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ICE when using the new ${concat()} meta

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

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) ❄️

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.

#143819 In rust-lang/rust;

· linkmauve opened on Jul 11, 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

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

Macro metavar expr concat doesn't work with nested repetitions

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_concat`#![feature(macro_metavar_expr_concat)]``#![feature(macro_metavar_expr_concat)]`

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.

#127723 In rust-lang/rust;

· Noratrieb opened on Jul 14, 2024

Tracking Issue for <code>macro_metavar_expr_concat</code>

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

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

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.

#124225 In rust-lang/rust;

· c410-f3r opened on Apr 21, 2024