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RFC: Trait Implementation Privacy with <code>permits</code>

T-langRelevant to the language team, which will review and decide on the RFC.Relevant to the language team, which will review and decide on the RFC.

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

Status: Open (in progress).

rust-lang/rfcsnumber 3903

#3903 In rust-lang/rfcs;

· HackingRepo opened on Jan 3, 2026

Thin pointers with inline metadata

T-langRelevant to the language team, which will review and decide on the RFC.Relevant to the language team, which will review and decide on the RFC.

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

Status: Open (in progress).

rust-lang/rfcsnumber 3898

#3898 In rust-lang/rfcs;

· frank-king opened on Dec 22, 2025

RFC: Exhaustive traits. Traits that enable cross trait casting between trait objects.

I-lang-nominatedIndicates that an issue has been nominated for prioritizing at the next lang team meeting.Indicates that an issue has been nominated for prioritizing at the next lang team meeting.

P-lang-drag-2Lang team prioritization drag level 2.Lang team prioritization drag level 2.

T-langRelevant to the language team, which will review and decide on the RFC.Relevant to the language team, which will review and decide on the RFC.

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

Status: Open (in progress).

rust-lang/rfcsnumber 3885

#3885 In rust-lang/rfcs;

· izagawd opened on Nov 24, 2025

Supertrait Auto-impl

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.

T-langRelevant to the language team, which will review and decide on the RFC.Relevant to the language team, which will review and decide on the RFC.

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

Status: Open (in progress).

rust-lang/rfcsnumber 3851

#3851 In rust-lang/rfcs;

· dingxiangfei2009 opened on Aug 26, 2025

RFC: Allow generic impls using local trait bounds

T-langRelevant to the language team, which will review and decide on the RFC.Relevant to the language team, which will review and decide on the RFC.

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

Status: Open (in progress).

rust-lang/rfcsnumber 3821

#3821 In rust-lang/rfcs;

· victorGhiglione opened on May 27, 2025

Local Default Bounds to assist <code>Forget</code> and other <code>?Trait</code>.

T-langRelevant to the language team, which will review and decide on the RFC.Relevant to the language team, which will review and decide on the RFC.

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

Status: Open (in progress).

rust-lang/rfcsnumber 3783

#3783 In rust-lang/rfcs;

· Ddystopia opened on Mar 1, 2025

<code>Forget</code> marker trait

T-langRelevant to the language team, which will review and decide on the RFC.Relevant to the language team, which will review and decide on the RFC.

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

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

Status: Open (in progress).

rust-lang/rfcsnumber 3782

#3782 In rust-lang/rfcs;

· Ddystopia opened on Mar 1, 2025

RFC: Partial Types (v3)

T-langRelevant to the language team, which will review and decide on the RFC.Relevant to the language team, which will review and decide on the RFC.

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

Status: Open (in progress).

rust-lang/rfcsnumber 3736

#3736 In rust-lang/rfcs;

· VitWW opened on Dec 6, 2024

Hierarchy of Sized traits

A-dstProposals re. DSTsProposals re. DSTs

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.

T-langRelevant to the language team, which will review and decide on the RFC.Relevant to the language team, which will review and decide on the RFC.

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

Status: Open (in progress).

rust-lang/rfcsnumber 3729

#3729 In rust-lang/rfcs;

· davidtwco opened on Nov 15, 2024

Generic Integers V2: It's Time

T-langRelevant to the language team, which will review and decide on the RFC.Relevant to the language team, which will review and decide on the RFC.

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

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

Status: Open (in progress).

rust-lang/rfcsnumber 3686

#3686 In rust-lang/rfcs;

· clarfonthey opened on Sep 1, 2024

Support for inferred return types (<code>_</code>) in function signatures

T-langRelevant to the language team, which will review and decide on the RFC.Relevant to the language team, which will review and decide on the RFC.

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

Status: Open.

#3682 In rust-lang/rfcs;

· hagz0r opened on Aug 23, 2024

Externally implementable traits

T-langRelevant to the language team, which will review and decide on the RFC.Relevant to the language team, which will review and decide on the RFC.

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

Status: Open (in progress).

rust-lang/rfcsnumber 3645

#3645 In rust-lang/rfcs;

· Amanieu opened on May 22, 2024