rust-lang / rust-lang/rustfmt

"left behind trailing whitespace" when breaking after visibility of a field

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A-visibility C-bug I-trailing-whitespace
Dominant language
Rust
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Avg merge
2d 13h
Merged PRs (30d)
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Description

$ rustup run nightly cargo fmt -- --check
Diff in /home/jplatte/code/matrix-rust-sdk/crates/matrix-sdk/src/room/timeline/event_item/content.rs at line 292:
 /// of the sender of the reaction.
 #[derive(Clone, Debug, Default)]
 pub struct ReactionGroup(
-    pub(in crate::room::timeline)
+    pub(in crate::room::timeline) 
         IndexMap<(Option<OwnedTransactionId>, Option<OwnedEventId>), OwnedUserId>,
 );
 
error[internal]: left behind trailing whitespace
   --> /home/jplatte/code/matrix-rust-sdk/crates/matrix-sdk/src/room/timeline/event_item/content.rs:295:295:34
    |
295 |     pub(in crate::room::timeline) 
    |                                  ^
    |

Contributor guide

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First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start with the reported reproduction command, rustup run nightly cargo fmt -- --check, and inspect crates/matrix-sdk/src/room/timeline/event_item/content.rs around line 292. Trace how rustfmt handles a field visibility modifier followed by a line break, then add coverage for the shown case and confirm the check no longer reports trailing whitespace.

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
35/100

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