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<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

<code>RawVec</code> sets capacity incorrectly, causing potentially many bugs

A-allocatorsArea: Custom and system allocatorsArea: Custom and system allocators

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

A-sliceArea: `[T]`Area: `[T]`

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.

#116580 In rust-lang/rust;

· jmaargh opened on Oct 9, 2023

VecDeque missing time complexity docs

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

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.

#100182 In rust-lang/rust;

· ArtifyCZ opened on Aug 5, 2022

Type inference on HashSet

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

A-diagnosticsArea: Messages for errors, warnings, and lintsArea: Messages for errors, warnings, and lints

A-inferenceArea: Type inferenceArea: Type inference

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.

#94969 In rust-lang/rust;

· Yuri6037 opened on Mar 15, 2022

Vec::pop() sometimes returns value inefficiently.

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

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

I-slowIssue: Problems and improvements with respect to performance of generated code.Issue: Problems and improvements with respect to performance of generated code.

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.

#85365 In rust-lang/rust;

· human-0 opened on May 16, 2021