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<code>Receiver</code> and <code>DispatchFromDyn</code> probably shouldn't be dyn-compatible?

A-dyn-compatibilityArea: Dyn compatibility (formerly: object safety)Area: Dyn compatibility (formerly: object safety)

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)]`

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.

#149094 In rust-lang/rust;

· theemathas opened on Nov 19, 2025

Unsoundness and ICE due to <code>DispatchFromDyn</code> allowing bogus impls on references.

A-dyn-compatibilityArea: Dyn compatibility (formerly: object safety)Area: Dyn compatibility (formerly: object safety)

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) ❄️

I-lang-radarItems that are on lang's radar and will need eventual work or consideration.Items that are on lang's radar and will need eventual work or consideration.

I-unsoundIssue: A soundness hole (worst kind of bug), see: https://en.wikipedia.org/wiki/SoundnessIssue: A soundness hole (worst kind of bug), see: https://en.wikipedia.org/wiki/Soundness

needs-triageThis issue may need triage. Remove it if it has been sufficiently triaged.This issue may need triage. Remove it if it has been sufficiently triaged.

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

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-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.

#148727 In rust-lang/rust;

· theemathas opened on Nov 9, 2025

<code>DispatchFromDyn</code> impls don't have their lifetime bounds checked

A-dyn-compatibilityArea: Dyn compatibility (formerly: object safety)Area: Dyn compatibility (formerly: object safety)

A-lifetimesArea: Lifetimes / regionsArea: Lifetimes / regions

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)]`

fixed-by-next-solverFixed by the next-generation trait solver, `-Znext-solver`.Fixed by the next-generation trait solver, `-Znext-solver`.

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

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-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.

#148726 In rust-lang/rust;

· theemathas opened on Nov 9, 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