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Replace <code>#[rustc_do_not_implement_via_object]</code> with <code>#[rustc_dyn_incompatible_trait]</code>

A-attributesArea: Attributes (`#[…]`, `#![…]`)Area: Attributes (`#[…]`, `#![…]`)

S-waiting-on-reviewStatus: Awaiting review from the assignee but also interested parties.Status: Awaiting review from the assignee but also interested parties.

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.

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 148637

#148637 In rust-lang/rust;

· zachs18 opened on Nov 7, 2025

Inhibit all-absent-variant optimization for all enum reprs that inhibit layout optimization, not just repr(C).

S-waiting-on-reviewStatus: Awaiting review from the assignee but also interested parties.Status: Awaiting review from the assignee but also interested parties.

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-langRelevant to the language teamRelevant to the language team

Status: Open (in progress).

rust-lang/rustnumber 146989

#146989 In rust-lang/rust;

· zachs18 opened on Sep 24, 2025

[WIP]: Do not store tag in uninhabited enum variants, or in the single inhabited variant.

A-LLVMArea: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues.Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues.

S-waiting-on-MCPStatus: PR has a compiler MCP and is waiting for the compiler MCP to complete.Status: PR has a compiler MCP and is waiting for the compiler MCP to complete.

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-rust-analyzerRelevant to the rust-analyzer team, which will review and decide on the PR/issue.Relevant to the rust-analyzer team, which will review and decide on the PR/issue.

Status: Draft (not ready).

rust-lang/rustnumber 145337

#145337 In rust-lang/rust;

· zachs18 opened on Aug 13, 2025

Update/relax str/String utf8 safety docs

S-waiting-on-reviewStatus: Awaiting review from the assignee but also interested parties.Status: Awaiting review from the assignee but also interested parties.

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.

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

Status: Open (in progress).

rust-lang/rustnumber 134598

#134598 In rust-lang/rust;

· zachs18 opened on Dec 21, 2024

[WIP] Add support for custom allocator for <code>String</code>

A-tidyArea: The tidy toolArea: The tidy tool

S-blockedStatus: Blocked on something else such as an RFC or other implementation work.Status: Blocked on something else such as an RFC or other implementation work.

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-libs-apiRelevant to the library API team, which will review and decide on the PR/issue.Relevant to the library API team, which will review and decide on the PR/issue.

T-releaseRelevant to the release subteam, which will review and decide on the PR/issue.Relevant to the release subteam, which will review and decide on the PR/issue.

Status: Draft (not ready).

rust-lang/rustnumber 101551

#101551 In rust-lang/rust;

· zachs18 opened on Sep 7, 2022