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Remove support for <code>dyn*</code> from the compiler

A-tidyArea: The tidy toolArea: The tidy tool

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

PG-exploit-mitigationsProject group: Exploit mitigationsProject group: Exploit mitigations

S-waiting-on-borsStatus: Waiting on bors to run and complete tests. Bors will change the label on completion.Status: Waiting on bors to run and complete tests. Bors will change the label on completion.

T-bootstrapRelevant to the bootstrap subteam: Rust's build system (x.py and src/bootstrap)Relevant to the bootstrap subteam: Rust's build system (x.py and src/bootstrap)

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.

WG-trait-system-refactorThe Rustc Trait System Refactor Initiative (-Znext-solver)The Rustc Trait System Refactor Initiative (-Znext-solver)

Status: Open (in progress).

rust-lang/rustnumber 143036

#143036 In rust-lang/rust;

· compiler-errors opened on Jun 26, 2025

<code>impl&lt;T&gt; PointerLike for {Rc,Arc,Weak}&lt;T&gt;</code> can't exist but should

C-feature-requestCategory: A feature request, i.e: not implemented / a PR.Category: A feature request, i.e: not implemented / a PR.

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

Status: Open.

#134591 In rust-lang/rust;

· kpreid opened on Dec 21, 2024

ICE with <code>dyn*</code> and method that takes <code>self</code> by value

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

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

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.

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.

#119694 In rust-lang/rust;

· lukas-code opened on Jan 7, 2024

ice: symbol mangling v0 + <code>dyn_star</code>: <code>cannot be demangled</code>

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

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

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

requires-debug-assertionsThis issue requires a build of rustc or tooling with debug-assertions in some wayThis issue requires a build of rustc or tooling with debug-assertions 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.

#116979 In rust-lang/rust;

· matthiaskrgr opened on Oct 20, 2023

<code>dyn*</code> does not support trait upcasting

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

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.

#104800 In rust-lang/rust;

· compiler-errors opened on Nov 24, 2022

Tracking issue for dyn-star

B-experimentalBlocker: In-tree experiment; RFC pending, not yet approved or unneeded (requires FCP to stabilize).Blocker: In-tree experiment; RFC pending, not yet approved or unneeded (requires FCP to stabilize).

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-dyn_star`#![feature(dyn_star)]``#![feature(dyn_star)]`

T-langRelevant to the language teamRelevant to the language team

Status: Open.

#102425 In rust-lang/rust;

· eholk opened on Sep 28, 2022