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Missed optimization for format whose argument is a known static string

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

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.

#144328 In rust-lang/rust;

· jrose-signal opened on Jul 22, 2025

<code>format!</code> does not support width/alignment with <code>#x</code>

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

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

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

E-mediumCall for participation: Medium difficulty. Experience needed to fix: Intermediate.Call for participation: Medium difficulty. Experience needed to fix: Intermediate.

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.

#144023 In rust-lang/rust;

· dhardy opened on Jul 16, 2025

Unuseful span in type error in some format_args!() invocations

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

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

D-imprecise-spansDiagnostics: spans don't point to exactly the erroneous codeDiagnostics: spans don't point to exactly the erroneous code

E-help-wantedCall for participation: Help is requested to fix this issue.Call for participation: Help is requested to fix this issue.

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.

#140578 In rust-lang/rust;

· m-ou-se opened on May 2, 2025

ICE: <code>format_args!</code> optimization can construct a <code>&amp;str</code> longer than <code>isize::MAX</code>

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

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

I-ICEIssue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️

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.

#138811 In rust-lang/rust;

· thaliaarchi opened on Mar 21, 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

dbg! prints can tear in multi-threading code

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

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

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.

WG-debuggingWorking group: Bad Rust debugging experiencesWorking group: Bad Rust debugging experiences

Status: Open.

#136703 In rust-lang/rust;

· orlp opened on Feb 7, 2025

<code>Path</code>/<code>OsStr</code> incorrectly handle <code>Formatter</code> flags

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

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.

#136617 In rust-lang/rust;

· thaliaarchi opened on Feb 6, 2025

absent precision parameter for floating point format string is undocumented

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-floating-pointArea: Floating point numbers and arithmeticArea: Floating point numbers and arithmetic

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

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.

#131159 In rust-lang/rust;

· e00E opened on Oct 2, 2024

Decimal formatting for some floating point numbers does not round-to-even

A-floating-pointArea: Floating point numbers and arithmeticArea: Floating point numbers and arithmetic

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

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-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.

#130936 In rust-lang/rust;

· gregates opened on Sep 27, 2024

generated call to core::fmt::Arguments::new_const fails to constant fold

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

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.

#128709 In rust-lang/rust;

· lolbinarycat opened on Aug 5, 2024

Inconsistent format string support for binary and hex representations of arrays

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

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

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

D-papercutDiagnostics: An error or lint that needs small tweaks.Diagnostics: An error or lint that needs small tweaks.

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.

#119300 In rust-lang/rust;

· ChaiTRex opened on Dec 25, 2023

Cannot round trip parsing <code>-1</code> as non-decimal

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

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

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.

#115545 In rust-lang/rust;

· Shadow53 opened on Sep 4, 2023