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Performance problem in for loops with step_by(run-time-variable)

A-iteratorsArea: IteratorsArea: Iterators

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

C-optimizationCategory: An issue highlighting optimization opportunities or PRs implementing suchCategory: An issue highlighting optimization opportunities or PRs implementing such

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

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.

#141360 In rust-lang/rust;

· leonardo-m opened on May 21, 2025

Default implementation on std::iter::Fuse should not requires Default on the inner iterator

A-iteratorsArea: IteratorsArea: Iterators

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.

#140961 In rust-lang/rust;

· ultimaweapon opened on May 13, 2025

Panic-safety issue with <code>Zip</code> specializations

A-iteratorsArea: IteratorsArea: Iterators

A-specializationArea: Trait impl specializationArea: Trait impl specialization

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

I-unsoundIssue: A soundness hole (worst kind of bug), see: https://en.wikipedia.org/wiki/SoundnessIssue: A soundness hole (worst kind of bug), see: https://en.wikipedia.org/wiki/Soundness

P-highHigh priorityHigh priority

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.

#137255 In rust-lang/rust;

· steffahn opened on Feb 19, 2025

The implementation of <code>InPlaceIterable</code> for <code>Flatten</code>&amp;<code>FlatMap</code> is unsound

A-iteratorsArea: IteratorsArea: Iterators

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

I-unsoundIssue: A soundness hole (worst kind of bug), see: https://en.wikipedia.org/wiki/SoundnessIssue: A soundness hole (worst kind of bug), see: https://en.wikipedia.org/wiki/Soundness

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.

#135103 In rust-lang/rust;

· steffahn opened on Jan 4, 2025

Broken loop unrolling in branchy loop

A-codegenArea: Code generationArea: Code generation

A-iteratorsArea: IteratorsArea: Iterators

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.

Status: Open.

#117659 In rust-lang/rust;

· dragostis opened on Nov 7, 2023

Missed optimization on short known length iterator

A-iteratorsArea: IteratorsArea: Iterators

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.

C-optimizationCategory: An issue highlighting optimization opportunities or PRs implementing suchCategory: An issue highlighting optimization opportunities or PRs implementing such

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

Status: Open.

#113691 In rust-lang/rust;

· e00E opened on Jul 14, 2023

<code>successors</code> is 2x slower than <code>map</code>

A-iteratorsArea: IteratorsArea: Iterators

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

C-optimizationCategory: An issue highlighting optimization opportunities or PRs implementing suchCategory: An issue highlighting optimization opportunities or PRs implementing such

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.

#113055 In rust-lang/rust;

· Centri3 opened on Jun 26, 2023

Missed optimization when computing <code>max</code> on an iterator

A-iteratorsArea: IteratorsArea: Iterators

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.

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

C-optimizationCategory: An issue highlighting optimization opportunities or PRs implementing suchCategory: An issue highlighting optimization opportunities or PRs implementing such

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

Status: Open.

#110595 In rust-lang/rust;

· xTachyon opened on Apr 20, 2023

Documentation for HashMap's FromIterator with duplicate keys in the iterator

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

A-iteratorsArea: IteratorsArea: Iterators

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.

#110260 In rust-lang/rust;

· jrose-signal opened on Apr 12, 2023

Taking exact number of elements from range iterator causes interger overflow

A-iteratorsArea: IteratorsArea: Iterators

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.

#110196 In rust-lang/rust;

· nazar-pc opened on Apr 11, 2023

Unable to call reverse on a Zip Iterator zipping a std::iter::Repeat

A-iteratorsArea: IteratorsArea: Iterators

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.

#104729 In rust-lang/rust;

· IceTDrinker opened on Nov 22, 2022

Add track_caller to iterator methods

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

A-error-handlingArea: Error handlingArea: Error handling

A-iteratorsArea: IteratorsArea: Iterators

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

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.

#102024 In rust-lang/rust;

· xxchan opened on Sep 19, 2022