-errors opened on Dec 16, 2024

Tracking issue for future-incompatibility lint <code>ptr_cast_add_auto_to_object</code>

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

A-lintsArea: Lints (warnings about flaws in source code) such as unused_mut.Area: Lints (warnings about flaws in source code) such as unused_mut.

A-raw-pointersArea: raw pointers, MaybeUninit, NonNullArea: raw pointers, MaybeUninit, NonNull

C-future-incompatibilityCategory: Future-incompatibility lintsCategory: Future-incompatibility lints

C-tracking-issueCategory: An issue tracking the progress of sth. like the implementation of an RFCCategory: An issue tracking the progress of sth. like the implementation of an RFC

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

F-derive_coerce_pointeeFeature: RFC 3621's oft-renamed implementationFeature: RFC 3621's oft-renamed implementation

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.

#127323 In rust-lang/rust;

· WaffleLapkin opened on Jul 4, 2024

rustc performs auto-ref when a raw pointer would be enough

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.

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

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.

#73987 In rust-lang/rust;

· RalfJung opened on Jul 3, 2020

arbitrary self types causes unexpected error messages

A-diagnosticsArea: Messages for errors, warnings, and lintsArea: Messages for errors, warnings, and lints

C-enhancementCategory: An issue proposing an enhancement or a PR with one.Category: An issue proposing an enhancement or a PR with one.

D-confusingDiagnostics: Confusing error or lint that should be reworked.Diagnostics: Confusing error or lint that should be reworked.

D-papercutDiagnostics: An error or lint that needs small tweaks.Diagnostics: An error or lint that needs small tweaks.

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

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.

#69069 In rust-lang/rust;

· nikomatsakis opened on Feb 11, 2020

<code>ManuallyDrop</code> should be a dyn-compatible receiver type

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

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

T-langRelevant to the language teamRelevant to the language team

Status: Open.

#64351 In rust-lang/rust;

· withoutboats opened on Sep 10, 2019

ICE in object_safety.rs due to method receiver not having a layout

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)]`

glacierICE tracked in rust-lang/glacier.ICE tracked in rust-lang/glacier.

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.

#57276 In rust-lang/rust;

· mikeyhew opened on Jan 2, 2019

Tracking issue for RFC 3519: <code>arbitrary_self_types</code>

B-RFC-approvedBlocker: Approved by a merged RFC but not yet implemented.Blocker: Approved by a merged RFC but not yet implemented.

B-unstableBlocker: Implemented in the nightly compiler and unstable.Blocker: Implemented in the nightly compiler and unstable.

C-tracking-issueCategory: An issue tracking the progress of sth. like the implementation of an RFCCategory: An issue tracking the progress of sth. like the implementation of an RFC

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

S-tracking-needs-summaryStatus: It's hard to tell what's been done and what hasn't! Someone should do some investigation.Status: It's hard to tell what's been done and what hasn't! Someone should do some investigation.

S-types-deferredStatus: Identified as a valid potential future enhancement that is not currently being worked onStatus: Identified as a valid potential future enhancement that is not currently being worked on

T-langRelevant to the language teamRelevant to the language team

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

Status: Open.

#44874 In rust-lang/rust;

· arielb1 opened on Sep 26, 2017