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Issues: rust-lang/rust

Draft release notes for 1.87
#140133 opened Apr 21, 2025 by BoxyUwU
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Issues list

Unuseful span in type error in some format_args!() invocations A-diagnostics Area: Messages for errors, warnings, and lints A-fmt Area: `core::fmt` D-imprecise-spans Diagnostics: spans don't point to exactly the erroneous code E-help-wanted Call for participation: Help is requested to fix this issue. P-low Low priority T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#140578 opened May 2, 2025 by m-ou-se
ICE: format_args! optimization can construct a &str longer than isize::MAX A-fmt Area: `core::fmt` C-bug Category: This is a bug. I-ICE Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️ T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#138811 opened Mar 21, 2025 by thaliaarchi
1
Experiment: New format_args!() representation A-fmt Area: `core::fmt` perf-regression Performance regression. S-experimental Status: Ongoing experiment that does not require reviewing and won't be merged in its current state. S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. T-libs Relevant to the library team, which will review and decide on the PR/issue.
#137294 opened Feb 19, 2025 by m-ou-se • Draft
@m-ou-se
14
Identifiers with combining characters do not work as captured identifiers in println! format strings A-fmt Area: `core::fmt` A-proc-macros Area: Procedural macros A-Unicode Area: Unicode C-bug Category: This is a bug. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. T-libs-api Relevant to the library API team, which will review and decide on the PR/issue.
#137063 opened Feb 15, 2025 by interactive-toast
2
Tracking issue for release notes of #136932: Reduce formatting width and precision to 16 bits A-fmt Area: `core::fmt` relnotes Marks issues that should be documented in the release notes of the next release. relnotes-tracking-issue Marks issues tracking what text to put in release notes. T-libs Relevant to the library team, which will review and decide on the PR/issue. T-libs-api Relevant to the library API team, which will review and decide on the PR/issue.
#137014 opened Feb 14, 2025 by rustbot
3 tasks
1.87.0
dbg! prints can tear in multi-threading code A-fmt Area: `core::fmt` C-bug Category: This is a bug. T-libs Relevant to the library team, which will review and decide on the PR/issue. WG-debugging Working group: Bad Rust debugging experiences
#136703 opened Feb 7, 2025 by orlp
Path/OsStr incorrectly handle Formatter flags A-fmt Area: `core::fmt` C-bug Category: This is a bug. T-libs Relevant to the library team, which will review and decide on the PR/issue.
#136617 opened Feb 6, 2025 by thaliaarchi
1
@thaliaarchi
2
Integer to_string is slow A-fmt Area: `core::fmt` C-optimization Category: An issue highlighting optimization opportunities or PRs implementing such
#135543 opened Jan 15, 2025 by jh05013
4
absent precision parameter for floating point format string is undocumented A-docs Area: Documentation for any part of the project, including the compiler, standard library, and tools A-floating-point Area: Floating point numbers and arithmetic A-fmt Area: `core::fmt` C-bug Category: This is a bug. T-libs Relevant to the library team, which will review and decide on the PR/issue.
#131159 opened Oct 2, 2024 by e00E
1
1
Decimal formatting for some floating point numbers does not round-to-even A-floating-point Area: Floating point numbers and arithmetic A-fmt Area: `core::fmt` C-bug Category: This is a bug. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. T-libs Relevant to the library team, which will review and decide on the PR/issue.
#130936 opened Sep 27, 2024 by gregates
8
generated call to core::fmt::Arguments::new_const fails to constant fold A-fmt Area: `core::fmt` C-optimization Category: An issue highlighting optimization opportunities or PRs implementing such T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#128709 opened Aug 5, 2024 by lolbinarycat
1
5
Inconsistent format string support for binary and hex representations of arrays A-diagnostics Area: Messages for errors, warnings, and lints A-fmt Area: `core::fmt` C-bug Category: This is a bug. D-papercut Diagnostics: An error or lint that needs small tweaks. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#119300 opened Dec 25, 2023 by ChaiTRex
1
Cannot round trip parsing -1 as non-decimal A-fmt Area: `core::fmt` C-bug Category: This is a bug. C-feature-request Category: A feature request, i.e: not implemented / a PR. T-libs-api Relevant to the library API team, which will review and decide on the PR/issue.
#115545 opened Sep 4, 2023 by Shadow53
2
Tracking Issue for std::fmt::Arguments::from_str A-fmt Area: `core::fmt` C-tracking-issue Category: An issue tracking the progress of sth. like the implementation of an RFC T-libs-api Relevant to the library API team, which will review and decide on the PR/issue.
