clippy::redundant_at_rest_pattern: using a rest pattern to bind an entire slice to a local

What you see

warning: using a rest pattern to bind an entire slice to a local
 --> main.rs:3:8
  |
3 | if let [all @ ..] = &*v {
  |        ^^^^^^^^^^ help: this is better represented with just the binding: `all`
  |
  = help: for further information visit https://rust-lang.github.io/rust-clippy/stable/index.html#redundant_at_rest_pattern
  = note: `#[warn(clippy::redundant_at_rest_pattern)]` on by default

Real output of Clippy 0.1.99 (Rust 1.99) on the example below. Names and line numbers in yours will differ.

Does it matter?

In all cases, all works fine and can often make code simpler, as you possibly won’t need to convert from say a Vec to a slice by dereferencing.

Code that does something simple in a complicated way. Warns by default.

How to fix it

Clippy can fix this one for you: run cargo clippy --fix (add --allow-dirty if you have uncommitted changes). Review the diff before you commit.

Flagged

if let [all @ ..] = &*v {
    // NOTE: Type is a slice here
    println!("all elements: {all:#?}");
}

Write this instead

if let all = v {
    // NOTE: Type is a `Vec` here
    println!("all elements: {all:#?}");
}
// or
println!("all elements: {v:#?}");

Turn it off, or on

Allow it where it does not fit your code, as narrowly as you can:

#[allow(clippy::redundant_at_rest_pattern)]
fn my_function() { /* ... */ }

[lints.clippy]
redundant_at_rest_pattern = "allow"

cargo clippy -- -A clippy::redundant-at-rest-pattern

The [lints] table needs Rust 1.74 or newer. In a workspace, put it under [workspace.lints.clippy] and add [lints] workspace = true to each member.