macro_metavar_expr_concat: explain why idents are invalid#155757
Merged
rust-bors[bot] merged 1 commit intorust-lang:mainfrom Apr 26, 2026
Merged
macro_metavar_expr_concat: explain why idents are invalid#155757rust-bors[bot] merged 1 commit intorust-lang:mainfrom
rust-bors[bot] merged 1 commit intorust-lang:mainfrom
Conversation
rustbot
added
S-waiting-on-review
Collaborator
|
r? @TaKO8Ki rustbot has assigned @TaKO8Ki. Use Why was this reviewer chosen?The reviewer was selected based on:
|
Kivooeo
approved these changes
Apr 24, 2026
| pub(crate) enum InvalidIdentReason { | ||
| #[note(r#"this `${"{"}concat(..){"}"}` invocation generated an empty ident"#)] | ||
| Empty, | ||
| #[note(r#"this `${"{"}concat(..){"}"}` invocation generated `{$symbol}`, but {$start} is not either '_' or XID_Start"#)] |
Member
There was a problem hiding this comment.
Suggested change
| #[note(r#"this `${"{"}concat(..){"}"}` invocation generated `{$symbol}`, but {$start} is not either '_' or XID_Start"#)] | |
| #[note(r#"this `${"{"}concat(..){"}"}` invocation generated `{$symbol}`, but {$start} is not '_' and does not have property XID_Start"#)] |
on your taste
Suggested change
| #[note(r#"this `${"{"}concat(..){"}"}` invocation generated `{$symbol}`, but {$start} is not either '_' or XID_Start"#)] | |
| #[note(r#"this `${"{"}concat(..){"}"}` invocation generated `{$symbol}`, but {$start} is neither '_' nor XID_Start"#)] |
Contributor
Author
|
@bors r=Kivooeo |
Contributor
rust-bors
Bot
added
S-waiting-on-bors
JonathanBrouwer
added a commit
to JonathanBrouwer/rust
that referenced
this pull request
Apr 26, 2026
macro_metavar_expr_concat: explain why idents are invalid Recently I've been playing around with `macro_metavar_expr_concat` and in the process wasted more time than I'd have liked on debugging my dodgy idents. This should make that experience much nicer going forward.
rust-bors Bot
pushed a commit
that referenced
this pull request
Apr 26, 2026
…uwer Rollup of 15 pull requests Successful merges: - #152995 (ACP Implementation of PermissionsExt for Windows ) - #153457 (prevent deref coercions in `pin!`) - #155250 (Windows: Cache the pipe filesystem handle) - #155574 (Move `std::io::RawOsError` to `core::io`) - #155757 (macro_metavar_expr_concat: explain why idents are invalid) - #155823 (miri subtree update) - #155693 (Suggest enclosing format string with `""` under special cases) - #155707 (Fix minor panic-unsoundness in CString::clone_into) - #155719 (Suggest `.iter()` for shared projections) - #155779 (ssa_range_prop: use `if let` guards) - #155789 (Cleanups to `AttributeExt`) - #155805 (Mention `DEPRECATED_LLVM_INTRINSIC` lint for internal use) - #155806 (Remove the incomplete marker from `impl` restrictions) - #155820 (Avoid improper spans when `...` or `..=` is recovered from non-ASCII) - #155822 (Add default field values to diagnostic FormatArgs)
rust-timer
added a commit
that referenced
this pull request
Apr 26, 2026
Rollup merge of #155757 - mejrs:ident_help, r=Kivooeo macro_metavar_expr_concat: explain why idents are invalid Recently I've been playing around with `macro_metavar_expr_concat` and in the process wasted more time than I'd have liked on debugging my dodgy idents. This should make that experience much nicer going forward.
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
4 participants
Add this suggestion to a batch that can be applied as a single commit.This suggestion is invalid because no changes were made to the code.Suggestions cannot be applied while the pull request is closed.Suggestions cannot be applied while viewing a subset of changes.Only one suggestion per line can be applied in a batch.Add this suggestion to a batch that can be applied as a single commit.Applying suggestions on deleted lines is not supported.You must change the existing code in this line in order to create a valid suggestion.Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be applied on multi-line comments.Suggestions cannot be applied while the pull request is queued to merge.Suggestion cannot be applied right now. Please check back later.
Recently I've been playing around with
macro_metavar_expr_concatand in the process wasted more time than I'd have liked on debugging my dodgy idents. This should make that experience much nicer going forward.