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<code>BTreeMap::append_with</code> that allows custom value merges

A-collectionsArea: `std::collections`Area: `std::collections`

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.

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.

Feature Request

#147700 In rust-lang/rust;

· nagisa opened on Oct 14, 2025

std <code>stack_overflow</code> QOI benefits do not seem to justify current complexity

A-collectionsArea: `std::collections`Area: `std::collections`

A-valgrind-full-leakArea: memory leaks detected by valgrind leak-check=fullArea: memory leaks detected by valgrind leak-check=full

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

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.

#146352 In rust-lang/rust;

· AlexanderSchuetz97 opened on Sep 8, 2025

<code>{BTreeMap,BTreeSet}::append</code> behaves differently to <code>::insert</code> and <code>::extend</code>

A-collectionsArea: `std::collections`Area: `std::collections`

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

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.

#145614 In rust-lang/rust;

· tinnamchoi opened on Aug 19, 2025

Tracking issue for release notes of #70530: Tracking Issue for {BTreeMap,BTreeSet}::extract_if

A-collectionsArea: `std::collections`Area: `std::collections`

relnotesMarks issues that should be documented in the release notes of the next release.Marks issues that should be documented in the release notes of the next release.

relnotes-tracking-issueMarks issues tracking what text to put in release notes.Marks issues tracking what text to put in release notes.

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.

#145439 In rust-lang/rust;

· rustbot opened on Aug 15, 2025

<code>this method is equivalent to</code> section of <code>Vec::extract_if</code> seems incorrect

A-collectionsArea: `std::collections`Area: `std::collections`

A-docsArea: Documentation for any part of the project, including the compiler, standard library, and toolsArea: Documentation for any part of the project, including the compiler, standard library, and tools

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.

#142482 In rust-lang/rust;

· your-diary opened on Jun 14, 2025

No way to get mutable reference to Vec member without expressing uniqueness over the full Vec

A-collectionsArea: `std::collections`Area: `std::collections`

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

needs-acpThis change is blocked on the author creating an ACP.This change is blocked on the author creating an ACP.

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.

#134507 In rust-lang/rust;

· orlp opened on Dec 19, 2024

HashMap reallocates even though capacity is not exceeded

A-collectionsArea: `std::collections`Area: `std::collections`

A-docsArea: Documentation for any part of the project, including the compiler, standard library, and toolsArea: Documentation for any part of the project, including the compiler, standard library, and tools

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

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.

#134459 In rust-lang/rust;

· e00E opened on Dec 18, 2024

HashMap: panic in element destructor causes leaks of unrelated elements

A-collectionsArea: `std::collections`Area: `std::collections`

A-destructorsArea: Destructors (`Drop`, …)Area: Destructors (`Drop`, …)

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

I-memleakIssue: Runtime memory leak without `mem::forget`.Issue: Runtime memory leak without `mem::forget`.

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.

#132222 In rust-lang/rust;

· lukas-code opened on Oct 27, 2024

HashMap struct key with <code>'static</code> lifetime screws with return lifetime using methods like <code>.get()</code>

A-collectionsArea: `std::collections`Area: `std::collections`

A-lifetimesArea: Lifetimes / regionsArea: Lifetimes / regions

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

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.

#124614 In rust-lang/rust;

· jsdw opened on May 2, 2024

Explain behaviour and performance of BinaryHeap for equal-ordered elements

A-collectionsArea: `std::collections`Area: `std::collections`

A-docsArea: Documentation for any part of the project, including the compiler, standard library, and toolsArea: Documentation for any part of the project, including the compiler, standard library, and tools

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

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.

#121713 In rust-lang/rust;

· BigWingBeat opened on Feb 27, 2024

std::collections::BTreeMap docs could be improved by answering "When should I choose this over a HashMap"

A-collectionsArea: `std::collections`Area: `std::collections`

A-docsArea: Documentation for any part of the project, including the compiler, standard library, and toolsArea: Documentation for any part of the project, including the compiler, standard library, and tools

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.

#120997 In rust-lang/rust;

· mstange opened on Feb 13, 2024

<code>Vec::from_raw_parts</code> docs do not correctly handle empty buffers

A-collectionsArea: `std::collections`Area: `std::collections`

A-docsArea: Documentation for any part of the project, including the compiler, standard library, and toolsArea: Documentation for any part of the project, including the compiler, standard library, and tools

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.

#119304 In rust-lang/rust;

· oskgo opened on Dec 25, 2023