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Clippy lints / Correctness

Clippy lint · Correctness · checked with Clippy 0.1.99

clippy::iter_skip_zero: usage of `.skip(0)`

What it meansChecks for usage of .skip(0) on iterators. It is in the correctness group and denied by default (the build fails).

What you see

error: usage of `.skip(0)`
 --> main.rs:4:23
  |
4 | let x = v.iter().skip(0).collect::<Vec<_>>();
  |                       ^ help: if you meant to skip the first element, use: `1`
  |
  = note: this call to `skip` does nothing and is useless; remove it
  = help: for further information visit https://rust-lang.github.io/rust-clippy/stable/index.html#iter_skip_zero
  = note: `#[deny(clippy::iter_skip_zero)]` 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?

This was likely intended to be .skip(1) to skip the first element, as .skip(0) does nothing. If not, the call should be removed.

Code that is almost certainly wrong. Denied by default: the build fails until you fix it or allow it.

How to fix it

Clippy does not fix this one automatically (its suggestion may change behaviour, so it only shows it). Change the code by hand:

Flagged

let v = vec![1, 2, 3];
let x = v.iter().skip(0).collect::<Vec<_>>();
let y = v.iter().collect::<Vec<_>>();
assert_eq!(x, y);

Turn it off, or on

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

On one item

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

Whole crate (Cargo.toml)

[lints.clippy]
iter_skip_zero = "allow"

One run

cargo clippy -- -A clippy::iter-skip-zero

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.

Correctnessgroup
denydefault level
nofixed by cargo clippy --fix
1.73.0added in Rust

Clippy's own documentation

What it does

Checks for usage of .skip(0) on iterators.

Why is this bad?

This was likely intended to be .skip(1) to skip the first element, as .skip(0) does nothing. If not, the call should be removed.

Example

let v = vec![1, 2, 3];
let x = v.iter().skip(0).collect::<Vec<_>>();
let y = v.iter().collect::<Vec<_>>();
assert_eq!(x, y);

From the Clippy lint list (0.1.99), part of the Rust project, MIT or Apache-2.0. Official entry.

Related lints

All 847 Clippy lints · Rust compiler errors · Cargo.toml checker

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