Rustfmt deletes leading non-breaking space from comments
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Description
This came up in https://github.com/rust-lang/rust/issues/106098#issuecomment-1364374483.
The 2 possible behaviors that seem reasonable to me are either:
- keep the non-breaking space characters as is; or
- replace non-breaking space (U+00A0) with ordinary space (U+0020) inside of comments.
The current behavior is not a way that I would expect rustfmt to behave.
Repro:
$ echo -e '/*\n normal spaces\n\u00a0\u00a0non-breaking\u00a0spaces\n*/' | rustfmt
/*
normal spaces
non-breaking spaces
*/
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 by running the reproduction command from the issue and compare how ordinary spaces and U+00A0 are handled in comments. Trace the comment-formatting path and add a regression test covering the leading non-breaking spaces. Done means the project has a defined, tested behavior: either preserving U+00A0 or replacing it with ordinary spaces.
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
- 45/100