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Tracking issue for release notes of #140748: Allow storing <code>format_args!()</code> in variable

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

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.

relnotesMarks issues that should be documented in the release notes of the next release.Marks issues that should be documented in the release notes of the next release.

relnotes-tracking-issueMarks issues tracking what text to put in release notes.Marks issues tracking what text to put in release notes.

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.

#142227 In rust-lang/rust;

· rustbot opened on Jun 9, 2025

 ·  

1.89.0

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

Experiment: New format_args!() representation

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

perf-regressionPerformance regression.Performance regression.

S-experimentalStatus: Ongoing experiment that does not require reviewing and won't be merged in its current state.Status: Ongoing experiment that does not require reviewing and won't be merged in its current state.

S-waiting-on-authorStatus: This is awaiting some action (such as code changes or more information) from the author.Status: This is awaiting some action (such as code changes or more information) from the author.

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: Draft (not ready).

rust-lang/rustnumber 137294

#137294 In rust-lang/rust;

· m-ou-se opened on Feb 19, 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