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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)]`

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

Using <code>${index()}</code> inside <code>${concat()}</code> fails with "expected identifier or string literal" error

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

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

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)]`

T-langRelevant to the language teamRelevant to the language team

Status: Open.

#138181 In rust-lang/rust;

· MonterraByte opened on Mar 7, 2025

Decide what we want about <code>macro_metavar_expr</code>

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

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

I-lang-radarItems that are on lang's radar and will need eventual work or consideration.Items that are on lang's radar and will need eventual work or consideration.

T-langRelevant to the language teamRelevant to the language team

Status: Open.

#137581 In rust-lang/rust;

· traviscross opened on Feb 25, 2025

<code>${count()}</code> disregards depth parameter when captured repetition is empty

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

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

requires-nightlyThis issue requires a nightly compiler in some way.This issue requires a nightly compiler in some way.

Status: Open.

#111905 In rust-lang/rust;

· lowr opened on May 24, 2023

<code>meta_variable_misuse</code> trips on <code>${count($foo)}</code> outside of a repetition

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

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

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.

#109245 In rust-lang/rust;

· PatchMixolydic opened on Mar 17, 2023

Confusing error when metavariable expressions are used outside of reptitions

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

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

requires-nightlyThis issue requires a nightly compiler in some way.This issue requires a nightly compiler in some way.

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.

#96535 In rust-lang/rust;

· repnop opened on Apr 28, 2022

Tracking Issue for RFC 3086: macro metavariable expressions

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

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

S-tracking-design-concernsStatus: There are blocking design concerns.Status: There are blocking design concerns.

T-langRelevant to the language teamRelevant to the language team

Status: Open.

#83527 In rust-lang/rust;

· nikomatsakis opened on Mar 26, 2021