Unclear message for comments with trailing spaces
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C-feature-request
P-low
- Dominant language
- Rust
- Stars
- 7k
- Forks
- 1.1k
- Avg merge
- 2d 13h
- Merged PRs (30d)
- 24
Description
When a comment ends with a trailing whitespace, cargo fmt --check gives an unclear error message.
fn main() {
// Comment with trailing whitespace
println!("Hello world");
}
Error message:
output of rustfmt -V on my machine: rustfmt 1.8.0-nightly (b48576b4db 2025-03-22)
I think there are Unicode characters that can be used to represent unwanted spaces, like U+2423, U+23B5 or U+25AF
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start with the provided Rust reproducer and run cargo fmt --check or rustfmt on the snippet to inspect the current diagnostic. The work is done when trailing whitespace in a comment produces a clear indication of the unwanted character or its location.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- rust
- Domain
- tooling
- Issue type
- Bug
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 38/100