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step_by() on new ranges is less optimized than the old ranges.

A-iteratorsArea: IteratorsArea: Iterators

A-specializationArea: Trait impl specializationArea: Trait impl specialization

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

F-new_range`#![feature(new_range)]``#![feature(new_range)]`

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.

#157754 In rust-lang/rust;

· theemathas opened on Jun 11, 2026

What do we guarantee for RangeIter::remainder?

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

F-new_range`#![feature(new_range)]``#![feature(new_range)]`

requires-nightlyThis issue requires a nightly compiler in some way. When possible, use a F-* label instead.This issue requires a nightly compiler in some way. When possible, use a F-* label instead.

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.

#154443 In rust-lang/rust;

· scottmcm opened on Mar 26, 2026

feature(new_range) applies to macro expansions and breaks their assumptions

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

F-new_range`#![feature(new_range)]``#![feature(new_range)]`

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.

Status: Open.

#148342 In rust-lang/rust;

· kpreid opened on Oct 31, 2025

Decide which methods to add to new Range types

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

F-new_range`#![feature(new_range)]``#![feature(new_range)]`

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.

#125589 In rust-lang/rust;

· traviscross opened on May 26, 2024

Tracking Issue for RFC 3550: New range types

A-maybe-future-editionSomething we may consider for a future edition.Something we may consider for a future edition.

B-RFC-approvedBlocker: Approved by a merged RFC but not yet implemented.Blocker: Approved by a merged RFC but not yet implemented.

C-tracking-issueCategory: An issue tracking the progress of sth. like the implementation of an RFCCategory: An issue tracking the progress of sth. like the implementation of an RFC

F-new_range`#![feature(new_range)]``#![feature(new_range)]`

S-tracking-impl-incompleteStatus: The implementation is incomplete.Status: The implementation is incomplete.

S-tracking-needs-documentationStatus: Needs documentation.Status: Needs documentation.

S-tracking-needs-migration-lintStatus: This item needs a migration lint.Status: This item needs a migration lint.

S-tracking-unimplementedStatus: The feature has not been implemented.Status: The feature has not been implemented.

T-langRelevant to the language teamRelevant to the language team

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.

#123741 In rust-lang/rust;

· traviscross opened on Apr 10, 2024