False positive for `clippy::needless_borrows_for_generic_args`?

⚓ Rust    📅 2026-02-08    👤 surdeus    👁️ 7      

surdeus

I have an example on the playground: Rust Playground

When I run Clippy on it, I get:

warning: the borrowed expression implements the required traits

with this suggestion:

10 |     process(&mut data);
   |             ^^^^^^^^^ help: change this to: `data`

However, data is a built-in array and removing &mut would copy it instead of making the intended mutation to the original data. I would say that's not a good suggestion.

So is this a false positive?
Or am I doing something wrong?

If it is a false positive, I can create an issue, but I wanted to check here first if I'm understanding it correctly.

And a follow-up question: Is there a way to change my function signature to somehow disallow unintentionally calling it with a copy of an array (but at the same time still allow the chunks_mut() use case I mentioned in the playground example)?

1 post - 1 participant

Read full topic

🏷️ Rust_feed