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Tracking Issue for RFC 3698 "Declarative <code>macro_rules!</code> derive macros" (<code>macro_derive</code>)

A-macrosArea: All kinds of macros (custom derive, macro_rules!, proc macros, ..)Area: All kinds of macros (custom derive, macro_rules!, proc macros, ..)

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

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

Status: Open.

#143549 In rust-lang/rust;

· joshtriplett opened on Jul 6, 2025

Tracking Issue for RFC 3697 "Declarative <code>macro_rules!</code> attribute macros" (<code>macro_attr</code>)

A-macrosArea: All kinds of macros (custom derive, macro_rules!, proc macros, ..)Area: All kinds of macros (custom derive, macro_rules!, proc macros, ..)

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

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

Status: Open.

#143547 In rust-lang/rust;

· joshtriplett opened on Jul 6, 2025

<code>autodiff</code> does not have correct hygiene information; “cannot find value” produced if expanded by macro

A-macrosArea: All kinds of macros (custom derive, macro_rules!, proc macros, ..)Area: All kinds of macros (custom derive, macro_rules!, proc macros, ..)

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

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

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.

#143543 In rust-lang/rust;

· SabrinaJewson opened on Jul 6, 2025

a path fragment cannot begin a struct expression or macro call expression

A-macrosArea: All kinds of macros (custom derive, macro_rules!, proc macros, ..)Area: All kinds of macros (custom derive, macro_rules!, proc macros, ..)

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

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.

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.

#143221 In rust-lang/rust;

· sodiboo opened on Jun 30, 2025

Tracking Issue for <code>macro_named_capture_groups</code>

A-macrosArea: All kinds of macros (custom derive, macro_rules!, proc macros, ..)Area: All kinds of macros (custom derive, macro_rules!, proc macros, ..)

B-experimentalBlocker: In-tree experiment; RFC pending, not yet approved or unneeded (requires FCP to stabilize).Blocker: In-tree experiment; RFC pending, not yet approved or unneeded (requires FCP to stabilize).

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

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

Status: Open.

#142999 In rust-lang/rust;

· tgross35 opened on Jun 25, 2025

Incorrect suggestion for incompatible match arm types

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

A-macrosArea: All kinds of macros (custom derive, macro_rules!, proc macros, ..)Area: All kinds of macros (custom derive, macro_rules!, proc macros, ..)

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.

#142359 In rust-lang/rust;

· jjl9807 opened on Jun 11, 2025

Baffling suggestion labelled "help: try introducing a local generic parameter here"

A-const-genericsArea: const generics (parameters and arguments)Area: const generics (parameters and arguments)

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

A-macrosArea: All kinds of macros (custom derive, macro_rules!, proc macros, ..)Area: All kinds of macros (custom derive, macro_rules!, proc macros, ..)

D-confusingDiagnostics: Confusing error or lint that should be reworked.Diagnostics: Confusing error or lint that should be reworked.

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

E-needs-mcveCall for participation: This issue has a repro, but needs a Minimal Complete and Verifiable ExampleCall for participation: This issue has a repro, but needs a Minimal Complete and Verifiable Example

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.

#141872 In rust-lang/rust;

· nabijaczleweli opened on Jun 1, 2025

<code>file!()</code> returns incorrect <code>Path</code>s on WASM target built on Windows.

A-macrosArea: All kinds of macros (custom derive, macro_rules!, proc macros, ..)Area: All kinds of macros (custom derive, macro_rules!, proc macros, ..)

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.

Status: Open.

#140883 In rust-lang/rust;

· andriyDev opened on May 10, 2025

ICE: expand: unimplemented

A-macrosArea: All kinds of macros (custom derive, macro_rules!, proc macros, ..)Area: All kinds of macros (custom derive, macro_rules!, proc macros, ..)

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

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

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

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

S-bug-has-testStatus: This bug is tracked inside the repo by a `known-bug` test.Status: This bug is tracked inside the repo by a `known-bug` test.

S-has-bisectionStatus: A bisection has been found for this issueStatus: A bisection has been found for this issue

S-has-mcveStatus: A Minimal Complete and Verifiable Example has been found for this issueStatus: A Minimal Complete and Verifiable Example has been found for this issue

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.

#140479 In rust-lang/rust;

· matthiaskrgr opened on Apr 29, 2025

Add support for repetition to <code>proc_macro::quote</code>

A-macrosArea: All kinds of macros (custom derive, macro_rules!, proc macros, ..)Area: All kinds of macros (custom derive, macro_rules!, proc macros, ..)

A-proc-macrosArea: Procedural macrosArea: Procedural macros

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

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

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

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-macrosWorking group: MacrosWorking group: Macros

Status: Open.

#140238 In rust-lang/rust;

· tgross35 opened on Apr 24, 2025

<code>cargo fix --edition</code> failed: <code>error: expected item after attributes</code>

A-edition-2024Area: The 2024 editionArea: The 2024 edition

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-macrosArea: All kinds of macros (custom derive, macro_rules!, proc macros, ..)Area: All kinds of macros (custom derive, macro_rules!, proc macros, ..)

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

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

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

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.

#139567 In rust-lang/rust;

· eval-exec opened on Apr 9, 2025

Creeping macro expansion - possible exponential time?

A-macrosArea: All kinds of macros (custom derive, macro_rules!, proc macros, ..)Area: All kinds of macros (custom derive, macro_rules!, proc macros, ..)

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

E-needs-mcveCall for participation: This issue has a repro, but needs a Minimal Complete and Verifiable ExampleCall for participation: This issue has a repro, but needs a Minimal Complete and Verifiable Example

I-hangIssue: The compiler never terminates, due to infinite loops, deadlock, livelock, etc.Issue: The compiler never terminates, due to infinite loops, deadlock, livelock, etc.

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.

#139306 In rust-lang/rust;

· matthiasbeyer opened on Apr 3, 2025