#115352 opened Aug 29, 2023 by m-ou-se
3 tasks
OsString Debug implementation prints escaped single quotes A-fmt Area: `core::fmt` T-libs Relevant to the library team, which will review and decide on the PR/issue.
#114583 opened Aug 7, 2023 by tamird
1
Using &v instead of v arg in format! does not inline, causing ~6% perf hit A-codegen Area: Code generation A-fmt Area: `core::fmt` C-bug Category: This is a bug. C-optimization Category: An issue highlighting optimization opportunities or PRs implementing such I-slow Issue: Problems and improvements with respect to performance of generated code. T-libs Relevant to the library team, which will review and decide on the PR/issue.
#112156 opened Jun 1, 2023 by nyurik
4
Flatten bool arguments under -Zflatten-format-args=yes A-fmt Area: `core::fmt` C-optimization Category: An issue highlighting optimization opportunities or PRs implementing such I-slow Issue: Problems and improvements with respect to performance of generated code. T-libs Relevant to the library team, which will review and decide on the PR/issue.
#111995 opened May 26, 2023 by KisaragiEffective
@m-ou-se
1
bad diagnostic suggestion for self access in a format string A-diagnostics Area: Messages for errors, warnings, and lints A-fmt Area: `core::fmt` A-macros Area: All kinds of macros (custom derive, macro_rules!, proc macros, ..) A-resolve Area: Name/path resolution done by `rustc_resolve` specifically A-suggestion-diagnostics Area: Suggestions generated by the compiler applied by `cargo fix` D-invalid-suggestion Diagnostics: A structured suggestion resulting in incorrect code. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#105520 opened Dec 10, 2022 by ehuss
4
Tracking Issue for simple_fmt A-fmt Area: `core::fmt` C-tracking-issue Category: An issue tracking the progress of sth. like the implementation of an RFC T-libs-api Relevant to the library API team, which will review and decide on the PR/issue.
#105054 opened Nov 29, 2022 by m-ou-se
6 tasks
Using the format!() macro with an async function makes the whole Future non-Send A-fmt Area: `core::fmt` C-bug Category: This is a bug. E-easy Call for participation: Easy difficulty. Experience needed to fix: Not much. Good first issue. E-needs-test Call for participation: An issue has been fixed and does not reproduce, but no test has been added. T-libs Relevant to the library team, which will review and decide on the PR/issue.
#101650 opened Sep 10, 2022 by Hocuri
5
Tracking issue for improving std::fmt::Arguments and format_args!() A-fmt Area: `core::fmt` C-tracking-issue Category: An issue tracking the progress of sth. like the implementation of an RFC I-heavy Issue: Problems and improvements with respect to binary size of generated code. I-slow Issue: Problems and improvements with respect to performance of generated code. T-libs Relevant to the library team, which will review and decide on the PR/issue.
#99012 opened Jul 7, 2022 by m-ou-se
40 of 50 tasks
@m-ou-se
32
stmt_expr_attributes attempts to parse a simple doc-comment A-diagnostics Area: Messages for errors, warnings, and lints A-fmt Area: `core::fmt` A-macros Area: All kinds of macros (custom derive, macro_rules!, proc macros, ..) D-terse Diagnostics: An error or lint that doesn't give enough information about the problem at hand. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#98063 opened Jun 13, 2022 by ckiee
specified formatting not applied if format_args() is passed to println!() A-fmt Area: `core::fmt` C-bug Category: This is a bug. T-libs Relevant to the library team, which will review and decide on the PR/issue.
#97797 opened Jun 6, 2022 by matthiaskrgr
6
Range's Debug implementation misbehaves with formatting A-fmt Area: `core::fmt` C-bug Category: This is a bug. T-libs Relevant to the library team, which will review and decide on the PR/issue.
#90240 opened Oct 24, 2021 by JaniM
write! generate longer assembly compared to format! A-fmt Area: `core::fmt` C-optimization Category: An issue highlighting optimization opportunities or PRs implementing such I-heavy Issue: Problems and improvements with respect to binary size of generated code. I-slow Issue: Problems and improvements with respect to performance of generated code. T-libs Relevant to the library team, which will review and decide on the PR/issue.
#82508 opened Feb 25, 2021 by pickfire
12
ProTip! Exclude everything labeled bug with -label:bug.