Non-idempotent formatting for empty statment.
Open
Nobody has claimed this yet.
A-statements
C-bug
I-non-idempotency
- Dominant language
- Rust
- Stars
- 7k
- Forks
- 1.1k
- Avg merge
- 2d 13h
- Merged PRs (30d)
- 24
Description
Input code:
fn format_this() {
let foo = {;()};
}
After first format:
fn format_this() {
let foo = {
()
};
}
After second format:
fn format_this() {
let foo = { () };
}
Observed on play.rust-lang.org using 1.8.0-nightly (2026-02-03 366a1b93e7). link
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
Reproduce the example in the linked play.rust-lang.org session using the reported nightly toolchain and format the input twice. Trace the rustfmt formatting path for an empty statement inside a block, then add or update coverage for the example. Done means formatting the result repeatedly produces identical output.
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