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<code>io::stdin().read_to_end()</code> drops a byte on certain Unicode input (Windows only)

A-ioArea: `std::io`, `std::fs`, `std::net` and `std::path`Area: `std::io`, `std::fs`, `std::net` and `std::path`

A-UnicodeArea: UnicodeArea: Unicode

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

O-windowsOperating system: WindowsOperating system: Windows

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.

#142847 In rust-lang/rust;

· QuaeroEtTego opened on Jun 21, 2025

<code>char_indices</code> is slower than while loop over ascii <code>Chars</code>, but faster for unicode

A-UnicodeArea: UnicodeArea: Unicode

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

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.

#141855 In rust-lang/rust;

· hkBst opened on Jun 1, 2025

unicode code point suggestion for non-ASCII character in byte string literal is incorrect

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

A-suggestion-diagnosticsArea: Suggestions generated by the compiler applied by `cargo fix`Area: Suggestions generated by the compiler applied by `cargo fix`

A-UnicodeArea: UnicodeArea: Unicode

D-invalid-suggestionDiagnostics: A structured suggestion resulting in incorrect code.Diagnostics: A structured suggestion resulting in incorrect 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.

#139226 In rust-lang/rust;

· mozkeeler opened on Apr 1, 2025

Identifiers with combining characters do not work as captured identifiers in <code>println!</code> format strings

A-fmtArea: `core::fmt`Area: `core::fmt`

A-proc-macrosArea: Procedural macrosArea: Procedural macros

A-UnicodeArea: UnicodeArea: Unicode

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

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.

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.

#137063 In rust-lang/rust;

· interactive-toast opened on Feb 15, 2025

Warn on Fullwidth Exclamation Mark (U+FF01) in comment

A-lintsArea: Lints (warnings about flaws in source code) such as unused_mut.Area: Lints (warnings about flaws in source code) such as unused_mut.

A-UnicodeArea: UnicodeArea: Unicode

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

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.

T-rustdocRelevant to the rustdoc team, which will review and decide on the PR/issue.Relevant to the rustdoc team, which will review and decide on the PR/issue.

Status: Open.

#134810 In rust-lang/rust;

· dtolnay opened on Dec 27, 2024

Cannot use unicode identifiers in <code>--extern</code> flags

A-cratesArea: Crates and their interactions (like crate loading)Area: Crates and their interactions (like crate loading)

A-metadataArea: Crate metadataArea: Crate metadata

A-UnicodeArea: UnicodeArea: Unicode

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

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.

#134250 In rust-lang/rust;

· Nemo157 opened on Dec 13, 2024

The diagnostic emitter doesn't deal with non-ASCII characters correctly when eliding parts of overly long source lines

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

A-UnicodeArea: UnicodeArea: Unicode

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

D-diagnostic-infraDiagnostics: Issues that affect all diagnostics, or relate to the diagnostic machinery itself.Diagnostics: Issues that affect all diagnostics, or relate to the diagnostic machinery itself.

P-lowLow priorityLow priority

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.

#132860 In rust-lang/rust;

· fmease opened on Nov 10, 2024

Number types' <code>FromStr</code> impl should recognize Unicode minus

A-UnicodeArea: UnicodeArea: Unicode

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

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.

#130315 In rust-lang/rust;

· Enyium opened on Sep 13, 2024

Create an internal lint for detecting "Unicode-unaware" <code>BytePos</code> &amp; <code>Span</code> manipulations

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

A-lintsArea: Lints (warnings about flaws in source code) such as unused_mut.Area: Lints (warnings about flaws in source code) such as unused_mut.

A-UnicodeArea: UnicodeArea: Unicode

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

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

D-Unicode-unawareDiagnostics: Diagnostics that are unaware of Unicode and trigger codepoint boundary assertionsDiagnostics: Diagnostics that are unaware of Unicode and trigger codepoint boundary assertions

P-lowLow priorityLow priority

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.

#128790 In rust-lang/rust;

· fmease opened on Aug 7, 2024

NFC normalisation of lifetimes and labels

A-UnicodeArea: UnicodeArea: Unicode

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.

T-langRelevant to the language teamRelevant to the language team

Status: Open.

#126759 In rust-lang/rust;

· mattheww opened on Jun 20, 2024

Lint against non-NFC items?

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

A-lintsArea: Lints (warnings about flaws in source code) such as unused_mut.Area: Lints (warnings about flaws in source code) such as unused_mut.

A-UnicodeArea: UnicodeArea: Unicode

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.

#120723 In rust-lang/rust;

· workingjubilee opened on Feb 6, 2024

<code>uncommon_codepoints</code> is only checked post-NFC

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

A-lintsArea: Lints (warnings about flaws in source code) such as unused_mut.Area: Lints (warnings about flaws in source code) such as unused_mut.

A-UnicodeArea: UnicodeArea: Unicode

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

L-uncommon_codepointsLint: uncommon_codepointsLint: uncommon_codepoints

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.

#120697 In rust-lang/rust;

· Jules-Bertholet opened on Feb 6, 2024